Suh, Jun Min Sohn, Woonbae Shim, Young-Seok Cho, Jang-Sik Song, Young Geun Kim, Taemin L. Jeon, Jong-Myeong Kwon, Ki Chang Choi, Kyung Soon Kang, Chong-Yun Byun, Hyung-Gi Jang, Ho Won 2024-01-19T23:33:42Z 2024-01-19T23:33:42Z 2022-01-25 2018-01 1944-8244 https://pubs.kist.re.kr/handle/201004/121836 The utilization of p-p isotype heterojunctions is an effective strategy to enhance the gas sensing properties of metal-oxide semiconductors, but most previous studies focused on p-n heterojunctions owing to their simple mechanism of formation of depletion layers. However, a proper choice of isotype semiconductors with appropriate energy bands can also contribute to the enhancement of the gas sensing performance. Herein, we report nickel oxide (NiO)-decorated cobalt oxide (Co3O4) nanorods (NRs) fabricated using the multiple-step glancing angle deposition method. The effective decoration of NiO on the entire surface of Co3O4 NRs enabled the formation of numerous p-p heterojunctions, and they exhibited a 16.78 times higher gas response to 50 ppm of C6H6 at 350 degrees C compared to that of bare Co3O4 NRs with the calculated detection limit of approximately 13.91 ppb. Apart from the p-p heterojunctions, increased active sites owing to the changes in the orientation of the exposed lattice surface and the catalytic effects of NiO also contributed to the enhanced gas sensing properties. The advantages of p-p selective gas sensing. heterojunctions for gas sensing applications demonstrated in this work will provide a new perspective of heterostructured metal-oxide nanostructures for sensitive and selective gas sensing. English American Chemical Society p-p Heterojunction of Nickel Oxide-Decorated Cobalt Oxide Nanorods for Enhanced Sensitivity and Selectivity toward Volatile Organic Compounds Article 10.1021/acsami.7b14545 1 ACS Applied Materials & Interfaces, v.10, no.1, pp.1050 - 1058 ACS Applied Materials & Interfaces 10 1 1050 1058 N scie scopus 000422814400113 2-s2.0-85040313880 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article SENSING MATERIALS GAS CO3O4 SEMICONDUCTOR COMPOSITE SENSORS NIO DESIGN CELLS CR2O3 cobalt oxide nickel oxide glancing angle deposition gas sensor benzene