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219. Supersaturation-controlled synthesis of diverse In2O3 morphologies and their shape-dependent sensing performance.

Author

Yang, Wei, Wan, Peng, Meng, Hu, Hu, Jiming, and Feng, Liang

Subjects
SUPERSATURATION, INDIUM compounds synthesis, NANOSTRUCTURED materials, MORPHOLOGY, AMMONOLYSIS, OXIDATION, VAPORS
Abstract

The precisely controlled synthesis of a specific morphology is proved to be highly effective for enhancing sensing performance of functional micro- and nano-materials. Thus, a comprehensive understanding of the effect of synthesis conditions on morphology evolution is of great importance. In this paper, by using In2O3 as an example, we demonstrate the great effect of supersaturation on the morphology evolution during the growth process. Under vapour-phase synthesis, by varying positions of product collection, the amount of the starting materials, and reaction temperatures, a continuous two-step route consisting of ammonolysis and re-oxidation processes was developed for the morphology evolution of several kinds of In2O3, including octahedron strings, nanowires, crystal chains, lollipop-like structures, and particles. The controlled supersaturation of the In2O3 vapour was eventually proved to be a decisive factor for the formation of various In2O3 morphologies. Furthermore, we evaluated the gas-sensing properties of the three kinds of one-pot synthesized In2O3, indicating a shape-dependent relationship with sensing performance. The present work not only offers a unique strategy to control supersaturation in vapour-phase synthesis, but also provides an opportunity to deeply understand the morphology-dependent sensing performance. [ABSTRACT FROM AUTHOR]

Published
2015
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249. Label-free Detection of Zn2+Based on G-quadruplex

Author

Guo, Yahui, Sun, Yan, Shen, Xiaoqiang, Zhang, Kunchi, Hu, Jiming, and Pei, Renjun

Abstract

Herein, we developed a sensing strategy for the label-free detection of Zn2+based on G-quadruplex. In the absence of Zn2+, there was a fluorescence enhancement of thioflavin T by interaction with human telomere sequence. On the addition of Zn2+, Zn2+induced a more compact G-quadruplex structure to release thioflavin T, resulting in a fluorescence decrease. This simple “mix-then-detect” method gave the detection limit of 0.91 μM with linear dynamic ranges from 0 to 10 μM. Because it does not require the use of expensive and unstable DNAzyme systems, or need synthesis and modification of nanomaterials, this label-free biosensor is simple, fast, cost-effective and applicable for real samples taken from lake water.

Published
2015
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