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37 results on '"Penner, Reginald M."'

1. Moving Electrons Purposefully through Single Molecules and Nanostructures: A Tribute to the Science of Professor Nongjian Tao (1963–2020)

Author

Forzani, Erica S, He, Huixin, Hihath, Joshua, Lindsay, Stuart, Penner, Reginald M, Wang, Shaopeng, and Xu, Bingqian

Subjects
Electrochemistry, Electrons, Humans, Nanostructures, Nanotechnology, Nanoscience & Nanotechnology
Abstract

Electrochemistry intersected nanoscience 25 years ago when it became possible to control the flow of electrons through single molecules and nanostructures. Many surprises and a wealth of understanding were generated by these experiments. Professor Nongjian Tao was among the pioneering scientists who created the methods and technologies for advancing this new frontier. Achieving a deeper understanding of charge transport in molecules and low-dimensional materials was the first priority of his experiments, but he also succeeded in discovering applications in chemical sensing and biosensing for these novel nanoscopic systems. In parallel with this work, the investigation of a range of phenomena using novel optical microscopic methods was a passion of his and his students. This article is a review and an appreciation of some of his many contributions with a view to the future.

Published
2020

2. The 15th Anniversary of the U.S. National Nanotechnology Initiative

Author

Chan, Warren CW, Chhowalla, Manish, Farokhzad, Omid, Glotzer, Sharon, Gogotsi, Yury, Hammond, Paula T, Hersam, Mark C, Javey, Ali, Kagan, Cherie R, Kataoka, Kazunori, Khademhosseini, Ali, Kotov, Nicholas A, Lee, Shuit-Tong, Lee, Young Hee, Li, Yan, Millstone, Jill E, Mulvaney, Paul, Nel, Andre E, Nordlander, Peter J, Parak, Wolfgang J, Penner, Reginald M, Rogach, Andrey L, Schaak, Raymond E, Sood, Ajay K, Stevens, Molly M, Wee, Andrew TS, Weil, Tanja, Willson, C Grant, and Weiss, Paul S

Subjects
Nanoscience & Nanotechnology
Published
2018

4. Diverse Applications of Nanomedicine.

Author

Pelaz, Beatriz, Alexiou, Christoph, Alvarez-Puebla, Ramon A, Alves, Frauke, Andrews, Anne M, Ashraf, Sumaira, Balogh, Lajos P, Ballerini, Laura, Bestetti, Alessandra, Brendel, Cornelia, Bosi, Susanna, Carril, Monica, Chan, Warren CW, Chen, Chunying, Chen, Xiaodong, Chen, Xiaoyuan, Cheng, Zhen, Cui, Daxiang, Du, Jianzhong, Dullin, Christian, Escudero, Alberto, Feliu, Neus, Gao, Mingyuan, George, Michael, Gogotsi, Yury, Grünweller, Arnold, Gu, Zhongwei, Halas, Naomi J, Hampp, Norbert, Hartmann, Roland K, Hersam, Mark C, Hunziker, Patrick, Jian, Ji, Jiang, Xingyu, Jungebluth, Philipp, Kadhiresan, Pranav, Kataoka, Kazunori, Khademhosseini, Ali, Kopeček, Jindřich, Kotov, Nicholas A, Krug, Harald F, Lee, Dong Soo, Lehr, Claus-Michael, Leong, Kam W, Liang, Xing-Jie, Ling Lim, Mei, Liz-Marzán, Luis M, Ma, Xiaowei, Macchiarini, Paolo, Meng, Huan, Möhwald, Helmuth, Mulvaney, Paul, Nel, Andre E, Nie, Shuming, Nordlander, Peter, Okano, Teruo, Oliveira, Jose, Park, Tai Hyun, Penner, Reginald M, Prato, Maurizio, Puntes, Victor, Rotello, Vincent M, Samarakoon, Amila, Schaak, Raymond E, Shen, Youqing, Sjöqvist, Sebastian, Skirtach, Andre G, Soliman, Mahmoud G, Stevens, Molly M, Sung, Hsing-Wen, Tang, Ben Zhong, Tietze, Rainer, Udugama, Buddhisha N, VanEpps, J Scott, Weil, Tanja, Weiss, Paul S, Willner, Itamar, Wu, Yuzhou, Yang, Lily, Yue, Zhao, Zhang, Qian, Zhang, Qiang, Zhang, Xian-En, Zhao, Yuliang, Zhou, Xin, and Parak, Wolfgang J

