| Title: | p-p Heterojunction of Nickel Oxide-Decorated Cobalt Oxide Nanorods for Enhanced Sensitivity and Selectivity toward Volatile Organic Compounds |
| Author(s): | Suh JM; Sohn W; Shim YS; Choi JS; Song YG; Kim TL; Jeon JM; Kwon KC; Choi KS; Kang CY; Byun HG; Jang HW; |
| Address: | "Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 08826, Republic of Korea. Center for Electronic Materials, Korea Institute of Science and Technology (KIST) , Seoul 02792, Republic of Korea. Department of Information and Communication Engineering, Kangwon National University , Samcheok 25913, Republic of Korea. Fundamental Technology Group, Central R&D Institute, Samsung Electro-Mechanics Co. , Suwon 16674, Republic of Korea. Advanced Nano-Surface Research Group, Korea Basic Science Institute (KBSI) , Daejeon 34133, Republic of Korea" |
| Journal Title: | ACS Appl Mater Interfaces |
| ISSN/ISBN: | 1944-8252 (Electronic) 1944-8244 (Linking) |
| Abstract: | "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 (Co(3)O(4)) nanorods (NRs) fabricated using the multiple-step glancing angle deposition method. The effective decoration of NiO on the entire surface of Co(3)O(4) NRs enabled the formation of numerous p-p heterojunctions, and they exhibited a 16.78 times higher gas response to 50 ppm of C(6)H(6) at 350 degrees C compared to that of bare Co(3)O(4) 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 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" |
| Keywords: | benzene cobalt oxide gas sensor glancing angle deposition nickel oxide; |
| Notes: | "PubMed-not-MEDLINESuh, Jun Min Sohn, Woonbae Shim, Young-Seok Choi, 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 eng 2017/12/14 ACS Appl Mater Interfaces. 2018 Jan 10; 10(1):1050-1058. doi: 10.1021/acsami.7b14545. Epub 2017 Dec 22" |
