Kim, Min Young Lee, Seung Yong Kim, Juyoung Park, Chul Oh Shi, Wei Min, Hyegi Kim, Sang-il Kim, Hyun-Sik Shim, Young-Seok Lee, Beom Zoo Choi, Myung Sik Jeong, Hyung Mo Chun, Dong Won Lee, Kyu Hyoung 2024-01-19T10:01:05Z 2024-01-19T10:01:05Z 2023-05-04 2023-03 0925-4005 https://pubs.kist.re.kr/handle/201004/113905 Nanoscale defect structures on material surfaces introduce diverse chemical physics and have received sub-stantial attention. However, nano structure distortions due to low stability and poor reproducibility have indi-cated the limitation for further electro-device applications using defect control. In this study, the higher activated electron transfer from the nanogaps (NGs) enhances the sensitivity and accelerated depletion region purifying the porous-ZnO (P-ZnO) sheets for NO2 gas-sensor applications.-2.2 nm width of NGs on the (1010) orientated P-ZnO sheets and 12% higher surface oxygen vacancies (VO) are formed by using Li-ion implantation via the lithiation process. This intrinsic electron-doped ZnO by NGs shows a reduced work function (phi) and an elevated Fermi level (EF) compared to pristine ZnO. Therefore, the reaction between NO2 gas and ZnO significantly ac-celerates owing to the activated electron transfer that carries ultrafast recovery time (-16 s), and a low limit of detection (-4 ppb) at 150 celcius are obtained for the NG-P-ZnO sheet-based gas sensor. The generation of NGs on the surface via Li-ion implantation with reliable stability provides a new strategy to improve the electrochemical reactivity of semiconducting metal oxides beyond that obtained using conventional material engineering ap-proaches, such as size, shape, and dimension control. English Elsevier BV Generation of nanogaps on porous ZnO sheets via Li-ion implantation: NO2 gas sensing with ultrafast recovery time Article 10.1016/j.snb.2022.133283 1 Sensors and Actuators, B: Chemical, v.379 Sensors and Actuators, B: Chemical 379 N scie scopus 000972111800001 2-s2.0-85145697713 Chemistry, Analytical Electrochemistry Instruments & Instrumentation Chemistry Electrochemistry Instruments & Instrumentation Article OXYGEN VACANCY METAL-OXIDES ZnO NO 2 gas sensing Li-ion implantation Nanogap Recovery time