| Title |
Metal-Organic Framework-derived Au-ZnO Nanostructures for Ultrasensitive and Selective H2S Gas Detection |
| Authors |
김동현(Donghyeon Kim) ; 박지명(Jimyeong Park) ; 신지연(Jiyeon Shin) ; 홍성훈(Sunghun Hong) ; 김민서(Minseo Kim) ; 한철웅(Chulwoong Han) ; 박성철(Sung Cheol Park) ; 이재형(Jae-Hyoung Lee) ; 최명식(Myung Sik Choi) |
| DOI |
https://doi.org/10.3365/KJMM.2025.63.12.986 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
ZnO nanostructures; Au nanoparticles; Metal-organic framework; Gas sensor; Heterojunction |
| Abstract |
Au-ZnO nanostructures derived from zeolitic imidazolate framework-8 (ZIF-8) were rationally
designed and investigated as highly efficient chemiresistive sensors for detecting H2S gas. The incorporation
of Au nanoparticles markedly enhanced the sensing characteristics relative to pristine ZnO, delivering an
extraordinary response of ~419.1 toward 10 ppm H2S at 200 °C?nearly two orders of magnitude higher than
that of bare ZnO. The optimized Au-ZnO 2 sensor demonstrated excellent selectivity against interfering gases
(NO2, NH3, H2, and volatile organics), fast response/recovery dynamics, and reliable detection down to 0.2
ppm, maintaining stable operation under repeated cycling. Structural and spectroscopic analyses revealed
that Au nanoparticles were uniformly anchored on the porous ZnO surfaces, establishing abundant catalytic
sites and Au-ZnO Schottky junctions that facilitate charge transfer and accelerate surface reactions. The
superior sensing performance arises from the synergistic effects of Au-induced catalytic dissociation, spillover
phenomena, and interfacial electronic modulation within the MOF-derived porous framework. This study
provides a clear structure?performance correlation and demonstrates a scalable strategy for developing noblemetal/
semiconductor hybrid gas sensors with outstanding sensitivity, selectivity, and long-term stability for
practical toxic-gas monitoring applications. |