A bifunctional nanozyme of carbon dots-mediated Co9S8 formation

被引:15
作者
Li, Shijia [1 ]
Pang, Ernan [1 ]
Li, Ning [1 ]
Chang, Qing [1 ]
Yang, Jinlong [1 ,2 ]
Hu, Shengliang [1 ]
机构
[1] North Univ China, Res Grp New Energy Mat & Devices, Taiyuan 030051, Peoples R China
[2] Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
关键词
Carbon dots; Nanocomposite; Co9S8; nanoparticle; Controllable reduction; PEROXIDASE-LIKE ACTIVITY; GRAPHENE QUANTUM DOTS; COLORIMETRIC DETECTION; PHOTOLUMINESCENCE; METAL; H2O2; NANOCOMPOSITES; NANOMATERIALS; FABRICATION;
D O I
10.1016/j.jcis.2021.10.103
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Controlling the size of nanocrystals and inhibiting their agglomeration are of paramount importance for achieving ideal catalytic performance. Here we discovered that carbon dots (CDs) are not only able to serve as reductants but also as stabilizers of ultrasmall Co9S8 nanocrystals by means of their surface terminal groups. As a result, ultrasmall Co9S8 nanocrystals are incorporated into porous carbon nanosheets formed by splicing CDs. The resultant nanocomposites display a rich pore structure accompanying with large specific surface area and outstanding bifunctional performances to mimic the catalytic activity of peroxidase and oxidase without exerting any external energy. More importantly, the unique architecture endows Co9S8 nanocrystals with high stability and good durability. The nanocomposites have been demonstrated as a colorimetric sensor for detection of ascorbic acid with a superior anti-interference ability as well as a detection limit of 0.2 mu M. Our findings open new synthetic opportunities by tuning the interaction of CDs with the surrounding environment and enable advanced applications such as biomedicine and catalytic transformations. (C) 2021 Elsevier Inc. All rights reserved.
引用
收藏
页码:1348 / 1354
页数:7
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