Modulation and Modeling of Three-Dimensional Nanowire Assemblies Targeting Gas Sensors with High Response and Reliability
[1];
[2];
[4];
[2]
- Korea Advanced Institute Science and Technology (KAIST), Daejeon (Korea, Republic of); Yale University, New Haven, CT (United States)
- Korea Advanced Institute Science and Technology (KAIST), Daejeon (Korea, Republic of)
- Korea Advanced Institute Science and Technology (KAIST), Daejeon (Korea, Republic of); Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
- Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
- Korea Research Institute of Chemical Technology, Daejeon (Korea, Republic of)
- Korea Advanced Institute Science and Technology (KAIST), Daejeon (Korea, Republic of); Korea Institute of Materials Science, Changwon (Korea, Republic of)
Abstract Despite improved sensitivity, simple downsizing of gas‐sensing components to randomly arranged nanostructures often faces challenges associated with unpredictable electrical conduction pathways. In the present study, controlled fabrication of three‐dimensional (3D) metal oxide nanowire networks is demonstrated that can greatly improve both signal stability and sensor response compared to random nanowire arrays. For example, the highest ever reported H 2 S gas response value, and a 5 times lower relative standard deviation of baseline resistance than that of random nanowires assemblies, are achieved with the ordered 3D nanowire network. Systematic engineering of 3D geometries and their modeling, utilizing equivalent circuit components, provide additional insights into the electrical conduction and gas‐sensing response of 3D assemblies, revealing the critical importance of wire‐to‐wire junction points and their arrangement. These findings suggest new design rules for both enhanced performance and reliability of chemical sensors, which may also be extended to other devices based on nanoscale building blocks.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF)
- Grant/Contract Number:
- SC0002633; NRF-2019R1A2C2086240
- OSTI ID:
- 1976182
- Alternate ID(s):
- OSTI ID: 1829406
- Journal Information:
- Advanced Functional Materials, Vol. 32, Issue 10; ISSN 1616-301X
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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