Construction of Flower-like PtO_x@ZnO/In₂O₃ Hollow Microspheres for Ultrasensitive and Rapid Trace Detection of Isopropanol

Abstract

The design of a highly effective isopropanol gas sensor with high response and trace detection capability is extremely important for environmental surveillance and human health. Here, novel flower-like PtO x @ZnO/In2O3 hollow microspheres were prepared by a three-step approach. The hollow structure was composed of an In2O3 shell inside and layered ZnO/In2O3 nanosheets outside with PtO x nanoparticles (NPs) on the surface. Meanwhile, the gas sensing performances of the ZnO/In2O3 composite with different Zn/In ratios and PtO x @ZnO/In2O3 composites were evaluated and compared systematically. The measurement results indicated that the ratio of Zn/In affected the sensing performance and the ZnIn2 sensor presented a higher response, which was then modified with PtO x NPs to further enhance its sensing property. The Pt@ZnIn2 sensor exhibited outstanding isopropanol detection performance with ultrahigh response values under 22 and 95% relative humidity (RH). In addition, it also showed a rapid response/recovery speed, good linearity, and low theoretical limit of detection (LOD) regardless of being under a relatively dry or ultrahumid atmosphere. The enhancement of isopropanol sensing properties might be ascribed to the unique structure of PtO x @ZnO/In2O3, heterojunctions between the components, and catalytic effect of Pt NPs.

Synergistic Effect of ZIF-8 and Pt-Functionalized NiO/In2O3 Hollow Nanofibers for Highly Sensitive Detection of Formaldehyde

“…The Pt NPs facilitate the dissociation of O 2 molecules into adsorbed oxygen (O − ) through the "spillover effect", increasing the concentration of adsorbed oxygen (Figure 5c). Therefore, ZPNiIn possessed more surface-adsorbed oxygen, which is favorable to promote the active sites for enhancing the gas-sensing properties [48]. The characterization results of XPS also confirmed that the adsorbed oxygen content of ZPNiIn increased (Table S1).…”

Pt-Embedded Metal–Organic Frameworks Deriving Pt/ZnO-In2O3 Electrospun Hollow Nanofibers for Enhanced Formaldehyde Gas Sensing

“…As the Pt content increased to 0.25 and 0.50 wt%, the peaks of 25PtZI and 50Pt samples at 39.76, 46.24, and 67.45° confirm the existence of Pt NPs (111), (200), and (22 (JCPDS No. 04-0802) planes [32], respectively. To substantiate the synergetic crystalline structure, the FT-IR measurement was employed for the as-synthesized samples.…”

Facile Surface Engineering of TiO2 Nanosheets for Enhanced Isopropanol Sensing under UV Irradiation

“…The extensive use of IPA may cause damage to the eyes, respiratory tract, kidneys, and central nervous system. 4 Moreover, IPA has also been proposed as one of the biomarkers in breath analysis for the detection of lung cancer. 5 The traditional approach to detect IPA is gas chromatography (GC), which separates the gaseous components based on the differential retention properties of the chromatographic column for different components and then quantifies the content through a detector.…”

“…IPA is also used as a disinfectant against viruses and became popular during the COVID-19 pandemic. The extensive use of IPA may cause damage to the eyes, respiratory tract, kidneys, and central nervous system . Moreover, IPA has also been proposed as one of the biomarkers in breath analysis for the detection of lung cancer .…”