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163. Citizen Science at the Source of the Blue Nile: Promoting Public Participation in Science for Ensuring Food and Water Security in Ethiopia

Author

Dokou, Zoi, primary, Khadim, Fahad Khan, additional, Zhou, Wangchi, additional, Flamig, Zac, additional, Moges, Mamaru, additional, Tilahun, Seifu, additional, Azage, Muluken, additional, Moges, Semu, additional, Li, Baikun, additional, Mellor, Jonathan, additional, Wang, Guiling, additional, Bagtzoglou, Amvrossios, additional, Hong, Yang, additional, and Anagnostou, Emmanouil, additional

Published
2019
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167. From Cu2(OH)3Cl to nanostructured sisal-like Cu(OH)2 and CuO: Synthesis and characterization.

Author

Jia, Wenzhao, Reitz, Eliot, Sun, Hui, Li, Baikun, Zhang, Heng, and Lei, Yu

Subjects
NANOSTRUCTURED materials, X-ray photoelectron spectroscopy, COPPER, X-ray diffraction, NITROGEN absorption & adsorption
Abstract

Cu2(OH)3Cl with an average size of 5–10 μm have been synthesized by a simple hydrothermal reaction with a yield of ∼100%. After the as-prepared Cu2(OH)3Cl was treated with NaOH solution, the green crystals were converted to blue sisal-like Cu(OH)2 with needle-like nanorods pointing out radially from the core. These nanorods were about 100–200 nm in diameter and 10 μm in length. Using the sisal-like Cu(OH)2 as sacrificial precursor, CuO with a well-preserved morphological feature of the precursor was formed through thermal treatment. The samples were characterized by scanning electron microscopy, energy dispersive X-ray, X-ray diffraction, X-ray photoelectron spectroscopy, BET nitrogen adsorption, and UV-visible absorption spectroscopy. The conversion of the synthesized Cu2(OH)3Cl to sisal-like Cu(OH)2 was optically visualized and confirmed by corresponding SEM images, and an “etching-and-growing” mechanism was proposed. The results also show that the as-prepared CuO possesses a band gap of 2.27 eV and high specific surface area (75.8 m2/g), and its surface is highly rich in O. [ABSTRACT FROM AUTHOR]

Published
2009
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180. Nitrogen‐doped Hollow Co3O4 Nanofibers for both Solid‐state pH Sensing and Improved Non‐enzymatic Glucose Sensing.

Author

Dong, Qiuchen, Wang, Xudong, Willis, William S., Song, Donghui, Huang, Yikun, Zhao, Jing, Li, Baikun, and Lei, Yu

Subjects
GLUCOSE, NANOFIBERS, COBALT oxides, ELECTROCHEMICAL sensors, GLUCOSE analysis, DETECTION limit
Abstract

Nitrogen‐doped hollow cobalt oxide nanofibers (Co3O4 NFs) with both glucose catalytic activity and pH sensitivity were fabricated through core‐sheath electrospinning technique, followed by calcination. The as‐developed nitrogen‐doped hollow Co3O4 NFs were thoroughly characterized using various techniques, and then employed to fabricate a dual electrochemical sensor for both pH sensing and glucose sensing. The pH sensitivity of the developed nitrogen‐doped hollow Co3O4 NFs demonstrated a Nernst constant of 12.9–15.9 mV/pH in the pH range of 3.0∼9.0 and 6.8–10.7 mV/pH in the pH range of 9.0∼13.0, respectively. The developed hollow cobalt oxides nanofibers sensor also possesses glucose sensitivity of 87.67 μA mM−1 cm−2, the limit of detection of 0.38 μM (S/N=3), and an acceptable selectivity against several common interferents in non‐enzymatic glucose determination. High accuracy for monitoring glucose in human serum sample was also demonstrated. These features indicate that the as‐synthesized nitrogen‐doped hollow cobalt oxides nanofibers hold great potential in the development of a unique dual sensor for both solid‐state pH sensing and superior non‐enzymatic glucose sensing. [ABSTRACT FROM AUTHOR]

Published
2019
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