Highly enhanced NO2 sensing performances of Cu-doped In2O3 hierarchical flowers

Hu, Xiaolong; Tian, Liyuan; Sun, Hongbin; Wang, Biao; Gao, Yuan; Sun, Peng; Liu, Fengmin; Lu, Geyu

doi:10.1016/j.snb.2015.06.080

Cited by 41 publications

(10 citation statements)

References 41 publications

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“…Semiconductor metal oxide gas sensors are widely applied in volatile organic compounds (VOCs) detection because of their simplicity in operation, low cost, high sensitivity, and fast response speed. − As an important semiconductor-sensing material, In 2 O 3 has been widely used in gas sensors because of its wide band gap, small resistivity, excellent optoelectronic properties, and high stability. − Although various methods, such as element doping − and morphology controlling, − have already been used to enhance the gas-sensing properties, developing an effective strategy for improving the sensing performance of In 2 O 3 is attracting much attention.…”

Section: Introductionmentioning

confidence: 99%

Manipulating the Defect Structure (V_O) of In₂O₃ Nanoparticles for Enhancement of Formaldehyde Detection

Han

et al. 2017

ACS Appl. Mater. Interfaces

165

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Because defects such as oxygen vacancies (V) can affect the properties of nanomaterials, investigating the defect structure-function relationship are attracting intense attention. However, it remains an enormous challenge to the synthesis of nanomaterials with high sensing performance by manipulating V because understanding the role of surface or bulk V on the sensing properties of metal oxides is still missing. Herein, InO nanoparticles with different contents of surface and bulk V were obtained by hydrogen reduction treatment, and the role of surface or bulk V on the sensing properties of InO was investigated. The X-ray diffraction, ultraviolet-visible spectrophotometer, electron paramagnetic resonance, photoluminescence, Raman, X-ray photoelectron spectroscopy, Hall analysis, and the sensing results indicate that bulk V can decrease the band gap and energy barrier and increase the carrier mobility, hence facilitating the formation of chemisorbed oxygen and enhancing the sensing response. Benefiting from bulk V, InO-H10 exhibits the highest response, good selectivity, and stability for formaldehyde detection. However, surface V does not contribute to the improvement of formaldehyde-sensing performance, and the black InO-H30 with the highest content of surface V exhibits the lowest response. Our work provides a novel strategy for the synthesis of nanomaterials with high sensing performance by manipulating V.

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Section: Introductionmentioning

confidence: 99%

Manipulating the Defect Structure (V_O) of In₂O₃ Nanoparticles for Enhancement of Formaldehyde Detection

Han

et al. 2017

ACS Appl. Mater. Interfaces

165

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“…form through the oxygen deficiencies, which are mainly for NO 2 chemisorption. Once the NO 2 chemisorption occurs, the bond is formed between the active sites and orbital of NO 2 and shares the electrons effectively [15,44]. Thus, the resistance of In 2 O 3 increases with respect to increasing adsorption of NO 2 .…”

Section: Gas Sensing Mechanismmentioning

confidence: 99%

“…It is an ideal gas sensing material, especially in the detection of NO 2 gas due to its higher affinity (2.28 eV) of NO 2 than pre-adsorbed oxygen (0.43 eV), high electrical conductivity, chemical stability and intrinsic defects [14]. In 2 O 3 is an n-type direct band gap semiconductor originated from the oxygen vacancies (abundance dynamic sites) present on its surface, which act as donor levels to provide free electrons to the conduction band of In 2 O 3 and hence, increases the adsorption of NO 2 [15][16][17]. So, various In 2 O 3 -based sensors have been explored for NO 2 gas sensing [18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Ultra-high sensitive and ultra-low NO2 detection at low-temperature based on ultrathin In2O3 nanosheets

