Improvement of Surface-enhanced Raman Scattering Properties of TiO2 Nanoparticles by Metal Ni Doping†

doi:10.7503/cjcu20130936

Abstract

Abstract:

Pure TiO₂ and different amount Ni ions doped TiO₂ nanoparticles were synthesized by a sol-hydrothermal method and served as surface-enhanced Raman scattering(SERS) active substrate. The improvement of SERS properties of TiO₂ nanoparticles by metal Ni doping was mostly investigated. The results indicate that abundant metal doping energy levels can be formed near by the conduction band bottom in the energy gap of TiO₂ by an appropriate amount Ni ions doping, which can promote the TiO₂-to-molecule charge transfer process, and subsequently enhance SERS signals of adsorbed molecule on TiO₂ substrate, and improve remarkably SERS properties of TiO₂ nanoparticles.

Key words: Surface-enhanced Raman scattering(SERS), TiO₂, Metal doping, Charge transfer

CLC Number:

O657
O649

TrendMD:

JIANG Xin, QIN Xiaoyu, GONG Mengdi, LI Xiuling, LI Guangzhi, YANG Libin, ZHAO Bing. Improvement of Surface-enhanced Raman Scattering Properties of TiO₂ Nanoparticles by Metal Ni Doping^†[J]. Chem. J. Chinese Universities, 2014, 35(3): 488.

Figures/Tables 6

Fig.1 XRD patterns of different samples a. TiO2; b. 0.5%Ni-TiO2; c. 1%Ni-TiO2; d. 3%Ni-TiO2; e. 5%Ni-TiO2.

Fig.2 TEM images of TiO2(A) and 3%Ni-TiO2(B) samples

Table 1 XPS data of pure TiO2 and 3%Ni-TiO2 samples

Sample	E_b/eV
Sample	T $i 2 p 32$	T $i 2 p 12$	O₁_s	N $i 2 p 32$	N $i 2 p 12$
Pure TiO₂	459.0	464.7	530.2
3%Ni-TiO₂	458.8	464.5	530.1	855.9	873.5

Table 1 XPS data of pure TiO2 and 3%Ni-TiO2 samples

Sample	E_b/eV
Sample	T $i 2 p 32$	T $i 2 p 12$	O₁_s	N $i 2 p 32$	N $i 2 p 12$
Pure TiO₂	459.0	464.7	530.2
3%Ni-TiO₂	458.8	464.5	530.1	855.9	873.5

Fig.3 UV-Vis DRS spectra of different samplesa. TiO2; b. TiO2-MBA; c. 3%Ni-TiO2; d. 3%Ni-TiO2-MBA.

Fig.4 SERS spectra of 4-MBA adsorbed on different samples a. TiO2; b. 0.5%Ni-TiO2; c. 1%Ni-TiO2; d. 3%Ni-TiO2; e. 5%Ni-TiO2.

Fig.5 Normalized Raman intensity of 4-MBA adsorbed on Ni-TiO2 at 1594 cm-1Ratio of Raman intensity of 4-MBA adsorbed on Ni-TiO2 to that of 4-MBA adsorbed pure TiO2 at 1594 cm-1.

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Improvement of Surface-enhanced Raman Scattering Properties of TiO₂ Nanoparticles by Metal Ni Doping^†

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