NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 33
·14103-14107
·
IF 3.288
Chanchan Xu,Le Lv,Dawei Luo,Wei Liu
By using pyrazine derivatives, three different types of copper(I) iodide based inorganic–organic hybrid structures, 1D-CuI(2-mo-pz) (1, 2-mo-pz = 2-methoxy-pyrazine), 2D-CuI(2,3-dm-pz)0.5 (2, 2,3-dm-pz = 2,3-dimethyl-pyrazine), and 2D-Cu2I2(2,5-dm-pz)2 (3, 2,5-dm-pz = 2,5-dimethyl-pyrazine), have been obtained by using a slow-diffusion method. Single crystal and powder X-ray diffraction analyses reveal that these hybrid structures are a one-dimensional (1D) staircase chain based structure, two-dimensional (2D) staircase-chain based structure, and 2D rhomboid dimer based structure, respectively. All of the three compounds show photoluminescence, with the internal quantum yield (IQY) as high as 88.2% for 1. This work provides evidence that for this type of hybrid materials, the structure of the inorganic module could be determined by the selection of the organic ligands and that the substituted group on the organic ligands can influence the luminescence efficiency of the hybrid structures.
研究领域:
无机化学
·
材料化学
·
配位化学
·
光物理
·
功能材料
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 46
·65243-65254
·
IF 4.223
Chen Tao,Cao Zhonghong
To explore the relations between the number of accident deaths (NCD) and various factors in construction safety, a multiple linear regression model was established, based on the panel data of economy, construction labor, and the number of accident deaths in 31 provinces (regions) of China from 2009 to 2018. The results show that the average total profits and taxes (TPAT), and the death rate of ten thousand people (DR) are positively correlated with NCD, while the labor productivity (LP) is negatively correlated with it. Under the condition that other factors remain unchanged, NCD increases by 0.02 per a hundred million CNY. However, if DR increases by one ten thousand, NCD will increase by 8.66 on average. On the contrary, when LP increases by a hundred million CNY per ten thousand people, NCD decreases by 0.19. The model also predicts NCD in different provinces and cities from 2019 to 2020 with the method of quadratic exponential smoothing. As well, practice results show that the model is effective and practical.
研究领域:
安全工程
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建筑工程
·
应用统计学
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公共安全
·
劳动经济学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2012
·Vol. 47
·期 11
·3277-3282
·
IF 2.105
Jing Bo Zhang,Xiao Ning Li,Shou Li Bai,Rui Xian Luo,Ai Fan Chen,Yuan Lin
Well-crystallized one-dimensional (1D) SnO 2 nanobelts were in situ prepared using a simple water-assisted chemical vapor deposition (CVD) method. The small Sn particles with Au-modifications were used as source materials instead of big size Sn grains to ensure the high yield of SnO 2 belts. The Au layer was modified on the small Sn particles by treating Sn powders in HAuCl 4 solution combined with the UV irradiation. The as-prepared SnO 2 nanobelts were characterized by SEM, HRTEM, XRD, EDS and XPS. These results indicate that the growth temperature plays an important role in controlling the length-to-width ratio of nanobelts. The length-to-width ratio decreases with the growth temperature from 850 °C to 1000 °C. The nanobelts prepared at 850 °C shows a single-crystalline tetragonal rutile phase with a high length-to-width ratio (approximately tens of microns in length and 40–70 nm in width). However, below 850 °C, nanobelts cannot be formed. The as-prepared nanobelts exhibited excellent sensing properties compared with SnO 2 nanoparticles and high sensing selectivity towards NO 2 . The high sensing selectivity to NO 2 is attributed to the oxygen vacancies presenting in the as-prepared nanobelts.
研究领域:
材料科学
·
纳米技术
·
传感器学
·
无机化学
·
半导体材料
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 15
·2200605
·
IF 10.05
Shaofan Fang,Bo Zhou,Huixia Li,Hanlin Hu,Haizhe Zhong,Henan Li,Yumeng Shi
Metal halide perovskites are promising optoelectronic materials due to their unique luminescent properties. However, their practical application is limited by their poor chemical stability, especially in humid environments. Moisture can cause phase changes or chemical decomposition, resulting in significant fluorescence quenching. In this study, a copper-based organic–inorganic hybrid metal halide (t-BA) 3 Cu 6 I 9 is synthesized (t-BA + is the tert-butyl-ammonium ion (C(CH 3 ) 3 NH 3 + )). This material exhibits water-induced luminescence, and its chemical stability in humid environments is being investigated. Tetragonal t-BA 3 Cu 6 I 9 is not luminescent, but it reacts quickly with water in the air. The resultant (t-BA) 2 Cu 2 I 4 ·H 2 O has a broad green emission peak at 520 nm, high photoluminescence quantum yield of 59.4%. Remarkably, (t-BA) 2 Cu 2 I 4 ·H 2 O is converted back to t-BA 3 Cu 6 I 9 at temperatures above 40 °C. This phase conversion is highly repeatable, and the luminescent intensity can be fully recovered after 50 transformation cycles. The mechanism of luminescence is investigated through temperature-dependent photoluminescence spectra and theoretical calculation, which suggests that (t-BA) 2 Cu 2 I 4 ·H 2 O has a more localized charge distribution and sufficient polyhedral distortion, resulting in a bright and efficient emission from self-trapped excitons. This is the first report of water-induced luminescence in copper-based metal halides, and it paves the way for stable luminescent materials that are responsive to humidity.
研究领域:
材料化学
·
光物理学
·
无机化学
·
功能材料
·
发光材料
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 34
·1802848
·
IF 13.325
Zhenguang Wang,Yu-e Shi,Xuming Yang,Yuan Xiong,Yanxiu Li,Bingkun Chen,Wing-Fu Lai,Andrey L. Rogach
A water-soluble, positively charged polymer is obtained by copolymerizing chitosan with hypromellose, and the evaluation of its biocompatibility and the capacity for the loading of exogenous agents is performed. Films based on hypromellose grafted chitosan (HGC) are employed as a matrix to fabricate composite films by dehydration-triggered aggregation of copper nanoclusters (NCs). The resulting HGC/Cu NC films are transparent and exhibit an aggregation-induced emission enhancement of copper NCs, with a resulting photoluminescence quantum yield of 42%. The application of these orange emitting films as color converters for fabrication of remote light-emitting devices is demonstrated.
研究领域:
高分子科学
·
生物材料
·
纳米医学
·
药物递送
·
光电子学
·
生物医学工程
·
荧光成像
·
转化医学
✓ 已验证
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Yucan Che,Hongyu Pang,Huiyu Li,Lei Yang,Xinyao Fu,Shiqi Liu,Lan Ding,Juan Hou
Fluorescent carbon quantum dots are emerging as a new class of fluorescent probes due to their unique optical properties . Herein, we presented a simple, one-pot and effective preparation strategy for copper-functionalized carbon quantum dots (Cu-CDs). The Cu-CDs demonstrated excitation-independent emissions, high fluorescent quantum yield (~ 24.4%) and excellent fluorescent stability. The fluorescence of Cu-CDs could be quenched efficiently in the presence of histidine (His) due to the coordination occurring between surface Cu and imidazole side chains of His. Thus, the Cu-CDs could be used as an efficient fluorescent probe for His detection. Under optimal conditions, the fluorescent signals of Cu-CDs decreased linearly with the concentrations of His over a range of 0.1–15 µM. The detection limit was 30 nM. The proposed method provided obvious advantages of rapid response, convenience, simplicity, high selectivity and sensitivity. Moreover, good results also have been obtained for His detection in real biological fluid samples.
研究领域:
材料科学
·
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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