نتایج جستجو برای: carbon dots

تعداد نتایج: 306919  

Journal: :Journal of materials chemistry. C 2016
Yamin Liu Ping Wang K A Shiral Fernando Gregory E LeCroy Halidan Maimaiti Barbara A Harruff-Miller William K Lewis Christopher E Bunker Zhi-Ling Hou Ya-Ping Sun

Carbon dots of small carbon nanoparticles surface-functionalized with 2,2'-(ethylenedioxy)bis(ethylamine) (EDA) were synthesized, and the as-synthesized sample was separated on an aqueous gel column to obtain fractions of the EDA-carbon dots with different fluorescence quantum yields. As already discussed in the literature, the variations in fluorescence performance among the fractions were att...

2016
Hanxu Ji Feng Zhou Jiangjiang Gu Chen Shu Kai Xi Xudong Jia

Nitrogen-doped carbon dots are introduced as a novel substrate suitable for enzyme immobilization in electrochemical detection metods. Nitrogen-doped carbon dots are easily synthesised from polyacrylamide in just one step. With the help of the amino group on chitosan, glucose oxidase is immobilized on nitrogen-doped carbon dots-modified carbon glassy electrodes by amino-carboxyl reactions. The ...

2017
Shengliang Hu Yanbing Wang Wenyu Zhang Qing Chang Jinlong Yang

The emissive states of carbon dots have been tuned by controlling the charge transfer process. The carbon dots couple with molecules, which are made of a benzene ring and different heteroatom substituents, through amino-carboxylic bonds that are generally identified as charge transfer promoters at the interface. New ways of radiative recombination are created due to the transfer of photo-excite...

Journal: :Advanced healthcare materials 2017
Nagappa L Teradal Raz Jelinek

The "carbon nano-world" has made over the past few decades huge contributions in diverse scientific disciplines and technological advances. While dramatic advances have been widely publicized in using carbon nanomaterials such as fullerenes, carbon nanotubes, and graphene in materials sciences, nano-electronics, and photonics, their contributions to biology and biomedicine have been noteworthy ...

Behnaz Barazesh Mohammad Mazloum-Ardakani, Seyed Mohammad Moshtaghioun

Current work proposes an inimitable composite, with great electrical conductivity and quite enhanced surface area, (including conducting polymers (poly (cathechol)), Cu2O–carbon dots and green synthesized gold nanoparticles) for detecting acute carcinoembryonic antigen. At current work, the electropolymerization was offered instead of enzyme-catalyzed polymerization of poly (catechol). <b...

Journal: :Nanoscale 2014
Zhi Yang Minghan Xu Yun Liu Fengjiao He Feng Gao Yanjie Su Hao Wei Yafei Zhang

The synthesis of water-soluble nitrogen-doped carbon dots has received great attention, due to their wide applications in oxygen reduction reaction, cell imaging, sensors, and drug delivery. Herein, nitrogen-doped, carbon-rich, highly photoluminescent carbon dots have been synthesized for the first time from ammonium citrate under hydrothermal conditions. The obtained nitrogen-doped carbon dots...

Journal: :Nanoscale 2012
Xiaofang Jia Jing Li Erkang Wang

One-pot fabrication of fluorescent carbon dots was facilely developed by directly heating ascorbic acid aqueous solution at 90 °C. The resulting carbon dots possess excitation, pH and polarity-dependent luminescence and upconversion fluorescence properties.

Journal: :Nanoscale 2015
Siyu Liu Ning Zhao Zhen Cheng Hongguang Liu

Amino-functionalized fluorescent carbon dots have been prepared by hydrothermal treatment of glucosamine with excess pyrophosphate. The produced carbon dots showed stabilized green emission fluorescence at various excitation wavelengths and pH environments. Herein, we demonstrate the surface energy transfer between the amino-functionalized carbon dots and negatively charged hyaluronate stabiliz...

2015
Jia Zhang Yue Yuan Gaolin Liang Shu‐Hong Yu

Fragrant nitrogen-doped carbon dots of gram scale can be prepared from commercial bee pollens by a hydrothermal process. These carbon dots of 1-2 nm in size show promising applications in cellular imaging and catalysis/photocatalysis.

Journal: :Applied spectroscopy 2015
John C Vinci Ivonne M Ferrer Nathan W Guterry Verónica M Colón Joel F Destino Frank V Bright Luis A Colón

We synthesized sub-10 nm carbon nanoparticles (CNPs) consistent with photoluminescent carbon dots (C-dots) from carbon fiber starting material. The production of different C-dots fractions was monitored over seven days. During the course of the reaction, one fraction of C-dots species with relatively high photoluminescence was short-lived, emerging during the first hour of reaction but disappea...

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