Subjects
Animals, Humans, Neoplasms, Drug Carriers, Drug Delivery Systems, Particle Size, Nanotechnology, Nanomedicine, Nanoparticles, Bioengineering, Prevention, Biotechnology, 5.1 Pharmaceuticals, Generic Health Relevance, Nanoscience & Nanotechnology
Abstract

The design and use of materials in the nanoscale size range for addressing medical and health-related issues continues to receive increasing interest. Research in nanomedicine spans a multitude of areas, including drug delivery, vaccine development, antibacterial, diagnosis and imaging tools, wearable devices, implants, high-throughput screening platforms, etc. using biological, nonbiological, biomimetic, or hybrid materials. Many of these developments are starting to be translated into viable clinical products. Here, we provide an overview of recent developments in nanomedicine and highlight the current challenges and upcoming opportunities for the field and translation to the clinic.

Published
2017

5. Nanoscience and Nanotechnology Cross Borders.

Author

Khademhosseini, Ali, Chan, Warren WC, Chhowalla, Manish, Glotzer, Sharon C, Gogotsi, Yury, Hafner, Jason H, Hammond, Paula T, Hersam, Mark C, Javey, Ali, Kagan, Cherie R, Kotov, Nicholas A, Lee, Shuit-Tong, Li, Yan, Möhwald, Helmuth, Mulvaney, Paul A, Nel, Andre E, Parak, Wolfgang J, Penner, Reginald M, Rogach, Andrey L, Schaak, Raymond E, Stevens, Molly M, Wee, Andrew TS, Brinker, Jeffrey, Chen, Xiaoyuan, Chi, Lifeng, Crommie, Michael, Dekker, Cees, Farokhzad, Omid, Gerber, Christoph, Ginger, David S, Irvine, Darrell J, Kiessling, Laura L, Kostarelos, Kostas, Landes, Christy, Lee, Takhee, Leggett, Graham J, Liang, Xing-Jie, Liz-Marzán, Luis, Millstone, Jill, Odom, Teri W, Ozcan, Aydogan, Prato, Maurizio, Rao, CNR, Sailor, Michael J, Weiss, Emily, and Weiss, Paul S

Subjects
Nanoscience & Nanotechnology
Published
2017

6. Nanoscience and Nanotechnology Impacting Diverse Fields of Science, Engineering, and Medicine.

Author

Chan, Warren WC, Chhowalla, Manish, Glotzer, Sharon, Gogotsi, Yury, Hafner, Jason H, Hammond, Paula T, Hersam, Mark C, Javey, Ali, Kagan, Cherie R, Khademhosseini, Ali, Kotov, Nicholas A, Lee, Shuit-Tong, Li, Yan, Möhwald, Helmuth, Mulvaney, Paul A, Nel, Andre E, Nordlander, Peter J, Parak, Wolfgang J, Penner, Reginald M, Rogach, Andrey L, Schaak, Raymond E, Stevens, Molly M, Wee, Andrew TS, Willson, C Grant, Fernandez, Laura E, and Weiss, Paul S

Subjects
Nanoscience & Nanotechnology
Published
2016

7. Nano Day: Celebrating the Next Decade of Nanoscience and Nanotechnology.

Author

Kagan, Cherie R, Fernandez, Laura E, Gogotsi, Yury, Hammond, Paula T, Hersam, Mark C, Nel, André E, Penner, Reginald M, Willson, C Grant, and Weiss, Paul S

Subjects
Nanotechnology, Bioengineering, Nanoscience & Nanotechnology
Abstract

Nanoscience and nanotechnology are poised to contribute to a wide range of fields, from health and medicine to electronics, energy, security, and more. These contributions come both directly in the form of new materials, interfaces, tools, and even properties as well as indirectly by connecting fields together. We celebrate how far we have come, and here, we look at what is to come over the next decade that will leverage the strong and growing base that we have built in nanoscience and nanotechnology.

