Marjunus, Roniyus (2018) Initial Sticking Coefficient Attenuation of Gases in Carbon Monoxide Sensing on Pt80Au14Ti6. In: The 2nd International Conference on Applied Sciences Mathematics and Informatics, 9-11 Agustus 2018, Hotel Horison, Bandar Lampung, Indonesia. (Submitted)

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Abstract

It has been proved that Pt80Au14Ti6 can give proper signals as a CO sensitive layer in air at room temperature. Unfortunately, there is no signal anymore from this sample, if it is kept in air more than 24 hours. To find the way how to refresh the samples, etching the samples in dry etching technic solves this problem. The atmosphere testing also has been done in technic etcher chamber by keeping the samples separately in Ar, N2, CO, and O2 with pressure 1 atm for 24 hours without taking out the samples after etching process from the chamber. These experiments found that oxygen causes this loss signal problem. Based on some scientific reports, oxygen can diffuse up to 170 Angstrom under the Pt surface to be subsurface oxygen. This diffusion changes the surface structure of Pt(100)(1x1) to hex-Pt(100) which impacts the attenuating of the initial sticking coefficient of gases. Simulations which have been conducted in this research produced the attenuating factor, i.e., 1 − 0.00585 exp (5.76664Osub), where Osub is the concentration of subsurface oxygen. Keywords: initial, sticking, coefficient, attenuation, gas

Item Type:	Conference or Workshop Item (Speech)
Subjects:	Q Science > QC Physics
Divisions:	Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA) > Prodi Fisika
Depositing User:	Roniyus Marjunus
Date Deposited:	02 Nov 2018 01:53
Last Modified:	02 Nov 2018 01:53
URI:	http://repository.lppm.unila.ac.id/id/eprint/8984

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