Raman Spectroscopic Studies on Coadsorption of Thiourea in the Nitric Acid Medium

Abstract

Abstract: The coadsorption of thiourea(TU) with NO₃^- in aqueous HNO₃ was studied by using normal Raman spectroscopy(NRS), surface enhanced Raman scattering spectroscopy(SERS) and time resolved SERS(TRSERS). It was found that TUis chemically adsorbed on the surface of silver electrode via S, and NO₃^- can be induced by TUand coadsorbed on the electrode through the protonated amino of TUin the solution containing HNO₃. The experimental results show that, at the potentials more positive than -0.6 V, TUis vertically adsorbed on the surface, while when the electrode potential goes negatively it gradually tends to tilt, even flat. Acomparative study on the stability of TUadsorbed on the silver surface in the medium of HNO₃ and HClO₄ respectively was carried out. It indicates that TUis more stable in aqueous HNO₃ than in aqueous HClO₄ at the relatively negative potentials(<-0.8 V), consequentially, the SERSsignal of TUcan still be detected in aqueous HNO₃ at the potential of -2.0 Vwhile it is out of detection even at -1.4 Vin the latter medium. The origin has been discussed in detail in this paper.

Key words: Thiourea, Nitrate ion, Coadsorption, SERS, TRSERS

CLC Number:

O642

TrendMD:

ZHONG Qi-Ling, LIU Feng-Ming, ZOU Dao-Wen, SHI Cai-Hui, XIE Yong, TIAN Zhong-Qun . Raman Spectroscopic Studies on Coadsorption of Thiourea in the Nitric Acid Medium[J]. Chem. J. Chinese Universities, 1998, 19(10): 1640.

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Raman Spectroscopic Studies on Coadsorption of Thiourea in the Nitric Acid Medium

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