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Effect of pH value of probe molecule on the graphene oxide-based surface enhanced Raman scattering

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Abstract

The dependence of graphene oxide (GO)-based surface enhanced Raman scattering (SERS) on the pH value of probe molecule was investigated. Water-soluble copper phthalocyanine (TSCuPc) was used as probe molecule and its pH value was adjusted with HCl and NaOH solution. The Raman spectra of TSCuPc with pH equaling 3, 8, and 11 on GO base were tested, respectively. The results show that both Raman enhanced intensity and full width at half maximum (FWHM) of characteristic peaks vary with the pH value of TSCuPc. It is shown that there is no obvious spectral widening of TSCuPc characteristic peaks when TSCuPc is neutral or acidic, and the chemical enhancement intensity of neutral TSCuPc on GO is biggest. In contrast, when TSCuPc is alkaline, the characteristic Raman peaks between 1350 and 1600 cm−1 of TSCuPc on GO are much wider and the intensities of characteristic peaks decrease considerably. The reasons for the pH dependence of GO-based Raman spectra were explored by comparing the wettability of molecule droplet on GO and the absorbance of different pH-adjusted TSCuPc films. It is found that the effect of molecule’s pH value on SERS can be contributed to the differences of concentration and distributions on GO surface for varied pH-treated molecule.

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Acknowledgements

This work is supported by the Basic Research Cost for National Central University (No. 106112015CDJXY120011) and the visitor fund of Key Laboratory of Optoelectronic Technology and Systems of the Education Ministry of China.

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  1. Key Laboratory of Optoelectronic Technology and Systems of the Education Ministry of China, Chongqing University, Chongqing, 400044, China

    Shao-li Cui, Xiao-qing Du, Chao Zeng, Lu Li & Jun Bao

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  1. Shao-li Cui
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  2. Xiao-qing Du
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Correspondence to Xiao-qing Du.

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Cui, Sl., Du, Xq., Zeng, C. et al. Effect of pH value of probe molecule on the graphene oxide-based surface enhanced Raman scattering. Appl. Phys. A 123, 421 (2017). https://doi.org/10.1007/s00339-017-1010-6

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