Published
2016

8. Grand Plans for Nano

Author

Chan, Warren WC, Glotzer, Sharon, Gogotsi, Yury, Hafner, Jason H, Hammond, Paula T, Hersam, Mark C, Javey, Ali, Kagan, Cherie R, Khademhosseini, Ali, Kotov, Nicholas A, Lee, Shuit-Tong, Möhwald, Helmuth, Mulvaney, Paul A, Nel, Andre E, Nordlander, Peter J, Parak, Wolfgang J, Penner, Reginald M, Rogach, Andrey L, Schaak, Raymond E, Stevens, Molly M, Wee, Andrew TS, Willson, C Grant, Tierney, Heather L, and Weiss, Paul S

Subjects
Nanoscience & Nanotechnology
Published
2015

9. A Year for Nanoscience

Author

Chan, Warren CW, Gogotsi, Yury, Hafner, Jason H, Hammond, Paula T, Hersam, Mark C, Javey, Ali, Kagan, Cherie R, Khademhosseini, Ali, Kotov, Nicholas A, Lee, Shuit-Tong, Möhwald, Helmuth, Mulvaney, Paul A, Nel, Andre E, Nordlander, Peter J, Parak, Wolfgang J, Penner, Reginald M, Rogach, Andrey L, Schaak, Raymond E, Stevens, Molly M, Wee, Andrew TS, Willson, C Grant, and Weiss, Paul S

Subjects
Nanotechnology, Periodicals as Topic, Science, Nanoscience & Nanotechnology
Published
2014

10. Be critical but fair.

Author

Parak, Wolfgang J, Chan, Warren CW, Hafner, Jason H, Hammond, Paula T, Hersam, Mark C, Javey, Ali, Khademhosseini, Ali, Kotov, Nicholas A, Mulvaney, Paul, Nel, Andre E, Nordlander, Peter J, Penner, Reginald M, Rogach, Andrey L, Schaak, Raymond E, Stevens, Molly M, Wee, Andrew TS, Willson, C Grant, and Weiss, Paul S

Subjects
Nanoscience & Nanotechnology
Published
2013

11. Tanks and Truth

Author

Kotov, Nicholas A., primary, Akinwande, Deji, additional, Brinker, C. Jeffrey, additional, Buriak, Jillian M., additional, Chan, Warren C. W., additional, Chen, Xiaodong, additional, Chhowalla, Manish, additional, Chueh, William, additional, Glotzer, Sharon C., additional, Gogotsi, Yury, additional, Hersam, Mark C., additional, Ho, Dean, additional, Hu, Tony, additional, Javey, Ali, additional, Kagan, Cherie R., additional, Kataoka, Kazunori, additional, Kim, Il-Doo, additional, Lee, Shuit-Tong, additional, Lee, Young Hee, additional, Liz-Marzán, Luis M., additional, Millstone, Jill E., additional, Mulvaney, Paul, additional, Nel, Andre E., additional, Nordlander, Peter, additional, Parak, Wolfgang J., additional, Penner, Reginald M., additional, Rogach, Andrey L., additional, Salanne, Mathieu, additional, Schaak, Raymond E., additional, Sood, Ajay K., additional, Stevens, Molly, additional, Tsukruk, Vladimir, additional, Wee, Andrew T. S., additional, Voets, Ilja, additional, Weil, Tanja, additional, and Weiss, Paul S., additional

Published
2022
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12. Growing Contributions of Nano in 2020

