Disorder-derived, strong tunneling attenuation in bis-phosphonate monolayers
Disorder-derived, strong tunneling attenuation in bis-phosphonate monolayers
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双膦酸盐单层中无序产生的强隧道衰减
DOI:
10.1088/0953-8984/28/9/094008
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Tornow
中科院分区:
文献类型:
--
作者:
Pathak;Anshuma;Achyut;Kung-Ching;Schmolke;Hannah;Klages;Claus-Peter;Schwartz;Jeffrey;Tornow
Monolayers of alkyl bisphosphonic acids (bisPAs) of various carbon chain lengths (C4, C8, C10, C12) were grown on aluminum oxide (AlO x) surfaces from solution. The structural and electrical properties of these self-assembled monolayers (SAMs) were compared with those of alkyl monophosphonic acids (monoPAs). Through contact angle (CA) and Kelvin-probe (KP) measurements, ellipsometry, and infrared (IR) and x-ray photoelectron (XPS) spectroscopies, it was found that bisPAs form monolayers that are relatively disordered compared to their monoPA analogs. Current–voltage (J–V) measurements made with a hanging Hg drop top contact show tunneling to be the prevailing transport mechanism. However, while the monoPAs have an observed decay constant within the typical range for dense monolayers, β mono= 0.85±0.03 per carbon atom, a surprisingly high value, β bis= 1.40±0.05 per carbon atom, was measured for the bisPAs. We attribute this to a strong contribution of'through-space'tunneling, which derives from conformational disorder in the monolayer due to strong interactions of the distal phosphonic acid groups; they likely form a hydrogen-bonding network that largely determines the molecular layer structure. Since bisPA SAMs attenuate tunnel currents more effectively than do the corresponding monoPA SAMs, they may find future application as gate dielectric modification in organic thin film devices.
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影响因子:
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DOI:
10.1039/c3tb20565g
发表时间:
2013
期刊:
Journal of materials chemistry. B
影响因子:
--
作者:
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通讯作者:
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DOI:
10.1002/jbm.a.31651
发表时间:
2008
期刊:
Journal of biomedical materials research. Part A
影响因子:
--
作者:
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