نتایج جستجو برای: carbon quantum dots

تعداد نتایج: 578596  

Journal: :The Analyst 2014
Xiaoyue Shan Lujing Chai Juanjuan Ma Zhaosheng Qian Jianrong Chen Hui Feng

Fluorescent B-doped carbon quantum dots (BCQDs) were prepared by a facile one-pot solvothermal route. The BCQDs can be used as a novel fluorescence sensing system for hydrogen peroxide and glucose detection.

2017
Jieren Shao Shoujun Zhu Huiwen Liu Yubin Song Songyuan Tao Bai Yang

Polymer carbon dots (PCDs) represent a new class of carbon dots (CDs) possessing sub-fluorophores and unique polymer-like structures. However, like small molecule dyes and traditional CDs, PCDs often suffer from self-quenching effect in solid state, limiting their potential applications. Moreover, it is hard to prepare PCDs that have the same chemical structure, exhibiting full-color emission u...

Journal: :Chemical communications 2011
Gui-zheng Zou Guo-dong Liang Xiao-li Zhang

Anodic near-infrared electrochemiluminescence (ECL) from CdTe quantum dots was achieved at low potential on a glass carbon electrode and a strategy for greatly enhanced band-gap ECL was presented.

Journal: :Chemical communications 2014
Yuhui Wang Duyang Gao Pengfei Zhang Ping Gong Chi Chen Guanhui Gao Lintao Cai

A new FRET model using near-infrared quantum-dots (NIR-QDs) and oxidized carbon nanoparticles (OCNPs) as the energy donor and acceptor was constructed and designed for insulin detection in complex human plasma.

Journal: :Chemical communications 2013
Ming Xuan Gao Chun Fang Liu Zhu Lian Wu Qiao Ling Zeng Xiao Xi Yang Wen Bi Wu Yuan Fang Li Cheng Zhi Huang

Highly PL carbon quantum dots (CQDs) were successfully prepared from C60 by introducing CTAB and H2O2 in aqueous NaOH under hydrothermal conditions. The CQDs displayed a nanoparticle aggregation-induced emission enhancement (NP-AIEE).

Journal: :Chemical communications 2015
Dinggeng He Xiaoxiao Yang Xiaoxiao He Kemin Wang Xue Yang Xing He Zhen Zou

A sensitive turn-on fluorescent sensor based on single-layer MnO2 nanosheet-quenched fluorescent carbon quantum dots has been developed for rapid and selective sensing of glutathione in aqueous solutions, as well as in living cells.

2012
Mohammad A. Halim

Our energy consumption relies heavily on the three components of fossil fuels (oil, natural gas and coal) and nearly 83% of our current energy is consumed from those sources. The use of fossil fuels, however, has been viewed as a major environmental threat because of their substantial contribution to greenhouse gases which are responsible for increasing the global average temperature. Last four...

Journal: :international journal of nano dimension 0
m. seyedsadjadi department of chemistry, science and research branch, islamic azad university, tehran, 1477892855 iran. f. asgari department of chemistry, science and research branch, islamic azad university, tehran, 1477892855 iran. n. farhadyar department of chemistry, varamin –pishva branch, islamic azad university, varamin, iran. n. molahasani department of chemistry, tehran shargh (qiamdasht) branch, islamic azad university, tehran, iran.

in this work, we report, optical properties of cd1-xsnxte quantum dots (x= 0.05, 0.10 and 0.15) synthesized in water using thioglycolic acid (tga) as a modifier agent. the optical characterization of the samples was performed through absorption (uv) and photoluminescence spectra (pl). a red shift absorption and fluorescent emission peaks was observed which can be related to the increase of nano...

2011
Suzannah Wood Sean McKenna John Klingner

Information systems are an essential part of everyday life. Standard computers rely on the detection of charge to process information; quantum computers use quantum states to represent information[15]. There are a few different techniques that can be used to complete quantum computations, including iontrap[3], quantum dots[1], and nuclear magnetic resonance (NMR) experiments. In the case of our...

Journal: :The Analyst 2013
Bangda Yin Jianhui Deng Xue Peng Qian Long Jiangna Zhao Qiujun Lu Qiong Chen Haitao Li Hao Tang Youyu Zhang Shouzhuo Yao

High quality carbon dots (C-dots) with down- and up-conversion fluorescence have been synthesized through low-temperature carbonization using sweet pepper as the carbon source. The C-dots with a quantum yield (QY) of 19.3% exhibit superior photophysical properties, for example, narrow and symmetric emission spectra, large stock shifts, resistance to photobleaching, and excitation-dependent fluo...

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