Author

Brinker, C. Jeffrey, primary, Buriak, Jillian M., additional, Chan, Warren C. W., additional, Chhowalla, Manish, additional, Glotzer, Sharon C., additional, Gogotsi, Yury, additional, Hammond, Paula T., additional, Hersam, Mark C., additional, Javey, Ali, additional, Kagan, Cherie R., additional, Kataoka, Kazunori, additional, Khademhosseini, Ali, additional, Kim, Il-Doo, additional, Kotov, Nicholas A., additional, Lee, Shuit-Tong, additional, Lee, Young Hee, additional, Li, Yan, additional, Liz-Marzán, Luis M., additional, Millstone, Jill E., additional, Mulvaney, Paul, additional, Nel, Andre E., additional, Nordlander, Peter, additional, Parak, Wolfgang J., additional, Penner, Reginald M., additional, Rogach, Andrey L., additional, Schaak, Raymond E., additional, Sood, A. K., additional, Stevens, Molly M., additional, Wee, Andrew T. S., additional, Weil, Tanja, additional, Wilson, C. Grant, additional, and Weiss, Paul S., additional

Published
2020
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14. Tutorials and Articles on Best Practices

Author

Schaak, Raymond E., primary, Penner, Reginald M., additional, Buriak, Jillian M., additional, Caruso, Frank, additional, Chhowalla, Manish, additional, Gogotsi, Yury, additional, Mulvaney, Paul, additional, Parak, Wolfgang J., additional, and Weiss, Paul S., additional

Published
2020
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15. Electrode Degradation in Lithium-Ion Batteries

Author

Pender, Joshua P., primary, Jha, Gaurav, additional, Youn, Duck Hyun, additional, Ziegler, Joshua M., additional, Andoni, Ilektra, additional, Choi, Eric J., additional, Heller, Adam, additional, Dunn, Bruce S., additional, Weiss, Paul S., additional, Penner, Reginald M., additional, and Mullins, C. Buddie, additional

Published
2020
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16. Helmuth Möhwald (1946–2018)

Author

Parak, Wolfgang J., primary, Chan, Warren W. C., additional, Chhowalla, Manish, additional, Farokhzad, Omid, additional, Glotzer, Sharon, additional, Gogotsi, Yury, additional, Hammond, Paula T., additional, Hersam, Mark C., additional, Javey, Ali, additional, Kagan, Cherie R., additional, Kataoka, Kazunori, additional, Khademhosseini, Ali, additional, Kotov, Nicholas A., additional, Lee, Shuit-Tong, additional, Lee, Young Hee, additional, Li, Yan, additional, Millstone, Jill, additional, Mulvaney, Paul A., additional, Nel, Andre E., additional, Nordlander, Peter J., additional, Penner, Reginald M., additional, Rogach, Andrey L., additional, Schaak, Raymond E., additional, Stevens, Molly M., additional, Wee, Andrew T. S., additional, Willson, C. Grant, additional, and Weiss, Paul S., additional

Published
2018
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18. A Big Year Ahead for Nano in 2018

Author

Chan, Warren W. C., primary, Chhowalla, Manish, additional, Farokhzad, Omid, additional, Glotzer, Sharon, additional, Gogotsi, Yury, additional, Hafner, Jason H., additional, Hammond, Paula T., additional, Hersam, Mark C., additional, Javey, Ali, additional, Kagan, Cherie R., additional, Kataoka, Kazunori, additional, Khademhosseini, Ali, additional, Kotov, Nicholas A., additional, Lee, Shuit-Tong, additional, Li, Yan, additional, Millstone, Jill, additional, Möhwald, Helmuth, additional, Mulvaney, Paul C., additional, Nel, Andre E., additional, Nordlander, Peter J., additional, Parak, Wolfgang J., additional, Penner, Reginald M., additional, Rogach, Andrey L., additional, Schaak, Raymond E., additional, Stevens, Molly M., additional, Wee, Andrew T. S., additional, Willson, C. Grant, additional, Fernandez, Laura E., additional, and Weiss, Paul S., additional

Published
2017
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20. Our First and Next Decades at ACS Nano

