L-cysteine self-assembled monolayers (SAMs) have been deposited on gold from the liquid and vapour phase. Synchrotron based high resolution x-ray photoemission spectroscopy has been used to characterize the sulfur chemical states at the SAM/gold interface. Results obtained from pristine and x-ray irradiated samples, prepared with both as-received and purified L-cysteine, are reported. Pristine samples prepared with purified cysteine are characterized by an intense, largely dominant S 2p state at a binding energy around 162 eV (2p3/2 level) assigned to thiolates. A second doublet around 161 eV develops during irradiation. By comparison with the literature, this doublet is assigned to atomic sulfur present either as impurity or generated by S–C bond scission. Comparativemeasurements performed, under similar experimental conditions, on pristine 3-mercaptopropionicacid [HS(CH2)2COOH] layers deposited from the liquid phase are also presented and discussed.

High Resolution XPS of the S 2p core level region of the L-cysteine/gold interface

CAVALLERI, ORNELLA;TERRENI, SILVANA;CANEPA, MAURIZIO;ROLANDI, RANIERI
2004-01-01

Abstract

L-cysteine self-assembled monolayers (SAMs) have been deposited on gold from the liquid and vapour phase. Synchrotron based high resolution x-ray photoemission spectroscopy has been used to characterize the sulfur chemical states at the SAM/gold interface. Results obtained from pristine and x-ray irradiated samples, prepared with both as-received and purified L-cysteine, are reported. Pristine samples prepared with purified cysteine are characterized by an intense, largely dominant S 2p state at a binding energy around 162 eV (2p3/2 level) assigned to thiolates. A second doublet around 161 eV develops during irradiation. By comparison with the literature, this doublet is assigned to atomic sulfur present either as impurity or generated by S–C bond scission. Comparativemeasurements performed, under similar experimental conditions, on pristine 3-mercaptopropionicacid [HS(CH2)2COOH] layers deposited from the liquid phase are also presented and discussed.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/246805
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