EPD of Reverse Micelle Pd and Pt Nanoparticles onto InP and GaN for High-Response Hydrogen Sensors

0396586 - ÚFE 2014 RIV CH eng C - Conference Paper (international conference)
Žďánský, Karel - Yatskiv, Roman - Černohorský, Ondřej - Piksová, K.
EPD of Reverse Micelle Pd and Pt Nanoparticles onto InP and GaN for High-Response Hydrogen Sensors.
ELECTROPHORETIC DEPOSITION: FUNDAMENTALS AND APPLICATIONS IV. Vol. 507. ZURICH: TRANS TECH PUBLICATIONS LTD, 2012 - (Boccaccini, A.; VanDeBiest, O.; Clasen, R.; Dickerson, J.), s. 169-173. ISBN 9783037853795. ISSN 1013-9826.
[4th International Conference on Electrophoretic Deposition: Fundamentals and Applications. Puerto Vallarta (MX), 02.10.2011-07.10.2011]
Institutional support: RVO:67985882
Keywords : Electrophoresis * Metal Nanoparticles * Schottky Barrier
Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

We investigated properties of nanolayers electrophoretically deposited (EPD) onto semiconductor indium phosphide (InP) or gallium nitride (GaN) single crystals from colloid solutions of metal palladium (Pd), platinum (Pt) or bimetallic Pd/Pt nanoparticles (NPs) in isooctane. Colloids with metal NPs were prepared by reaction of metal compounds with the reducing agent hydrazine in water confined to reverse micelles of surfactant AOT.. Chopped DC electric voltage was applied for the time period to deposit metal NPs, only partly covering surface of the wafer. The deposits were image-observed by scanning electron microscopy (SEM)..Diodes with porous Schottky contacts were made by printing colloidal graphite on the NPs deposited surface and making ohmic contact on the blank side of the wafer. The diodes showed current-voltage characteristics of excellent rectification ratio and barrier height values close to Schottky-Mott limit, which was an evidence of negligible Fermi level pinning. Large increase of current was observed after switching on a flow of gas blend hydrogen in nitrogen (H-2/N-2). The diodes were measured with various H-2/N-2 in the range from 1000 ppm to 1 ppm of H-2. Current change ratios about 10(6) and about 10 were achieved with 1000 ppm and 1 ppm H-2/N-2.
Permanent Link: http://hdl.handle.net/11104/0224369