Cho, Nam Gyu Hwang, In-Sung Kim, Ho-Gi Lee, Jong-Heun Kim, Il-Doo 2024-01-20T16:34:25Z 2024-01-20T16:34:25Z 2021-09-04 2011-07-05 0925-4005 https://pubs.kist.re.kr/handle/201004/130186 This work presents a simple and versatile route to produce macroporous p-type metal oxide thin films. Two-dimensional arrays of p-type NiO films with a hollow hemisphere structure were fabricated by colloidal templating and RF-sputtering followed by a subsequent heat treatment. The diameter and shell thickness of the NiO hemisphere were 800 nm and 20 nm, respectively. X-ray diffraction and high-resolution transmission electron microscopy analysis indicate that the pure NiO phase with grain size of 10 nm was obtained at calcination temperatures that exceeded 450 degrees C. Close-packed arrays of hollow NiO hemispheres were found to exhibit p-type gas sensing properties against (CO, H-2, C3H8, CH4, NO2, and C2H5OH), leading to significantly enhanced responses to C2H5OH (R-gas/R-air = 5.0 at 200 ppm). (C) 2010 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA SENSITIVITY Gas sensing properties of p-type hollow NiO hemispheres prepared by polymeric colloidal templating method Article 10.1016/j.snb.2010.12.031 1 SENSORS AND ACTUATORS B-CHEMICAL, v.155, no.1, pp.366 - 371 SENSORS AND ACTUATORS B-CHEMICAL 155 1 366 371 scie scopus 000291455200053 2-s2.0-79956337375 Chemistry, Analytical Electrochemistry Instruments & Instrumentation Chemistry Electrochemistry Instruments & Instrumentation Article SENSITIVITY Nickel oxide Gas sensor Nanostructure Colloidal template Hollow hemisphere