Nanotribological properties of alkanephosphonic acid self-assembled monolayers on aluminum oxide: effects of fluorination and substrate crystallinity

Langmuir : the ACS Journal of Surfaces and Colloids
Matthew J BrukmanRobert W Carpick

Abstract

Two phosphonic acid (PA) self-assembled monolayers (SAMs) are studied on three aluminum oxide surfaces: the C and R crystallographic planes of single crystal alpha-alumina (sapphire) and an amorphous vapor-deposited alumina thin film. SAMs are either fully hydrogenated CH3(CH2)17PO3H2 or semifluorinated CF3(CF2)7(CH2)11PO3H2. Atomic force microscope (AFM) topographic imaging reveals that the deposited films are homogeneous, atomically smooth, and stable for months in the laboratory environment. Static and advancing contact angle measurements agree with previous work on identical or similar films, but receding measurements suggest reduced coverage here. To enable reproducible nanotribology measurements with the AFM, a scanning protocol is developed that leads to a stable configuration of the silicon tip. Adhesion for the semifluorinated films is either comparable to or lower than that for the hydrogenated films, with a dependence on contact history observed. Friction between each film and the tips depends strongly upon the type of molecule, with the fluorinated species exhibiting substantially higher friction. Subtle but reproducible differences in friction are observed for a given SAM depending on the substrate, revealing diffe...Continue Reading

References

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Citations

Jan 5, 2013·Faraday Discussions·Katerina BusuttilGraham J Leggett
Dec 25, 2007·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Judith A HarrisonPaul T Mikulski
May 16, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Anthony J Barthel, Seong H Kim
Jul 17, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Zhenyu ZhangGraham J Leggett
Jul 28, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Gilles GuerreroP Hubert Mutin
Feb 14, 2012·Advances in Colloid and Interface Science·Hefa Cheng, Yuanan Hu
Jul 24, 2014·Journal of the American Chemical Society·Christian MeltzerWolfgang Peukert
Oct 26, 2010·Journal of Colloid and Interface Science·Atsushi HozumiMakoto Yagihashi
Dec 5, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Nikolaos NikogeorgosGraham J Leggett
Aug 2, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Jonas PaulWolfgang Peukert
Feb 6, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Hongyu GaoDaniele Dini
Jul 18, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Getachew TizazuDavid G Lidzey
Jan 11, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Michael ChandrossGary S Grest
Jun 27, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·G LecollinetD Portet
Dec 17, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Peter ThissenGuido Grundmeier
Dec 25, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Atsushi Hozumi, Thomas J McCarthy
Jul 28, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Erin E FlaterRobert W Carpick
Aug 30, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Rosalynn Quiñones, Ellen S Gawalt
Sep 17, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Andrew Z SummersClare McCabe
Dec 10, 2019·ACS Applied Materials & Interfaces·Wei GuLiwei Chen

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