Cao¹,

Chen²,

Cai³

et al. 2021

J Mater Sci: Mater Electron

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In this study, the high oxygen vacancy-rich ultrathin indium oxide (In 2 O 3 ) nanosheets are synthesized by low-cost and environmental-friendly solvothermal method. The gas sensing properties of In 2 O 3 nanosheets to low concentration of nitrogen dioxide (NO 2 ) (concentration in 5 ppb to 5 ppm) at 50 °C are investigated. All In 2 O 3 samples are successfully characterized using various techniques to obtain the information related to phase, morphological, oxygen vacancies, and surface area, etc. It is observed that among all the samples, the In 2 O 3 -350 exhibited benchmarked response of around 3223 at 2 ppm NO 2 gas, with theoretical detection limit down to ppb level. The sensor has shown superior sensing characteristics, such as wide sensing bandwidth, excellent selectivity, high long-term stability, and good repeatability. It is considered that the high oxygen deficiency present on In 2 O 3 nanosheets acts as favorable reaction sites for such remarkable sensing performance, and therefore, these improved gas-sensing properties make the In 2 O 3 nanosheets suitable to detect NO 2 at low-temperature.

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“…Unfortunately, the pure In 2 O 3 as sensing material possessing simply poor selectivity and a high response can hardly be obtained at low temperatures, which restricts its further application. To further enhance its sensing properties, In 2 O 3 has been modified by noble metals [36], metal ions [37], and carbon materials [38]. Composites of multi-phase semiconducting metal oxide nanostructures have also been frequently reported [39].…”

Section: Introductionmentioning

confidence: 99%

Ag Nanoparticles Sensitized In2O3 Nanograin for the Ultrasensitive HCHO Detection at Room Temperature

Zhou

Chen²,

et al. 2019

Nanoscale Res Lett

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Formaldehyde (HCHO) is the main source of indoor air pollutant. HCHO sensors are therefore of paramount importance for timely detection in daily life. However, existing sensors do not meet the stringent performance targets, while deactivation due to sensing detection at room temperature, for example, at extremely low concentration of formaldehyde (especially lower than 0.08 ppm), is a widely unsolved problem. Herein, we present the Ag nanoparticles (Ag NPs) sensitized dispersed In2O3 nanograin via a low-fabrication-cost hydrothermal strategy, where the Ag NPs reduces the apparent activation energy for HCHO transporting into and out of the In2O3 nanoparticles, while low concentrations detection at low working temperature is realized. The pristine In2O3 exhibits a sluggish response (Ra/Rg = 4.14 to 10 ppm) with incomplete recovery to HCHO gas. After Ag functionalization, the 5%Ag-In2O3 sensor shows a dramatically enhanced response (135) with a short response time (102 s) and recovery time (157 s) to 1 ppm HCHO gas at 30 °C, which benefits from the Ag NPs that electronically and chemically sensitize the crystal In2O3 nanograin, greatly enhancing the selectivity and sensitivity.

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Highly enhanced NO2 sensing performances of Cu-doped In2O3 hierarchical flowers

Cited by 41 publications

References 41 publications

Manipulating the Defect Structure (V_O) of In₂O₃ Nanoparticles for Enhancement of Formaldehyde Detection

Manipulating the Defect Structure (V_O) of In₂O₃ Nanoparticles for Enhancement of Formaldehyde Detection

Ultra-high sensitive and ultra-low NO2 detection at low-temperature based on ultrathin In2O3 nanosheets

Ag Nanoparticles Sensitized In2O3 Nanograin for the Ultrasensitive HCHO Detection at Room Temperature

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Highly enhanced NO2 sensing performances of Cu-doped In2O3 hierarchical flowers

Cited by 41 publications

References 41 publications

Manipulating the Defect Structure (VO) of In2O3 Nanoparticles for Enhancement of Formaldehyde Detection

Manipulating the Defect Structure (VO) of In2O3 Nanoparticles for Enhancement of Formaldehyde Detection

Ultra-high sensitive and ultra-low NO2 detection at low-temperature based on ultrathin In2O3 nanosheets

Ag Nanoparticles Sensitized In2O3 Nanograin for the Ultrasensitive HCHO Detection at Room Temperature

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Manipulating the Defect Structure (V_O) of In₂O₃ Nanoparticles for Enhancement of Formaldehyde Detection

Manipulating the Defect Structure (V_O) of In₂O₃ Nanoparticles for Enhancement of Formaldehyde Detection