Table of Content

15 March 2015, Volume 33 Issue 2

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2015, 33(2):  0-0. 

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Nano Photoelectrochemical Cell-like Model for Visible-light-responded Overall Splitting of Water

LI Qiuye, JIN Zhensheng

2015, 33(2):  99-107.  DOI: 10.7517/j.issn.1674-0475.2015.02.099

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A nano photoelectrochemical (PEC) cell-like model for visible-light-responded over-all splitting of water was proposed based on the investigation of the photo-electric properties and morphology of the novel TiO₂. In this model, the reduction and oxidation of water proceeds on the inner and outer surface of novel TiO₂ nanotubes, respectively. The variable-valence metal oxide with suitable electrochemical properties could be used as the water oxidation catalyst, and its surface lattice oxygen would take part in O₂ evolution. The difficulty of overall water splitting, i.e., evolving of O₂ while needs to transfer four electrons, might be overcome. We want that this nano PEC cell-like model will be explored and verified by colleagues in the future.

Fabrication and Visible Light Photocatalytic Study of AgNPs/PEDOT Decorated Si Nanowires Array

DUAN Chunyang, WANG Hui, LI Fan, ZHANG Xiaohong

2015, 33(2):  108-116.  DOI: 10.7517/j.issn.1674-0475.2015.02.108

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Silicon nanowires array has been considered as a promising photocatalyst for large-scale application due to their enhanced photo-absorption ability and silicon's abundance. However, Si is indirect semiconductor and susceptible to photocorrosion in aqueous solution, which hinders it from photocatalytic application. In the present work, we construct a stable photocatalyst based on robust polymer and plasmonic metal nanoparticles decorated SiNWs array and investigated the influential factors of the decoration constituents on the SiNWs' surfaces through an organic dyestuff photocatalytic decomposition process. With the elaborate analysis of decomposition results' variation caused by the difference of the semiconductor's decoration and scavenger agent, the thickness of the cover layer and the plasmonic metal nanoparticles loading are shown to be influence the photocatalytic ability essentially.

Non-hydrothermal Method for Preparation of Nickel Sulfide Loaded Carbon Nanotubes for Catalytic Hydrogen Evolution

YU Shan, OUYANG Bo, LI Zhijun, MENG Qingyuan, FENG Ke, CHEN Bin, TONG Zhenhe(TUNG Chenho), WU Lizhu

2015, 33(2):  117-125.  DOI: 10.7517/j.issn.1674-0475.2015.02.117

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In this paper, a new material containing nickel sulfide, CN-NiS, was obtained by mixing sulfur-polyaniline nanotubes with nickel salt and calcination. TEM, XRD and XPS were used to investigate the composition, strucuture and morphology of CN-NiS. Using fluorescin and triethylamine as the photosensitiser and electron donor, a hydrogen evolution efficiency of 18.6 mmol·g^-1·h^-1 based on CN-NiS could be obtained under optimal conditions. With comparison to polyaniline, sulfur-polyaniline or nickel salt, CN-NiS is a better hydrogen evolution catalyst, indicating the importance of NiS for catalytic hydrogen evolution.

CdTe Quantum Dots Using L-Cys/MPA as Mixed-ligands: Preparation, Characterization and Application in Cell Labeling

DING Zhaoqiang, QUAN Jing, NIE Huali, ZHU Limin

2015, 33(2):  126-135.  DOI: 10.7517/j.issn.1674-0475.2015.02.126

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High-quality CdTe quantum dots (QDs) were rapidly synthesized in aqueous phase using both L-Cysteine (L-Cys) and mercaptopropionic acid (MPA) as mixed-ligands. Different technologies including UV-Vis spectra, fluorescence spectra, luminescence decay curves, transmission electron microscopy and X-ray diffraction analysis were employed to characterize the prepared QDs. The ratio of L-Cys and MPA was found to have influence on the growth kinetics and optical properties of the obtained QDs. Compared to single ligand of L-Cys or MPA, L-Cys/MPA as mixed-ligands could accelerate the red shifted rate of fluorescence emission peak wavelength effectively. CdTe QDs capped with mixed-ligands exhibited a high uniformity in diameter and an excellent photostability. 50L-CdTe (L-Cys/MPA molar ratio was 50%) held a high quantum yield of 66.4% and 75L-CdTe (L-Cys/MPA molar ratio was 75%) exhibited a luminescence decay lifetime of 46.8 ns. MTT assays showed that 75L-CdTe with emission of 615 nm maintained 75%-95% SiHa cell viability. Further study of labeling SiHa cell with the as-prepared 75L-CdTe indicated that the QDs are excellent biomarkers for SiHa cell. L-Cys and MPA as mixed-ligands with proper design can be employed to fabricate CdTe QDs with superior fluorescence properties and biocompatibility, which have potential in biological and medical fields as biomarker-candidates.

