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Yang, Jie,Gao, Yan,Kim, Jeoung Woo,He, Yujian,Song, Rui,Ahn, Chi Won,Tang, Zhiyong Royal Society of Chemistry 2010 Physical chemistry chemical physics Vol.12 No.38
<P>A partial cation exchange reaction between CdTe nanoparticles and Bi<SUP>3+</SUP> ions gives rise to spontaneous formation of two-dimensional Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets. The average size and thickness of the nanosheets are around 200 and 6.9 nm, respectively. Both CdTe and Bi<SUB>2</SUB>Te<SUB>3</SUB>, which are there as the form of nanoparticles with average sizes of 3.4 nm, are found to be homogenously distributed in the nanosheets. The Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets are further integrated into a pellet by using spark plasma sintering for optimizing thermoelectric performance. Compared with the bulk n-type Bi<SUB>2</SUB>Te<SUB>3</SUB>, the pellets composed of Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets exhibit a considerably low thermal conductivity, 0.63 W m<SUP>−1</SUP> K<SUP>−1</SUP>, and a slightly high Seebeck coefficient, −182.2 μV K<SUP>−1</SUP>, at room temperature.</P> <P>Graphic Abstract</P><P>Two-dimensional Bi<SUB>2</SUB>Te<SUB>3</SUB>/CdTe nanosheets are prepared through a self-reorganization strategy, and they show a rather high thermoelectrical performance. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cp00079e'> </P>
Zhikun Zhang,Ying Zhou,Jing-Kui Yang,Peilong Wang,Xiaoou Su,Hong Zhao,Yujian He,Zhiqin Cao,Maoqiang Luo 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.7
A new method has been proposed to realize the visual detection of Cr3+ using 4-nitrobenzenethiol (4-NBT) and 4-mercaptobenzoic acid (4-MBA) modified silver nanoparticles (AgNPs). The presence of Cr3+ induces the aggregation of AgNPs through cooperative metal–ligand interaction, resulting in a color change from bright yellow to purple. Consequently, Cr3+ could be monitored by colorimetric response of AgNPs by a UV-Vis spectrophotometer or even naked eyes. We firstly used ethylene diamine tetraacetic acid (EDTA) as a masking agent to selectively detect Cr3+, and other metal ions have little influence on the Cr3+–AgNPs system. The cofunctionalized AgNPs exhibited a highly sensitive detection limit of Cr3+, which is as low as 5 x 10-9 mol L-1, and the absorbance ratio (A600nm /A387nm) is linear with the concentration of Cr3+ ranging from 5 x 10-9 mol L-1 to 2 x 10-6 mol L-1 with a coefficient of 0.993. Particularly, the sensor has been further evaluated to monitor the concentration of Cr3+ in drinking water, the recovery was in good agreement with those obtained by ICP-MS, indicating that this proposed method is successfully applied in real samples.