Synthesis and Characterization of Cubic P-type Semiconductor Cu1.8S-deposited TiO2 Nanobelts

doi:10.3724/SP.J.1077.2012.00038

Abstract

Abstract:

TiO₂ nanobelts deposited with cubic p-type semiconductor Cu_1.8S particles were prepared using Cu₂O-deposited TiO₂ nanobelts and thiourea as precursors under hydrothermal condition by Cu₂O sacrificial template process. The measurement results show that the reaction temperature, reaction time and thiourea concentration have strong influence on the purity and morphology of Cu_1.8S particles. A mixture phases of Cu_1.8S and Cu₂O on TiO₂ nanobelts were obtained at 120℃ for 25 h within 0.5 mol/L of thiourea concentration. While reaction temperature was raised to 160℃, the Cu_1.8S particles with high purity exhibited obvious aggregation, whereas the Cu_1.8S particles with high purity and well dispersion were prepared under 0.25 mol/L of thiourea concentration. The photocatalytic activities in degradation of Rhodamine B solution demonstrate that the Cu_1.8S or Cu₂O-loading catalysts show lower photodegradation activities as compared with that of pure TiO₂ nanobelts.

Key words: composite, cubic Cu_1.8S, TiO₂nanobelts, photocatalytic activity, p-n heterojunction

CLC Number:

TB381

LI Li, LEI Jing-Guo, JI Tian-Hao, ZHANG Xi-Peng. Synthesis and Characterization of Cubic P-type Semiconductor Cu_1.8S-deposited TiO₂Nanobelts[J]. Journal of Inorganic Materials, 2012, 27(1): 38-44.

Figures/Tables 8

Table 1 Preparation condition of the cubic Cu1.8S-loaded TiO2 nanobelts

Sample	Cu₂O-TiO₂/g	C/(mol·L^-1)	T/℃	t/h
CT-1	3	0.25	160	5
CT-2	3	0.25	160	15
CT-3	3	0.25	160	25
CT-4	3	0.50	120	25
CT-5	3	0.50	160	5
CT-6	3	0.50	160	15
CT-7	3	0.50	160	25

Fig. 1 XRD patterns of Cu2O-TiO2 nanobelts (a), CT-1 (b), CT-2 (c), CT-3 (d), CT-5 (e), CT-6 (f) and CT-7(g)

Fig. 2 Raman spectra of CT-3 (a) and TiO2 nanobelts (b)

Fig. 3 SEM images of Cu2O-TiO2 nanobelts (a), CT-3 (b), CT-4 (c) and CT-7 (d) as well as TEM images of CT-3 (e,f)

Fig. 4 UV-Vis DRS of the products

Fig. 5 N2 adsorption/desorption isotherms of (a) Cu2O-TiO2 nanobelts; (b) CT-3; (c) CT-4; (d) CT-7

Fig. 6 Visible-light photodegradation of Rhodamine B on H-CT-3, CT-3, CT-4 and CT-7 H-CT-3 is made from CT-3 dipping in dilute HCl solution for short time

Fig. 7 Absorption spectra of Rhodamine B solution at different reaction time with the catalysis of CT-3

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Synthesis and Characterization of Cubic P-type Semiconductor Cu_1.8S-deposited TiO₂Nanobelts

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