TY - JOUR
T1 - Selective Reduction Laser Sintering
T2 - A New Strategy for NO2 Gas Detection Based on In2O3 Nanoparticles
AU - Wang, Shaogang
AU - Tan, Chunjian
AU - Zong, Qihang
AU - Li, Shizhen
AU - Gao, Chenshan
AU - Yang, Huiru
AU - Huang, Qianming
AU - French, Paddy
AU - Ye, Huaiyu
PY - 2025
Y1 - 2025
N2 - This study introduces a novel strategy for fabricating flexible nitrogen dioxide (NO2) gas sensors based on Indium Oxide (In2O3) nanoparticles (NPs) employing selective reduction laser sintering (SRLS) technology. The SRSL technology utilizes ultraviolet (UV) laser selective reduction sintering to precisely and rapidly create oxygen vacancy (OV) defects in In2O3 NPs. These oxygen vacancies (OVs) enhance the active adsorption sites and contribute additional free electrons, significantly improving sensor performance at room temperature. The sensors demonstrate excellent response (S = 460.9 at 10 ppm), rapid response/recovery times (τresp/τreco = 27/570 s), and superior selectivity (response ratio > 400), in addition to robust resistance to light and humidity (under ppm-level NO2 gas). The sensors also exhibit a low detection limit (200 ppb), a high signal-to-noise ratio (94.8 dB), and good long-term stability (25 days). Moreover, under photo-assisted conditions, the recovery speed of the sensors is further improved. This technology not only provides an innovative strategy for the development of high-performance flexible NO2 gas sensors but also broadens the application potential of laser direct writing (LDW) technology in advanced materials and sensor fabrications.
AB - This study introduces a novel strategy for fabricating flexible nitrogen dioxide (NO2) gas sensors based on Indium Oxide (In2O3) nanoparticles (NPs) employing selective reduction laser sintering (SRLS) technology. The SRSL technology utilizes ultraviolet (UV) laser selective reduction sintering to precisely and rapidly create oxygen vacancy (OV) defects in In2O3 NPs. These oxygen vacancies (OVs) enhance the active adsorption sites and contribute additional free electrons, significantly improving sensor performance at room temperature. The sensors demonstrate excellent response (S = 460.9 at 10 ppm), rapid response/recovery times (τresp/τreco = 27/570 s), and superior selectivity (response ratio > 400), in addition to robust resistance to light and humidity (under ppm-level NO2 gas). The sensors also exhibit a low detection limit (200 ppb), a high signal-to-noise ratio (94.8 dB), and good long-term stability (25 days). Moreover, under photo-assisted conditions, the recovery speed of the sensors is further improved. This technology not only provides an innovative strategy for the development of high-performance flexible NO2 gas sensors but also broadens the application potential of laser direct writing (LDW) technology in advanced materials and sensor fabrications.
KW - flexible gas sensor
KW - indium oxide nanoparticles
KW - nitrogen dioxide
KW - oxygen vacancy defect
KW - selective reduction laser sintering
UR - http://www.scopus.com/inward/record.url?scp=85216471917&partnerID=8YFLogxK
U2 - 10.1002/adfm.202419057
DO - 10.1002/adfm.202419057
M3 - Article
AN - SCOPUS:85216471917
SN - 1616-301X
JO - Advanced Functional Materials
JF - Advanced Functional Materials
ER -