Oxygen vacancies and grain boundaries potential barriers modulation facilitated formaldehyde gas sensing performances for In2O3 hierarchical architectures

Wang, Shuangming; Cao, Jing; Cui, Wen; Fan, Longlong; Li, Xifei; Li, Dejun

doi:10.1016/j.snb.2017.08.054

Cited by 149 publications

(40 citation statements)

References 51 publications

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“…The small band gap energy facilitates the electron transition, so In 2 O 3 ‐500 nanoparticles may have more free electrons than the other samples, which will attract more absorbed oxygen species. The decrease of E g results from the increase of oxygen vacancies . The oxygen vacancies act as electron donors and lead to the formation of new energy levels which could contribute to the sensing performance .…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of In₂O₃ nanoparticles with high response to formaldehyde at low temperature

Wang

Zhang

et al. 2019

Int J Applied Ceramic Tech

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In 2 O 3 nanoparticles with uniform particle size (10-25 nm) were obtained using the facile precipitation strategy at room temperature with following calcined treatment.The gas-sensing performance of In 2 O 3 nanoparticles with different calcined temperatures was investigated. The results demonstrated that the In 2 O 3 nanoparticles calcined at 500°C exhibited highest sensing response (R a /R g = 68.1) to 10 ppm HCHO at 100°C with good selectivity, stability, reproducibility, and ultra-low limit of detection (1 ppm). The results of XPS, UV, and other characterizations indicated that In 2 O 3 -500 possessed the most absorbed oxygen species, the highest carrier mobility, and lowest band gap energies. Our work offers new insights into the development of sensing materials to the detection of volatile organic compounds (VOCs). K E Y W O R D Scalcined temperature, gas sensing, HCHO, In 2 O 3

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Section: Resultsmentioning

confidence: 99%

Facile synthesis of In₂O₃ nanoparticles with high response to formaldehyde at low temperature

Wang

Zhang

et al. 2019

Int J Applied Ceramic Tech

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“…The most popular and widely accepted gas sensing mechanism of semiconducting oxides sensors is that adsorption and desorption of target gas molecules on the surface of sensing materials can effectively cause the resistance change of sensor devices . The typical testing ethanol sensing reactions at near‐room temperature can be expressed as follows

{normalO}_{2} (normalgas) \to {normalO}_{2} (normalphys) \to {normalO}_{2}^{-} (normalchem)

{normalC}_{2} {normalH}_{5} OH \to {CH}_{3} CHO + {normalH}_{2}

2 {CH}_{3} CHO (normalad) + 5 {normalO}_{2}^{-} \to 4 {CO}_{2} + 4 {normalH}_{2} O + 5 {normale}^{-}

…”

Section: Resultsmentioning

confidence: 99%

Near‐Room‐Temperature Ethanol Gas Sensor Based on Mesoporous Ag/Zn–LaFeO₃ Nanocomposite

Chen

Wang

et al. 2018

Adv Materials Inter

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detecting ethanol along with response of 53 (50 ppm) at 275 °C. [6] Mesoscale porosity makes a significant contribution to obtaining high response in MOS because of the facile penetration of gas molecules. [7] A number of efforts have been made to synthesize mesoporous materials, [8][9][10][11] one of which involved the nanocast mesostructured metal oxides synthesized by hard template. Compared to soft template and sacrificial colloidal template methods, the hard template can provide a relatively stable matrix during heat treatment over a larger temperature range, as a result, it helps MOS show higher crystallinity. [12] Recently, it has been reported that hetero nanostructures consisting of two or more components with noble metals decorated can improve the sensing performance. [13,14] To improve the gas sensing performance of metal oxides, noble metals, such as Ag, Pd, Pt, and Au are commonly regarded as catalyst, especially, Ag is able to weaken the adsorption and the desorption energy of ethanol molecules on the surface by promoting the electron conduction properties, [15] thus it enables the analyte to access the activated surface. Perovskite type (ABO 3 , where A is rare earth and B is transition metal) MOS have attracted considerable attentions in applications of catalysis, [16] renewable energy storage, [17] and gas sensors [18] due to their numerous favorable physical/chemical properties. Among various perovskite type materials, LaFeO 3 shows considerably sensitive to reducing gases such as ethanol, [19] acetone, [20] and formaldehyde. [21] However, pure LaFeO 3 have some deficiencies such as high resistance, high working temperature, and poor selectivity. Ag/LaFeO 3 has been investigated to detect VOCs at low temperature (<200 °C) according to our previous work. Zhang et al. reported Ag/LaFeO 3 showed excellent gassensing properties to formaldehyde gas. At the optimal working temperature of 90 °C, the response of the sensor to 1 ppm formaldehyde is 25. [22] In addition, it was reported that the substitution of La 3+ in the LaFeO 3 compound by the lower-valent cations, such as Mg 2+ , [23] Ba 2+ , [24] Ca 2+ , [25] Sr 2+ , [26] and Pb 2+ , [27] could significantly improve gas sensing properties of materials, especially gas response and selectivity.In this study, mesoporous Ag/Zn-LaFeO 3 nanocomposites have been synthesized via a simple nanocasting technique shown in Figure 1. This kind of composite not only possesses a highly active and large surface area for ethanol recognition,The rational design of heterojunction between different metal oxides with mesoporous structures has attracted tremendous attention due to their special physicochemical properties and vital importance for practical applications. In this paper, mesoporous Ag/Zn-LaFeO 3 nanocomposite is successfully synthesized through a facile nanocasting technique using KIT-6 as a hard template in sol-gel route and used as sensing materials to achieve an exceptionally sensitive and selective detection of trace ppm-level ethanol. The obtained compos...

