CuS/Ag2S纳米复合物的制备及类过氧化物酶性质

doi:10.7503/cjcu20200035

摘要/Abstract

摘要：

采用水热法合成了一种微球状的CuS/Ag₂S纳米复合物. 通过透射电子显微镜、紫外-可见吸收光谱和拉曼光谱等对其形貌及光学性质进行了表征; 考察了其类过氧化物酶性质, 并通过表面增强拉曼散射原位监测了类过氧化物酶催化反应. 以3,3',5,5'-四甲基联苯胺(TMB)为底物进行显色反应, 结果表明, 在H₂O₂存在下CuS/Ag₂S 纳米复合物具有类过氧化物酶的性质, 可以将无色的TMB氧化成蓝色的oxTMB. 基于此实现了对微量H₂O₂的检测.

关键词: 纳米复合物, 类过氧化物酶, 拉曼光谱, 过氧化氢

Abstract:

Amicrosphere-shaped CuS/Ag₂S nanocomposites were synthesized by hydrothermal method. The morphology and optical properties of CuS/Ag₂S nanocomposites were characterized by transmission electron microscopy, UV-Vis absorption spectroscopy, and Raman spectroscopy. The peroxidase-like properties were investigated, and peroxidase-like reactions catalyzed by CuS/Ag₂S nanocomposite were detected by surface-enhanced Raman scattering in situ. The colorimetric reaction was performed using 3,3',5,5'-tetramethyl-benzidine(TMB) as a substrate, and it was proved that CuS/Ag₂S nanocomposite has peroxidation-like properties in the presence of hydrogen peroxide(H₂O₂) which can oxidize colorless TMB to blue oxTMB. And the detection of H₂O₂ are realized.

Key words: Nanocomposite, Peroxidase-like, Raman spectroscopy, H₂O₂

中图分类号:

O611

TrendMD:

王瑞雪, 尹冬梅, 宋永新, 单桂晔. CuS/Ag₂S纳米复合物的制备及类过氧化物酶性质. 高等学校化学学报, 2020, 41(6): 1218.

WANG Ruixue, YIN Dongmei, SONG Yongxin, SHAN Guiye. Preparation of CuS/Ag₂S Nanocomposite and the Peroxidase-like Properties ^†. Chem. J. Chinese Universities, 2020, 41(6): 1218.

图/表 6

Fig.1 TEM(A, C) and HRTEM(B, D) images of CuS(A, B) and CuS/Ag2S nanocomposite(C, D)

Fig.2 UV-Vis absorption spectra of CuS(a) and CuS/Ag2S nanocomposite(b)

Fig.3 Raman spectra of CuS(a) and CuS/Ag2S nanocomposite(b)

Fig.4 UV-Vis absorption spectra of the catalytic oxidation reaction of TMB in the presence of H2O2(A), CuS(B) and CuS/Ag2S(C) at different time, the mechanism of CuS/Ag2S nanocomposite catalyzing H2O2(D), the linear plot of -ln(I/I0) vs. time at λ = 652 nm(E) and the kobs value of CuS nanoparticles, CuS/Ag2S nanocomposites and control group(F) The inset of (C) shows the photograph of the oxidation process of TMB.

Fig.5 Raman spectra of CuS/Ag2S/TMB/H2O2 system for different reaction time Reaction time/min: a. 0; b. 2; c. 4; d. 6; e. 8; f. 10.

Fig.6 UV-Vis absorption spectra of the catalytic oxidation reaction of CuS/Ag2S/H2O2/TMB system with

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CuS/Ag₂S纳米复合物的制备及类过氧化物酶性质

Preparation of CuS/Ag₂S Nanocomposite and the Peroxidase-like Properties ^†

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