Author

Chan, Warren C. W., primary, Chhowalla, Manish, additional, Glotzer, Sharon, additional, Gogotsi, Yury, additional, Hafner, Jason H., additional, Hammond, Paula T., additional, Hersam, Mark C., additional, Javey, Ali, additional, Kagan, Cherie R., additional, Kataoka, Kazunori, additional, Khademhosseini, Ali, additional, Kotov, Nicholas A., additional, Lee, Shuit-Tong, additional, Li, Yan, additional, Möhwald, Helmuth, additional, Mulvaney, Paul, additional, Nel, Andre E., additional, Nordlander, Peter J., additional, Parak, Wolfgang J., additional, Penner, Reginald M., additional, Rogach, Andrey L., additional, Schaak, Raymond E., additional, Stevens, Molly M., additional, Wee, Andrew T. S., additional, Willson, C. Grant, additional, Fernandez, Laura E., additional, and Weiss, Paul S., additional

Published
2017
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23. Exciting Times for Nano

Author

Chan, Warren C. W., primary, Gogotsi, Yury, additional, Hafner, Jason H., additional, Hammond, Paula T., additional, Hersam, Mark C., additional, Javey, Ali, additional, Kagan, Cherie R., additional, Khademhosseini, Ali, additional, Kotov, Nicholas A., additional, Möhwald, Helmuth, additional, Mulvaney, Paul A., additional, Nel, Andre E., additional, Nordlander, Peter J., additional, Parak, Wolfgang J., additional, Penner, Reginald M., additional, Rogach, Andrey L., additional, Schaak, Raymond E., additional, Stevens, Molly M., additional, Wee, Andrew T. S., additional, Willson, C. Grant, additional, and Weiss, Paul S., additional

Published
2013
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25. Correction to ″We Take It Personally″

Author

Bonnell, Dawn A., primary, Buriak, Jillian M., additional, Chan, Warren C. W., additional, Hafner, Jason H., additional, Hammond, Paula T., additional, Hersam, Mark C., additional, Javey, Ali, additional, Kotov, Nicholas A., additional, Nel, Andre E., additional, Nordlander, Peter J., additional, Parak, Wolfgang J., additional, Penner, Reginald M., additional, Rogach, Andrey L., additional, Schaak, Ray E., additional, Stevens, Molly M., additional, Wee, Andrew T. S., additional, Willson, C. Grant, additional, and Weiss, Paul S., additional

Published
2013
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26. We Take It Personally

Author

Bonnell, Dawn A., primary, Buriak, Jillian M., additional, Chan, Warren C. W., additional, Hafner, Jason H., additional, Hammond, Paula T., additional, Hersam, Mark C., additional, Javey, Ali, additional, Kotov, Nicholas A., additional, Nel, Andre E., additional, Nordlander, Peter J., additional, Penner, Reginald M., additional, Rogach, Andrey L., additional, Schaak, Ray E., additional, Stevens, Molly M., additional, Wee, Andrew T. S., additional, Willson, C. Grant, additional, and Weiss, Paul S., additional

Published
2012
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28. Accelerating Palladium Nanowire H2Sensors Using Engineered Nanofiltration

Author

Koo, Won-Tae, Qiao, Shaopeng, Ogata, Alana F., Jha, Gaurav, Jang, Ji-Soo, Chen, Vivian T., Kim, Il-Doo, and Penner, Reginald M.

Abstract

The oxygen, O2, in air interferes with the detection of H2by palladium (Pd)-based H2sensors, including Pd nanowires (NWs), depressing the sensitivity and retarding the response/recovery speed in airrelative to N2or Ar. Here, we describe the preparation of H2sensors in which a nanofiltration layer consisting of a Zn metal–organic framework (MOF) is assembled onto Pd NWs. Polyhedron particles of Zn-based zeolite imidazole framework (ZIF-8) were synthesized on lithographically patterned Pd NWs, leading to the creation of ZIF-8/Pd NW bilayered H2sensors. The ZIF-8 filter has many micropores (0.34 nm for gas diffusion) which allows for the predominant penetration of hydrogen molecules with a kinetic diameter of 0.289 nm, whereas relatively larger gas molecules including oxygen (0.345 nm) and nitrogen (0.364 nm) in air are effectively screened, resulting in superior hydrogen sensing properties. Very importantly, the Pd NWs filtered by ZIF-8 membrane (Pd NWs@ZIF-8) reduced the H2response amplitude slightly (ΔR/R0= 3.5% to 1% of H2versus5.9% for Pd NWs) and showed 20-fold faster recovery (7 s to 1% of H2) and response (10 s to 1% of H2) speed compared to that of pristine Pd NWs (164 s for response and 229 s for recovery to 1% of H2). These outstanding results, which are mainly attributed to the molecular sieving and acceleration effect of ZIF-8 covered on Pd NWs, rank highest in H2sensing speed among room-temperature Pd-based H2sensors.

