文献类型：期刊文献

英文题名：Water-sensitive phase-transition of a carbon dot-calcium carbonate composite for moisture detection in organic solvents

作者：Yu, Haijun[1];Li, Haoxiang[1];Chen, Chao[1];Zhou, Shengmin[1];Wang, Ping[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Biomed Nanotechnol Ctr, Sch Biotechnol, Shanghai 200237, Peoples R China;[2]Univ Minnesota, Dept Bioprod & Biosyst Engn, St Paul, MN 55108 USA

年份：2019

卷号：11

期号：20

起止页码：2634

外文期刊名：ANALYTICAL METHODS

收录：;EI(收录号：20192206974117);WOS:【SCI-EXPANDED(收录号:WOS:000468828600003)】；

基金：The authors are thankful for financial support for this work from the National Science Foundation of China (21672065 and 21636003), the Fundamental Research Funds for the Central Universities (22221818014), the 111 Project (B18022), the Shanghai Pujiang Program (16PJ1402500), the National Special Fund for State Key Laboratory of Bioreactor Engineering (2060204), and the Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM).

语种：英文

外文关键词：Moisture determination - Semiconductor quantum dots - Calcium carbonate - Fluorescence - Nanocomposites - Organic solvents

摘要：We report herein a nanocomposite that has a continuous phase of amorphous calcium carbonate (ACC) filled with fluorescent carbon quantum dots (CDs) and undergoes phase transitions triggered by changes inmoisture content in organic solvents. The phase transitions involve aggregation of the nanocomposite particles (in the order of 20 nm) and crystallization of the ACC phase, expelling the CDs from the composite and generating fluorescent signals at the same time. This can be triggered with a moisture content as low as 15 ppm, and the intensity of the fluorescent signal can be correlated quantitatively with a moisture content of up to 100%.