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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Flinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, Australia
Flinders Univ S Australia, Coll Sci & Engn, Flinders Microscopy & Microanal, Adelaide, SA 5042, AustraliaFlinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, Australia
Alharbi, Ahlam R. M.
Roman, Tanglaw
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Flinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, Australia
Flinders Univ S Australia, Coll Sci & Engn, Flinders Microscopy & Microanal, Adelaide, SA 5042, AustraliaFlinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, Australia
Roman, Tanglaw
Alotabi, Abdulrahman S.
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Flinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, Australia
Al Baha Univ, Fac Sci, Dept Phys, Al Baha 65779, Saudi ArabiaFlinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, Australia
Alotabi, Abdulrahman S.
Koper, Ingo
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Flinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, AustraliaFlinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, Australia
Koper, Ingo
Andersson, Gunther G.
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Flinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, Australia
Flinders Univ S Australia, Coll Sci & Engn, Flinders Microscopy & Microanal, Adelaide, SA 5042, AustraliaFlinders Univ S Australia, Flinders Inst Nanoscale Sci & Technol, Adelaide, SA 5042, Australia