Contact Potential Barriers and Photoelectric Properties of Pt-TiO2 Nanotubes†

doi:10.7503/cjcu20170517

Abstract

Abstract:

Composite TiO₂ nanotubes of Pt-modified(Pt-TNT) were synthesized via alkaline fusion-hydrothermal method under ambient atmosphere pressure. The microstructure morphology and properties of Pt-TNT were characterized. Composition analysis showed that the particulate matters on surface of Pt-TNT were composed of platinum and platinum oxides(Pt, PtO and PtO₂, Pt $O x δ +$ ). Contact potential barriers consisting of Pt $O x δ +$ -anatase-rutile-Pt $O x δ +$ are presumed to form upon Pt $O x δ +$ particle that deposited on the surface of Pt-TNT. The result of XRD indicated that a mixture of anatase and rutile phases prevailed in Pt-TNT. The 1047 and 1641 cm^-1(OH bending vibration) of FTIR were caused by the adsorption of δ-H₂O on the surface of Pt-TNT. Surface photovoltage spectroscopy(SPS) and electric field-induced surface photovoltage spectroscopy(FISPS) demonstrated that the bound exciton which showed sub-band gap transition characteristics with the asymmetric changes of photoelectric property corresponding to changes in polarity and strength of the external electric field. Compared with TiO₂, BET of Pt-TNT increased more than 3.55 times and was 41 m²/g by nitrogen adsorption.

Key words: Pt-modified, TiO₂ nanotubes, Photoelectric property, Contact potential barrier

CLC Number:

O614
TB383

TrendMD:

WENG Qing, LI Jingling, LIAO Wei, YU Hualiang, YU Qiaoying. Contact Potential Barriers and Photoelectric Properties of Pt-TiO₂ Nanotubes^†[J]. Chem. J. Chinese Universities, 2018, 39(6): 1152.

Figures/Tables 7

Fig.1 TEM images of TiO2(A) and different magnifications of Pt-TNT(B—D)

Fig.2 XRD patterns of TiO2(A) and Pt-TNT(B)a. Pt-TNT0; b. Pt-TNT1; c. Pt-TNT3; d. Pt-TNT5.

Fig.3 XPS survey spectra of Pt-TNT(A) Total spectra; (B)Pt4f; (C) Ti2p; (D) O1s. a. TiO2; b. Pt-TNT0; c. Pt-TNT1; d. Pt-TNT3; e. Pt-TNT5.

Fig.4 Schematic band diagrams among PtOxδ+, Anatase and Rutile interface of Pt-TNTE0: Vacuum level; Ec: conduction band edge; EFmp: fermi level of metal platinum; Ev: valence band edge; EFs: fermi level of semiconductor; Wmp: work function of metal platinum; x: width of the space charge region; Фmp: barrier height of metal platinum.

Fig.5 FTIR spectra of Pt-TNT a. TiO2; b. Pt-TNT0; c. Pt-TNT1; d. Pt-TNT3; e. Pt-TNT5.

Fig.6 SPS of TiO2(A) and Pt-TNT(B)

Fig.7 FISPS of TiO2(A) and Pt-TNT0(B), Pt-TNT1(C), Pt-TNT3(D) and Pt-TNT5(E)

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Contact Potential Barriers and Photoelectric Properties of Pt-TiO₂ Nanotubes^†

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