Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 11, Pages 4515-4521Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp808195j
Keywords
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Funding
- NSFC [20775034, 20535010]
- National Science Fund for Creative Research Groups [20821063, 20721002]
- National Basic Research Program of China [2007CB925102, 2007CB714501]
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The preparation and interfacial properties of self-assembled monolayers (SAMs) of 3-mercaptopropylphosphonic acid [HS-(CH2)(3)-PO3H2, MPPA] adsorbed on Au surfaces have been systematically investigated with the electrochemical method, X-ray photoelectron spectroscopy (XPS), and surface-enhanced internal reflection infrared spectroscopy measurements. An improved rinse method (base-acid rinse protocol) is presented to prepare the MPPA monolayers free of unbound MPPA thiols. Experimental results show that the effect of the degree of dissociation of -PO3H2 groups on the compactness of MPPA-SAMs is nonlinear possibly because of hydrogen bond interaction and the dibasic nature and hydrophilicity of the -PO3H2 groups. The effects of pH and the electric field on the surface charge of MPPA-SAMs are investigated.
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