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“…[ 57 ] Emission spectra from PL measurements are usually separated into two components: near‐band edge emission and deep‐level emission, and the latter is usually associated with defects or impurities. [ 57‐58 ] Although the level of information extracted from different studies may vary widely, combined with UV‐vis detection, photoluminescence is commonly used to detect the oxygen defects in the research related to gas sensing. [ 59 ] For example, Liu et al .…”

Section: Characterization Of Oxygen Defects In Nanostructured Metal Oxidesmentioning

confidence: 99%

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges^†

Ding

Liu

et al. 2020

Chin. J. Chem.

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Defect engineering has been the most promising strategy to modulate the surface microstructure and electronic structure of the metal oxides, which will govern the efficiency of a given oxide for the applications in heterogeneous catalysis, energy storage and conversion fields, and gas sensing. This review summarizes recent research advances on understanding the role of oxygen vacancies of the metal oxides in gas sensing. First, different strategies for oxygen vacancy productions are summarized and compared. Then, the proper characterization techniques for oxygen vacancy are introduced. Importantly, the structure-activity relationships between vacancy engineering and gas sensing ability are further illustrated coupling the experimental results and theoretical studies. Finally, the key challenges and prospects regarding defect engineering in gas sensing are highlighted. Wenjie Ding (left) obtained his bachelor degree from Beijing Forestry University in 2018. Currently, he is pursuing his master degree under the supervision of Associate Professor Jiajia Liu in Beijing Instituted of Technology, China. His current research interests mainly focus on the synthesis of nanomaterials for the application of gas sensing. Dr. Jiajia Liu (middle) received her PhD degree in 2010 from Department of Chemical & Biomolecular Engineering of National University of Singapore, Singapore. Currently, she is Associate Professor in School of Materials and Engineering, Beijing Institute of Technology, China. Her current research interest is the development of metal oxide nanostructures and their applications in sensor, catalysis, and optoelectronics. Jiatao Zhang (right) was born in 1975. He earned his PhD from the Department of Chemistry, Tsinghua University, in 2006. Currently, he is Xu Teli Professor in the School of Materials and Engineering, BIT. He was awarded the Excellent Young Scientist foundation of NSFC in 2013. He also serves as the director of Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications. His current research interest is inorganic chemistry of semiconductor-based hybrid nanostructures with novel optical, electronic properties for the applications in energy conversion and storage, catalysis, optoelectronics and biology.

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Oxygen vacancies and grain boundaries potential barriers modulation facilitated formaldehyde gas sensing performances for In2O3 hierarchical architectures

Cited by 149 publications

References 51 publications

Facile synthesis of In₂O₃ nanoparticles with high response to formaldehyde at low temperature

Facile synthesis of In₂O₃ nanoparticles with high response to formaldehyde at low temperature

Near‐Room‐Temperature Ethanol Gas Sensor Based on Mesoporous Ag/Zn–LaFeO₃ Nanocomposite

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges^†

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Oxygen vacancies and grain boundaries potential barriers modulation facilitated formaldehyde gas sensing performances for In2O3 hierarchical architectures

Cited by 149 publications

References 51 publications

Facile synthesis of In2O3 nanoparticles with high response to formaldehyde at low temperature

Facile synthesis of In2O3 nanoparticles with high response to formaldehyde at low temperature

Near‐Room‐Temperature Ethanol Gas Sensor Based on Mesoporous Ag/Zn–LaFeO3 Nanocomposite

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges†

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Product

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Facile synthesis of In₂O₃ nanoparticles with high response to formaldehyde at low temperature

Facile synthesis of In₂O₃ nanoparticles with high response to formaldehyde at low temperature

Near‐Room‐Temperature Ethanol Gas Sensor Based on Mesoporous Ag/Zn–LaFeO₃ Nanocomposite

Oxygen Defects in Nanostructured Metal‐Oxide Gas Sensors: Recent Advances and Challenges^†