Assessment of the passivation capabilities of two different covalent chemical modifications on GaP(100)

Langmuir : the ACS Journal of Surfaces and Colloids
David RichardsAlbena Ivanisevic

Abstract

Gallium phosphide is a semiconductor material that can be used for the fabrication of optoelectronic devices. The report compares the ability of two similar organic molecules to form covalent bonds with the GaP(100) surface. Undecenoic acid (UDA) is a terminal alkene that can potentially form Ga-C bonds, and mercaptoundecanoic acid (MUA) is a thiol that can be used to generate Ga-S bonds. The chemical passivation capabilities of the functionalized surfaces exposed to different media were investigated by contact angle measurements, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). Toxicity levels, which are important for sensing applications, were evaluated by inductively coupled plasma mass spectrometry (ICP-MS) on the media in which surfaces were stored in order to identify any gallium leaching from the substrates. Both molecules formed fairly disordered monolayers demonstrated by comparable oxide thicknesses. The UDA molecules demonstrated better stability compared to MUA molecules based on contact angle measurements and tilt angle data extracted from XPS results. According to the XPS data, the UDA molecules formed a more dense adlayer compared to MUA molecules. With respect to toxicity, the UDA-funct...Continue Reading

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Citations

Jun 22, 2012·Accounts of Chemical Research·Scott A Jewett, Albena Ivanisevic
Feb 8, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Stewart J WilkinsAlbena Ivanisevic
Mar 13, 2014·Physical Chemistry Chemical Physics : PCCP·Alexandra KrawiczGary F Moore
Mar 27, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Stewart J WilkinsAlbena Ivanisevic
Nov 26, 2011·Chemical Society Reviews·David Richards, Albena Ivanisevic
Jun 3, 2016·ACS Applied Materials & Interfaces·Sudarat LeeStephen Maldonado
Aug 16, 2015·The Journal of Physical Chemistry Letters·Diana CedenoGary F Moore
May 23, 2021·Photosynthesis Research·Daiki NishioriGary F Moore

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