High-sensitive NO2 sensor based on p-NiCo2O4/n-WO3 heterojunctions

Hu, Yaqing; Li, Tingting; Zhang, Jianhua; Guo, Jingyu; Wang, Weiwei; Zhang, Dongzhi

doi:10.1016/j.snb.2021.130912

Cited by 79 publications

(36 citation statements)

References 55 publications

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“…The high surface area of the WM sensor along with the highly conducting Ti 3 C 2 T x platform aids the adsorption sites for gas molecules and eases charge carrier conduction throughout the sensing process, thus improving the sensing performance. Further, the creation of heterojunctions using WO 3 (4.8 eV) and Ti 3 C 2 T x (3.9 eV) resulted in the formation of a Schottky barrier with n-type response behavior, thus creating a depletion layer containing a hole accumulation layer (HAL) and electron depletion layer (EDL) at the interfaces (Figure ). Atmospheric oxygen (dry air) adsorbs at the surface of EDL and HAL in the WM nanocomposite, according to the following reactions and : The electrons at the surface of WO 3 NRs in the WM nanocomposite are trapped by the adsorbed oxygen, resulting in a wider EDL.…”

Section: Resultsmentioning

confidence: 99%

Development of Highly Sensitive and Humidity Independent Room Temeprature NO₂ Gas Sensor Using Two Dimensional Ti₃C₂T_x Nanosheets and One Dimensional WO₃ Nanorods Nanocomposite

Gasso

Mahajan

2022

ACS Sens.

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Room temperature gas sensors have been widely explored in gas sensor technology for real-time applications. However, humidity has found to affect the room temperature sensing and the sensor life, necessitating the development of novel sensing materials with high sensitivity and stability under humid conditions at room temperature. In this work, the room temperature sensing performance of a Ti 3 C 2 T x decorated, WO 3 nanorods based nanocomposite has been investigated. The hydrothermally synthesized WO 3 / Ti 3 C 2 T x nanocomposite has been investigated for structural, morphological, and electrical studies using X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, and Brunanuer−Emmett− Teller techniques. The WO 3 /Ti 3 C 2 T x sensors have been found to be highly selective to NO 2 at room temperature and exhibit much higher sensitivity in comparison to pristine WO 3 nanorods. Furthermore, sodium L-ascorbate treated Ti 3 C 2 T x sheets in WO 3 /Ti 3 C 2 T x enhanced the stability and reversibility of the sensor toward NO 2 even under variable humidity conditions (0−99% relative humidity). This study shows the potential room temperature sensing application of a WO 3 / Ti 3 C 2 T x nanocomposite-based sensor for detecting NO 2 at sub-ppb level. Further, a plausible sensing mechanism based on WO 3 / Ti 3 C 2 T x nanocomposite has been proposed to explain the improved sensing characteristics.

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Section: Resultsmentioning

confidence: 99%

Development of Highly Sensitive and Humidity Independent Room Temeprature NO₂ Gas Sensor Using Two Dimensional Ti₃C₂T_x Nanosheets and One Dimensional WO₃ Nanorods Nanocomposite

Gasso

Mahajan

2022

ACS Sens.

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“…Gas sensors have become a fundamental need to determine dangerous gases (such as NO 2 , CO 2 , H 2 S, SO 2 , NH 3 , H 2 , CH 4 , and so on). Many metal oxides, , metal dichalcogenides, metal sulfides, and other materials have been used as gas-sensing materials . Also, 2D materials, such as metal dichalcogenides, have significantly impacted gas-sensing applications because of their excellent gas-sensing performance in terms of low operating temperature, higher sensitivity, and low power consumption .…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent n–p–n Switching and Highly Selective Room-Temperature n-SnSe₂/p-SnO/n-SnSe Heterojunction-Based NO₂ Gas Sensor

Rani

Kumar

Garg

et al. 2022

ACS Appl. Mater. Interfaces

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Many toxic gases are mixed into the atmosphere because of increased air pollution. An efficient gas sensor is required to detect these poisonous gases with its ultrasensitive ability. We employed the thermal evaporation method to deposit an n-SnSe2/p-SnO/n-SnSe heterojunction and observed a temperature-dependent n–p–n switching NO2 gas sensor with high selectivity working at room temperature (RT). The structural and morphological properties of the material were studied using the characterization techniques such as XRD, SEM, Raman spectroscopy, XPS, and HRTEM, respectively. At RT, the device response was 256% for 5 ppm NO2. The response/recovery times were 34 s/272 s, respectively. The calculated limit of detection (LOD) was ∼115 ppb with a 38% response. The device response was better with NO2 gas than with SO2, NO, H2S, CO, H2, and NH3. The mechanism of temperature-dependent n–p–n switching, fast response, recovery, and selective detection of NO2 at RT has been discussed on the basis of physisorption and charge transfer. Thus, this work will add a new dimension to 2D materials as selective gas detectors at room temperature.

