Controllable synthesis of CdSe QDs@NPC composite improving electron–hole separation and enhancing visible-light photocatalytic activities toward RhB degradation

Micro & nano letters

article

Jiayu Zhu¹  Ze Wang¹  Yafeng Li¹  Yuanrui Wang¹ 

[1]School of Chemical Engineering, Changchun University of Technology

关键词: X-ray diffraction;    photochemistry;    atomic emission spectroscopy;    wide band gap semiconductors;    cadmium compounds;    scanning electron microscopy;    II-VI semiconductors;    nanoporous materials;    catalysis;    nanofabrication;    photoluminescence;    X-ray photoelectron spectra;    crystal growth from solution;    transmission electron microscopy;    nanoparticles;    semiconductor quantum dots;    nanocomposites;    visible-light photocatalyst;    inductively coupled plasma atomic emission spectroscopy;    X-ray photoelectron spectroscopy;    HRTEM;    visible-light irradiation;    electron-hole separation;    visible-light photocatalytic activities;    semiconductor quantum dots;    high-resolution transmission electron microscopy;    composite;    nanoporous carbon;    X-ray diffraction;    CdSe-C;   

DOI  :  10.1049/mnl.2018.5682

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

In this work, NPC (nanoporous carbon) is purposely employed to accommodate the semiconductor CdSe QDs (quantum dots) in the absence of any capping agent to facilitate the visible-light photocatalyst CdSe QDs@NPC composite. CdSe QDs@NPC composite has been achieved by the facile method of the incipient-wetness deposition, and furthermore characterised by powder X-ray diffraction, inductively coupled plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller, transmission electron microscopy (TEM) and high-resolution TEM (HRTEM). The results of TEM and HRTEM show that CdSe QDs are implanted into NPC and bound to several nanometres. Both X-ray diffraction and HRTEM indicate that the as-synthesised CdSe QDs belong to the cubic phase. The photocatalytic performance of CdSe QDs@NPC composite has been evaluated by degrading the RhB under visible-light irradiation. NPC as electron acceptor and transport channel can enhance the synergism of CdSe and NPC by improving the electron–hole separation. Furthermore, the photocatalytic mechanism exhibits that h + and O 2 −• species are the decisive, active species in the degradation process of RhB.

【 授权许可】

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