Published
2017
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35. Nanoscience and Nanotechnology Cross Borders

Author

Yury Gogotsi, Jeffrey Brinker, Takhee Lee, Manishkumar Chhowalla, C. N.R. Rao, Darrell J. Irvine, Wolfgang J. Parak, Ali Khademhosseini, Paula T. Hammond, Xing-Jie Liang, Emily A. Weiss, Warren W.C. Chan, Jill E. Millstone, Andre E. Nel, Molly M. Stevens, Christoph Gerber, Andrey L. Rogach, Graham J. Leggett, Yan Li, David S. Ginger, Maurizio Prato, Kostas Kostarelos, Cherie R. Kagan, Raymond E. Schaak, Andrew T. S. Wee, Sharon C. Glotzer, Luis M. Liz-Marzán, Nicholas A. Kotov, Laura L. Kiessling, Paul S. Weiss, Teri W. Odom, Reginald M. Penner, Michael F. Crommie, Xiaoyuan Chen, Omid C. Farokhzad, Christy Landes, Paul Mulvaney, Cees Dekker, Ali Javey, Michael J. Sailor, Shuit-Tong Lee, Mark C. Hersam, Lifeng Chi, Helmuth Möhwald, Aydogan Ozcan, Jason H. Hafner, Khademhosseini, Ali, Chan, Warren W. C., Chhowalla, Manish, Glotzer, Sharon C., Gogotsi, Yury, Hafner, Jason H., Hammond, Paula T., Hersam, Mark C., Javey, Ali, Kagan, Cherie R., Kotov, Nicholas A., Lee, Shuit Tong, Li, Yan, Möhwald, Helmuth, Mulvaney, Paul A., Nel, Andre E., Parak, Wolfgang J., Penner, Reginald M., Rogach, Andrey L., Schaak, Raymond E., Stevens, Molly M., Wee, Andrew T. S., Brinker, Jeffrey, Chen, Xiaoyuan, Chi, Lifeng, Crommie, Michael, Dekker, Cee, Farokhzad, Omid, Gerber, Christoph, Ginger, David S., Irvine, Darrell J., Kiessling, Laura L., Kostarelos, Kosta, Landes, Christy, Lee, Takhee, Leggett, Graham J., Liang, Xing Jie, Liz Marzán, Lui, Millstone, Jill, Odom, Teri W., Ozcan, Aydogan, Prato, Maurizio, Rao, C. N. R., Sailor, Michael J., Weiss, Emily, and Weiss, Paul S.

Subjects
Materials science, Andrey, Materials Science (all), Engineering (all), Physics and Astronomy (all), General Engineering, General Physics and Astronomy, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, General Materials Science, Nanoscience & Nanotechnology, 0210 nano-technology
Abstract

The recent ExecutiveOrder by President Trump attempting to ban temporarily the citizens of seven countries (Iran, Iraq, Libya, Somalia, Sudan, Syria, and Yemen) from entering the United States is having significant consequences within the country and around the world. The Order poses a threat to the health and vitality of science, barring students and scientists from these countries from traveling to the United States to study or to attend conferences. In preventing those members of the international scientific community from traveling beyond U.S. borders without guaranteed safe return, the Executive Order demeans them; in so doing, it demeans us all. Universities and research communities are especially impacted, as major universities have students and often faculty holding passports from one of these seven countries. This temporary ban would affect refugees fleeing war-torn areas, challenging the long-standing notion that the United States is a safe haven for those fleeing persecution and war in addition to being a magnet for talent from every corner of the world. The pages of this journal reflect the geographic, ethnic, and cultural diversity that underpins great science. The ban impacts domestic and global scientific efforts and communities. Science succeeds through the cooperation between collections of individuals and teams around the world discovering and learning from each other. To ensure rapid scientific progress, open communication and exchange between scientists are essential. As scientists, engineers, and clinicians, we have benefited from open interactions and collaborations with visitors and students from all parts of the world as well as through scientific publications and discussions at scientific meetings.

