Journal
SMALL METHODS
Volume 5, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202100202
Keywords
bridged CuO microhemispheres; nanowire arrays; dewetting; photodetector; TMA sensor
Funding
- CAS Pioneer Hundred Talents Program of Chinese Academy of Sciences, National Natural Science Foundation of China [52025028, 11674324, 62075223, 11604339]
- Natural Science Foundation of Top Talent of SZTU [2020101]
- CAS-NSTDA Joint Research Projects [GJHZ202101]
- CAS-JSPS Joint Research Projects [GJHZ1891]
- National Key Laboratory of Quantum Optics and Photonic Devices [KF201901]
- Key Lab of Photovoltaic and Energy Conservation Materials [PECL2018QN001, PECL2019QN005]
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By controlling the use of shadow masks and the thickness of the copper film, the position and spacing of CuO microhemisphere nanowires can be well controlled, allowing for bridging of adjacent nanowires and benefiting highly sensitive TMA sensors and broad band photodetectors. The electrical response of 3.62 to 100 ppm TMA is comparable to state-of-the-art CuO-based sensors, suggesting promising commercial device applications of CuO nanowires through in situ assembly of RB-MNAs device arrays using common lithographic technologies.
Seeking a facile approach to directly assemble bridged metal oxide nanowires on substrates with predefined electrodes without the need for complex postsynthesis alignment and/or device procedures will bridge the gap between fundamental research and practical applications for diverse biochemical sensing, electronic, optoelectronic, and energy storage devices. Herein, regularly bridged CuO microhemisphere nanowire arrays (RB-MNAs) are rationally designed on indium tin oxide electrodes via thermal oxidation of ordered Cu microhemisphere arrays obtained by solid-state dewetting of patterned Ag/Cu/Ag films. Both the position and spacing of CuO microhemisphere nanowires can be well controlled by as-used shadow mask and the thickness of Cu film, which allows homogeneous manipulation of the bridging of adjacent nanowires grown from neighboring CuO hemispheres, and thus benefits highly sensitive trimethylamine (TMA) sensors and broad band (UV-visible to infrared) photodetectors. The electrical response of 3.62 toward 100 ppm TMA is comparable to that of state-of-the-art CuO-based sensors. Together with the feasibility of in situ assembly of RB-MNAs device arrays via common lithographic technologies, this work promises commercial device applications of CuO nanowires.
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