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“…In these harmful gases, nitrogen dioxide (NO 2 ) causes severe health challenges and environmental pollution. , The World Health Organization included NO 2 into a list of the most dangerous yet common pollutants. NO 2 is a reddish-brown, flammable, explosive, and irritating gas . Several studies have shown that prolonged exposure to low concentrations of NO 2 can cause respiratory tract infection, which can result in the inflammation of the throat and nose, leading to dizziness, and nausea. , In more severe cases, poisoning with NO 2 causes serious life-threatening emphysema, asthma, bronchitis, and lung cancer.…”

Section: Introductionmentioning

confidence: 99%

Au-WO₃ Nanowire-Based Electrodes for NO₂ Sensing

Lin

Wang

et al. 2022

ACS Appl. Nano Mater.

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In this work, a selective and highly sensitive gas sensor using tungsten oxide (WO 3 ) nanofibers was fabricated via electrospinning. WO 3 was functionalized with gold nanoparticles by magnetron sputtering at different sputtering times to obtain Au films with thicknesses of 1, 5, 10, and 15 nm. The sensing performance of Au film composite nanomaterials with different Au layer thicknesses was tested at 100−250 °C and different nitrogen dioxide (NO 2 ) concentrations ranging from 200 to 1000 ppb. The findings showed that the 10 nm Au−WO 3 composite nanomaterial sensor had the most significant improvement in the performance of the pristine WO 3 sensor compared with other Au−WO 3 composite nanomaterial sensors, and the optimal operating temperature of the sensor was 175 °C. The composite nanomaterial sensor exhibited excellent selectivity when exposed to different gases and also exhibited high sensibility when exposed to low concentrations of NO 2 under high humidity (80%). The mechanism of gas sensor performance improvement was also investigated.

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High-sensitive NO2 sensor based on p-NiCo2O4/n-WO3 heterojunctions

Cited by 79 publications

References 55 publications

Development of Highly Sensitive and Humidity Independent Room Temeprature NO₂ Gas Sensor Using Two Dimensional Ti₃C₂T_x Nanosheets and One Dimensional WO₃ Nanorods Nanocomposite

Development of Highly Sensitive and Humidity Independent Room Temeprature NO₂ Gas Sensor Using Two Dimensional Ti₃C₂T_x Nanosheets and One Dimensional WO₃ Nanorods Nanocomposite

Temperature-Dependent n–p–n Switching and Highly Selective Room-Temperature n-SnSe₂/p-SnO/n-SnSe Heterojunction-Based NO₂ Gas Sensor

Au-WO₃ Nanowire-Based Electrodes for NO₂ Sensing

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High-sensitive NO2 sensor based on p-NiCo2O4/n-WO3 heterojunctions

Cited by 79 publications

References 55 publications

Development of Highly Sensitive and Humidity Independent Room Temeprature NO2 Gas Sensor Using Two Dimensional Ti3C2Tx Nanosheets and One Dimensional WO3 Nanorods Nanocomposite

Development of Highly Sensitive and Humidity Independent Room Temeprature NO2 Gas Sensor Using Two Dimensional Ti3C2Tx Nanosheets and One Dimensional WO3 Nanorods Nanocomposite

Temperature-Dependent n–p–n Switching and Highly Selective Room-Temperature n-SnSe2/p-SnO/n-SnSe Heterojunction-Based NO2 Gas Sensor

Au-WO3 Nanowire-Based Electrodes for NO2 Sensing

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Development of Highly Sensitive and Humidity Independent Room Temeprature NO₂ Gas Sensor Using Two Dimensional Ti₃C₂T_x Nanosheets and One Dimensional WO₃ Nanorods Nanocomposite

Development of Highly Sensitive and Humidity Independent Room Temeprature NO₂ Gas Sensor Using Two Dimensional Ti₃C₂T_x Nanosheets and One Dimensional WO₃ Nanorods Nanocomposite

Temperature-Dependent n–p–n Switching and Highly Selective Room-Temperature n-SnSe₂/p-SnO/n-SnSe Heterojunction-Based NO₂ Gas Sensor

Au-WO₃ Nanowire-Based Electrodes for NO₂ Sensing