Published
2017

36. Accelerating Palladium Nanowire H 2 Sensors Using Engineered Nanofiltration.

Author

Koo WT, Qiao S, Ogata AF, Jha G, Jang JS, Chen VT, Kim ID, and Penner RM

Abstract

The oxygen, O 2 , in air interferes with the detection of H 2 by palladium (Pd)-based H 2 sensors, including Pd nanowires (NWs), depressing the sensitivity and retarding the response/recovery speed in air-relative to N 2 or Ar. Here, we describe the preparation of H 2 sensors in which a nanofiltration layer consisting of a Zn metal-organic framework (MOF) is assembled onto Pd NWs. Polyhedron particles of Zn-based zeolite imidazole framework (ZIF-8) were synthesized on lithographically patterned Pd NWs, leading to the creation of ZIF-8/Pd NW bilayered H 2 sensors. The ZIF-8 filter has many micropores (0.34 nm for gas diffusion) which allows for the predominant penetration of hydrogen molecules with a kinetic diameter of 0.289 nm, whereas relatively larger gas molecules including oxygen (0.345 nm) and nitrogen (0.364 nm) in air are effectively screened, resulting in superior hydrogen sensing properties. Very importantly, the Pd NWs filtered by ZIF-8 membrane (Pd NWs@ZIF-8) reduced the H 2 response amplitude slightly (ΔR/R 0 = 3.5% to 1% of H 2 versus 5.9% for Pd NWs) and showed 20-fold faster recovery (7 s to 1% of H 2 ) and response (10 s to 1% of H 2 ) speed compared to that of pristine Pd NWs (164 s for response and 229 s for recovery to 1% of H 2 ). These outstanding results, which are mainly attributed to the molecular sieving and acceleration effect of ZIF-8 covered on Pd NWs, rank highest in H 2 sensing speed among room-temperature Pd-based H 2 sensors.

Published
2017
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37. Catalytically activated palladium@platinum nanowires for accelerated hydrogen gas detection.

Author

Li X, Liu Y, Hemminger JC, and Penner RM

Abstract

Platinum (Pt)-modified palladium (Pd) nanowires (or Pd@Pt nanowires) are prepared with controlled Pt coverage. These Pd@Pt nanowires are used as resistive gas sensors for the detection of hydrogen gas in air, and the influence of the Pt surface layer is assessed. Pd nanowires with dimensions of 40 nm (h) × 100 nm (w) × 50 μm (l) are first prepared using lithographically patterned nanowire electrodeposition. A thin Pt surface layer is electrodeposited conformally onto a Pd nanowire at coverages, θPt, of 0.10 monolayer (ML), 1.0 ML, and 10 ML. X-ray photoelectron spectroscopy coupled with scanning electron microscopy and electrochemical measurements is consistent with a layer-by-layer deposition mode for Pt on the Pd nanowire surface. The resistance of a single Pd@Pt nanowire is measured during the exposure of these nanowires to pulses of hydrogen gas in air at concentrations ranging from 0.05 to 5.0 vol %. Both Pd nanowires and Pd@Pt nanowires show a prompt and reversible increase in resistance upon exposure to H2 in air, caused by the conversion of Pd to more resistive PdHx. Relative to a pure Pd nanowire, the addition of 1.0 ML of Pt to the Pd surface alters the H2 detection properties of Pd@Pt nanowires in two ways. First, the amplitude of the relative resistance change, ΔR/R0, measured at each H2 concentration is reduced at low temperatures (T = 294 and 303 K) and is unaffected at higher temperatures (T = 316, 344, and 376 K). Second, response and recovery rates are both faster at all temperatures in this range and for all H2 concentrations. For higher θPt = 10 ML, sensitivity to H2 is dramatically reduced. For lower θPt = 0.1 ML, no significant influence on sensitivity or the speed of response/recovery is observed.

Published
2015
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