Effect of Hydrothermal Growing Method on the Structure and Crystalline Quality of ZnO Nanorod Array

ZHANG Meilin, JIN Feng, ZHENG Meiling, LIU Jie, DUAN Xuanming

2015, 33(2):  136-143.  DOI: 10.7517/j.issn.1674-0475.2015.02.136

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In this work, we systematically compared the structure and crystalline quality of ZnO nanorod arrays which were prepared by three methods. According to the basic source of the hydrothermal growing solution, ZnO nanorod was prepared by using a) ammonia solution (N method), b) hexamethylene tetramine (H method) and c) alternating of 2N and H (NH method), respectively. The morphology and crystalline quality of the ZnO NW array have been characterized by using scanning electron microscopy, Raman spectroscopy, X-ray diffractometer and transmission electron microscopy. The results demonstrate that ZnO prepared with N and NH method has better orientation than that of H method, and an increasing crystalline quality trend of N

Rhodamine-Pathalic Diamide Derivative for Colorimetric and Fluorescent "Turn-On" Detection of Cr³⁺

HAN Wen, YANG Yunxu, XU Tailin, SHENG Ruilong, LI Binlian, ZHU Haibo

2015, 33(2):  144-153.  DOI: 10.7517/j.issn.1674-0475.2015.02.144

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In this work, a Rhodamine-phthalic diamide derivative (RP1) was synthesized and characterized. It exhibited high selectivity to Cr³⁺over other metal cations inaqueous solution, and the "turn-on" response could be easily detected by means of absorption and fluorescence spectra, furthermore, an obvious color change from colorless to pink could be spontaneouly observed. Quantitive results showed that the binding model of RP1 and Cr³⁺was in 1:1 stoichiometry and the binding constant was 3.43×10⁴L/mol. Moreover, the mechanism study illustrated that the recognition of RP1 and Cr³⁺ went through a reversible coordination induced spiro-ring opening reaction, but not catalyzed hydrolysis of spiro-ring.

Design, Synthesis and Photophysical Properties of a Novel Benzo[h] Coumarin Aldehyde

ZHOU Bingjiang, DAI Qing, LIU Weimin

2015, 33(2):  154-160.  DOI: 10.7517/j.issn.1674-0475.2015.02.154

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A long-wavelength emssion Benzo[h] coumarin aldehyde-8-(diethylamino)-2-oxo-2H-benzo[h] coumarin aldehyde (BCA) was design and synthesized. Its photophysical properties in different solvents were investigated by absorption and fluorescence spectroscopy. An obvious slovatochromism and a large variation in color were observed. With the increase of solvent polarity, its luminescence changed from blue-green to red and the fluorescence quantum yield decreased from 0.98 to 0.26.

Spectral Characterization of Color Scanners Based on Principal Component Analysis

YU Haiqi, LIU Zhen, TIAN Quanhui

2015, 33(2):  161-167.  DOI: 10.7517/j.issn.1674-0475.2015.02.161

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Spectral characterization of color scanners can achieve accurate obtaining of color information of scanners in the different light sources and observers. It can also avoid metamerism to the most extent. Spectral characterization was applied to characterize the color scanners. Principal component analysis, which was combined with polynomial regression and BP neural network technology, set up the nonlinear transformation relationship between the scanner RGB signal and spectral reflectance image information. Firstly, principal component analysis (PCA) was used to analyze the spectral reflectance of the training sample followed by the principal component scalars calculation and the spectral was represented by principal component times scalars of principal component. Conversion models for scalars of principal component and polynomial or BP neural network was built by experiments. The reflectance was built by RGB low-dimension signal and spectral characterization of color scanners was achieved. Experimental results showed that the better number of polynomial terms was 19, reaching the accuracy of 1.7% RMSE of training sample and 1.9% RMSE of test sample. And the optimum network structure was single hidden layer with 15 layer node, reaching the accuracy of 1.3% RMSE of training sample and 1.5% RMSE of test sample. The accuracy of polynomial regression method is much lower, which is not fit for spectral characterization. The BP neural network model may achieve higher spectral characterization accuracy.

Recent Progress on the Controlled Release of Stimuli-responsive Microcapsules

JIANG Tao, HU Yanan, LONG Yue, SONG Kai

2015, 33(2):  168-176.  DOI: 10.7517/j.issn.1674-0475.2015.02.168

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Owing to their unique properties such as high stability, versatility, tunable membrane properties, and capability of delivering a variety of core substances, stimuli-responsive microcapsules have been applied to a wide range of areas, including drug encapsulation and release, artificial cells, catalysis, and chemical sensors. This review focused on the development of various types of stimuli-responsive microcapsules, including thermo-responsive, pH-responsive, magnetic-responsive, biological-responsive, electro-responsive, and light-responsive microcapsules in the area of controlled release application, among which the release process of light-responsive microcapsules was especially emphasized. Finally, the future prospects of the controlled release of microcapsules were discussed.

Synthesis and Application of Novel Arylsulfonium Salt Photoinitiators

ZHANG Bianxiang, GUO Yili, YANG Lihua, SHI Ruixue

2015, 33(2):  177-182.  DOI: 10.7517/j.issn.1674-0475.2015.02.177

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A new kind of aryl sulfonium salts were prepared by diphenyliodonium triflate with thioether compounds which have been synthesized by reaction of diphenyl disulfide ether with 1-methyl-2-phenyl indole. The compounds are characterized by ¹HNMR and ESI TOF-MS. In addition, the optimum reaction conditions were determined. The yield of the product was up to 62% in 1,1,2,2- tetrachloroethane solvent under CuI / Cu as the catalysts, in molar ratio of 1:1.2 of thioether compounds to diphenyliodonium triflate. Further, the optical performance test of the aryl sulfur salts show that they can be applied as cationic photoinitiators in UV-curing system.