Highly sensitive ZnO nanoparticles-loaded In2O3 hollow microsphere for detecting ppb-level NO2 at low working temperature

Zhang, Chao; Sun, Dongjin; Huan, Yuchun; Wu, Kaidi; Liao, Hanlin

doi:10.1016/j.pnsc.2020.06.006

Cited by 18 publications

(3 citation statements)

References 29 publications

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“…(e) PULM dynamic response to trace (20–1000 ppb) NO 2 under the optimized UV waveform ( t on = 15 s, t off = 70 s) and the optimal UV intensity of 1.6 mW/cm 2 . (f) Comparison of NO 2 response under PULM, CU, and literature (see Table S1 for the detailed information). − …”

Section: Resultsmentioning

confidence: 99%

Decoupling the Conflicting Roles of Photoactivation and Boosting Chemiresistor Response by Pulsed UV Light Modulation

Mi,

Deng,

Chang

et al. 2023

ACS Appl. Mater. Interfaces

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UV photoactivation has been widely employed to trigger the response of semiconductor chemiresistors at room temperature (RT). Generally, continuous UV (CU) irradiation is applied, and an apparent maximal response could be obtained via optimizing UV intensity. However, owing to the conflicting roles of (UV) photoactivation in the gas response process, we do not think the potential of photoactivation has been fully explored. Herein, a pulsed UV light modulation (PULM) photoactivation protocol has been proposed. Pulsed UV-on facilitates the generation of surface reactive oxygen species and refreshes the surface of chemiresistors, while pulsed UV-off avoids the side effects of UVinduced desorption of the target gas and the decline of base resistance. PULM enables decoupling those conflicting roles of CU photoactivation, resulting in a drastic boost of response to trace (20 ppb) NO 2 from 1.9 (CU) to 131.1 (PULM UV-off), and a decline of limit of detection from 2.6 ppb (CU) to 0.8 ppb (PULM) for a ZnO chemiresistor. This work highlights that PULM allows full exploitation of the potential of nanomaterials for sensitively detecting trace (ppb-level) toxic gas molecules and opens a new opportunity for designing highly sensitive, low-power consumed RT chemiresistors for ambient air quality monitoring.

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Section: Resultsmentioning

confidence: 99%

Decoupling the Conflicting Roles of Photoactivation and Boosting Chemiresistor Response by Pulsed UV Light Modulation

Mi,

Deng,

Chang

et al. 2023

ACS Appl. Mater. Interfaces

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“…In general, increasing the Ag at% (< 5 at%) is beneficial for producing more active sites and expanding the electron depletion layer of the sensor. However, excessive Ag clusters on the surface will decrease the number of chemical adsorption sites and thicken the hollow sphere shell, which is not conducive to the spread of gas molecules [42,63]. So the sensor response begins to decrease after the Ag/In atomic ratio exceeds 5%.…”

Section: Gas Sensing Mechanismmentioning

confidence: 99%

Low concentration isopropanol gas sensing properties of Ag nanoparticles decorated In2O3 hollow spheres

et al. 2022

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In order to detect low concentrations of volatile organic compounds (VOCs) for the early diagnosis of lung cancer, sensors based on hollow spheres of In2O3 were prepared through the soft template method. Ag nanoparticle decorated In2O3 composites were synthesized via dipping and annealing. The microstructure, phase composition, element distribution, and state of Ag were analyzed by the scanning electron microscopy (SEM), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). The gas sensing tests showed that Ag-In2O3 sensors had the highest response to isopropanol at 300 °C. The best response of Ag-In2O3 composite sensor was 5.2, which had a significant improvement compared with only In2O3. Moreover, the response and recovery time of Ag-In2O3 composite sensor was significantly shortened. The improved sensing properties of Ag-In2O3 composite sensor could be attributed to the Schottky barrier created at Ag-In2O3 interface and catalytical effect of Ag.

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“…Common methods to improve gas sensing properties of ZnO include heterojunctions construction and precious metal doping [ 14 ]. Due to its two-dimensional structure and excellent electronic transport properties, MoSe 2 has been widely researched in the literature.…”

Section: Introductionmentioning

confidence: 99%

Ag-Doped MoSe2/ZnO Heterojunctions: A Highly Responsive Gas-Sensitive Material for Selective Detection of NO Based on DFT Study

He,

Liu,

Zhang

et al. 2023

Nanomaterials

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In this work, the adsorption and sensing behavior of Ag-doped MoSe2/ZnO heterojunctions for H2, CH4, CO2, NO, CO, and C2H4 have been studied based on density functional theory (DFT). In gas adsorption analysis, the adsorption energy, adsorption distance, transfer charge, total electron density, density of states (DOS), energy band structure, frontier molecular orbital, and work function (WF) of each gas has been calculated. Furthermore, the reusability and stability of the Ag-doped MoSe2/ZnO heterojunctions have also been studied. The results showed that Ag-doped MoSe2/ZnO heterojunctions have great potential to be a candidate of highly selective and responsive gas sensors for NO detection with excellent reusability and stability.

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Highly sensitive ZnO nanoparticles-loaded In2O3 hollow microsphere for detecting ppb-level NO2 at low working temperature

Cited by 18 publications

References 29 publications

Decoupling the Conflicting Roles of Photoactivation and Boosting Chemiresistor Response by Pulsed UV Light Modulation

Decoupling the Conflicting Roles of Photoactivation and Boosting Chemiresistor Response by Pulsed UV Light Modulation

Low concentration isopropanol gas sensing properties of Ag nanoparticles decorated In2O3 hollow spheres

Ag-Doped MoSe2/ZnO Heterojunctions: A Highly Responsive Gas-Sensitive Material for Selective Detection of NO Based on DFT Study

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