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134 results on '"Hu, Shigang"'

5. Strong red upconversion luminescence of NaYF4: Yb3+, Er3+ through Sc3+ ions doping for temperature sensing.

Author

Kou, Chen, Duan, Bin, Shi, Lichun, Yang, Hongcai, Ni, Heng, Wang, Haiyuan, Ye, Qing, Hu, Junshan, and Hu, Shigang

Subjects
RED light, OPTICAL measurements, PHOTON upconversion, SPECTRUM analysis, DECOMPOSITION method
Abstract

The Sc3+ ions doped NaYF4: Yb3+, Er3+ upconversion (UC) nanoparticles are synthesized by thermal decomposition method. We successfully obtained the upconversion luminescence (UCL) nanoparticles from green emission to red emission through doping Sc3+ ions with different concentrations. Based on the XRD, the phase change process of Sc3+ ions doped NaYF4 nanocrystalline phase were demonstrated. More importantly, through the analysis of UC spectrum data, the change in the phase of the NaY/ScF4: Yb3+, Er3+ nanocrystalline corresponds to the change in its luminous properties. It determines that the change of crystal field will lead to the change of luminescence, and then modulate the luminescence. NaScF4: Yb3+, Er3+ UC nanoparticles exhibit strong red light emission. In addition, the temperature-sensitive properties of the optimal doping concentration of Sc3+ ion were tested. The sensitivity of NaYF4: Yb3+, Er3+ nanoparticles doped with Sc3+ ion reached the maximum value of 0.024 K− 1 at 498 K. The nanocrystalline has great application value in the fields of optical temperature measurement, biomedicine, bioprobes and colorful display. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Research and Design of Smart Home System Based on Cloud Computing

Author

Cao, Huiyi, Hu, Shigang, Wu, Qingyang, Tang, Zhijun, Li, Jin, Wu, Xiaofeng, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, Xhafa, Fatos, editor, Patnaik, Srikanta, editor, and Zomaya, Albert Y., editor

Published
2018
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13. Comparative Analysis of Different Techniques for Image Fusion

Author

Hu, Shigang, Cao, Huiyi, Wu, Xiaofeng, Wu, Qingyang, Tang, Zhijun, Liu, Yunxin, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, Xhafa, Fatos, editor, Patnaik, Srikanta, editor, and Yu, Zhengtao, editor

Published
2017
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42. Effect of substrate bias on negative bias temperature instability of ultra-deep sub-micro p-channel metal–oxide–semiconductor field-effect transistors

Author

Ma Xiao-Hua, Cao Yan-Rong, Hu Shigang, and Hao Yue

Subjects
Negative-bias temperature instability, Materials science, business.industry, Oxide, General Physics and Astronomy, Substrate (electronics), Electron, Stress (mechanics), Impact ionization, chemistry.chemical_compound, chemistry, Optoelectronics, Degradation (geology), Field-effect transistor, business
Abstract

The effect of substrate bias on the degradation during applying a negative bias temperature (NBT) stress is studied in this paper. With a smaller gate voltage stress applied, the degradation of negative bias temperature instability (NBTI) is enhanced, and there comes forth an inflexion point. The degradation pace turns larger when the substrate bias is higher than the inflexion point. The substrate hot holes can be injected into oxide and generate additional oxide traps, inducing an inflexion phenomenon. When a constant substrate bias stress is applied, as the gate voltage stress increases, an inflexion comes into being also. The higher gate voltage causes the electrons to tunnel into the substrate from the poly, thereby generating the electron–hole pairs by impact ionization. The holes generated by impact ionization and the holes from the substrate all can be accelerated to high energies by the substrate bias. More additional oxide traps can be produced, and correspondingly, the degradation is strengthened by the substrate bias. The results of the alternate stress experiment show that the interface traps generated by the hot holes cannot be annealed, which is different from those generated by common holes.

Published
2009
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48. Upconversion core/shell nanoparticles with lowered surface quenching for fluorescence detection of Hg2+ ions.

Author

Shi, Lichun, Hu, Junshan, Wu, Xiaofeng, Zhan, Shiping, Hu, Shigang, Tang, Zhijun, Chen, Mingshu, and Liu, Yunxin

Subjects
NANOPARTICLES, RUTHENIUM, FLUORESCENCE resonance energy transfer
Abstract

In this study, we reported a fluorescent nanoprobe assembled with upconversion core/shell nanoparticles and a chromophore ruthenium complex (N719@UCNPs). Functional groups (NCS) of the ruthenium complex N719 could react with Hg2+, which made N719 lose the efficacy in quenching the fluorescence of upconversion nanoparticles (UCNPs) and resulted in the recovery of the fluorescence intensity of UCNPs eventually. This fluorescent nanoprobe could provide a rapid and efficient detection of Hg2+ ions in vivo based on the fluorescence resonance energy transfer (FRET) between UCNPs and N719, and a detection limit of 0.1 μg mL−1 can be achieved based on this nanoprobe. It's worth mentioning that, compared with bare core upconversion nanoparticles, the core/shell UCNPs could greatly reduce the surface quenching of the fluorescence induced by solvents instead of N719, thus leading to the enhancement of signal-to-noise ratios. Moreover, the excitation of core/shell UCNPs requires a much lower power (0.06 W cm−2) than that of bare cores, which is beneficial for reducing the decomposition of N719 to stabilize the FRET processes. [ABSTRACT FROM AUTHOR]

Published
2018
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49. Tracing of dye molecules in living plants through NaGdF4:Yb3+,Er3+fluorescent nanoprobes

Author

Wu, Xiaofeng, Zhang, Ya′nan, Zhan, Shiping, Li, Jin, Nie, Guozheng, Hu, Shigang, Yan, Cong, Wu, Shaobing, Cheng, Shengbin, Hu, Junshan, Shi, Lichun, and Liu, Yunxin

Abstract

In this paper, we demonstrated trace of dye molecules in living plants. The NaGdF4:Yb3+,Er3+nanoparticles probe was used to detect the rhodamine B (RhB) in bean sprout. It is found that the fluorescencedye can be efficiently imbibed during the growing process and the absorbance presented a position dependence effect, which was supported by the upconversion spectra and the fluorescent image characterization. In addition, the concentration of the residual RhB in bean sprout can be efficiently traced by the synthesized probe based on the fluorescent resonant energy transfer. Finally, the relation between the excitation power, concentration and the ratio of yellow to green emission are discussed in detail. These results can be helpful in understanding the RhB dye molecules absorbance process in vegetable growth and provide an efficient way to trace the residual dyes in vivoplant.

Published
2019
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