Gigantically enhanced NO sensing properties of WO3/SnO2 double layer sensors with Pd decoration

Li, Huayao; Cai, Ze-Xing; Ding, Jiaqi; Guo, Xin

doi:10.1016/j.snb.2015.05.091

Cited by 44 publications

(16 citation statements)

References 54 publications

(63 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tungsten oxide has been established as one of the most sensitive materials for NO 2 sensors [1,2,10,11]. Numerous works demonstrate the advantageous sensitivity and selectivity of WO 3 -based sensors to NO [2,6,12,13,14]. WO 3 is an n -type semiconductor with a bandgap width of 2.62 eV [15].…”

Section: Introductionmentioning

confidence: 99%

Quasi Similar Routes of NO2 and NO Sensing by Nanocrystalline WO3: Evidence by In Situ DRIFT Spectroscopy

Yang

Marikutsa

Rumyantseva

et al. 2019

Sensors

View full text Add to dashboard Cite

Tungsten oxide is a renowned material for resistive type gas sensors with high sensitivity to nitrogen oxides. Most studies have been focused on sensing applications of WO3 for the detection of NO2 and a sensing mechanism has been established. However, less is known about NO sensing routes. There is disagreement on whether NO is detected as an oxidizing or reducing gas, due to the ambivalent redox behavior of nitric oxide. In this work, nanocrystalline WO3 with different particle size was synthesized by aqueous deposition of tungstic acid and heat treatment. A high sensitivity to NO2 and NO and low cross-sensitivities to interfering gases were established by DC-resistance measurements of WO3 sensors. Both nitrogen oxides were detected as the oxidizing gases. Sensor signals increased with the decrease of WO3 particle size and had similar dependence on temperature and humidity. By means of in situ infrared (DRIFT) spectroscopy similar interaction routes of NO2 and NO with the surface of tungsten oxide were unveiled. Analysis of the effect of reaction conditions on sensor signals and infrared spectra led to the conclusion that the interaction of WO3 surface with NO was independent of gas-phase oxidation to NO2.

show abstract

Section: Introductionmentioning

confidence: 99%

Quasi Similar Routes of NO2 and NO Sensing by Nanocrystalline WO3: Evidence by In Situ DRIFT Spectroscopy

Yang

Marikutsa

Rumyantseva

et al. 2019

Sensors

View full text Add to dashboard Cite

show abstract

“…Therefore, numerous efforts have been so far directed to developing various types of NO2-sensing devices such as solid electrochemical [6][7][8], optical [9,10], and acoustic sensors [11,12]. Among them, it is well known that semiconductor gas sensors show relatively large sensitivity and excellent selectivity to NO2 at elevated temperatures, and SnO2 [13][14][15][16], In2O3 [17][18][19], WO3 [20][21][22][23], and the related materials are especially promising candidates as the NO2-sensing materials, among all the oxide semiconductors. However, the operation of these semiconductor gas sensors at elevated temperatures causes sintering among oxide particles and the grain growth involved, leading to reduction in the NO2 sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Semiconductor-type SnO2-based NO2 sensors operated at room temperature under UV-light irradiation

Hyodo

Urata

Kamada

et al. 2017

Sensors and Actuators B: Chemical

View full text Add to dashboard Cite

NO2-sensing properties of typical oxide (SnO2, In2O3, or WO3)-based semiconductor gas sensors were measured at 30°C with and without UV-light irradiation (main wavelength: 365 nm), and effects of noble-metal (Pd or Pt) loading, UV-light intensity (0-134 mW cm −2) and relative humidity in target gas (0-80%RH) on their NO2-sensing properties were investigated in this study. The UV-light irradiation effectively reduced the resistances of all sensors, enhanced their NO2 responses in some cases, and tended to accelerate their response and recovery speeds in dry air, because the UV-light irradiation promoted the adsorption and desorption of NO2-species on the surface. The SnO2 sensor showed the largest NO2 response in dry air, among all the pristine oxide sensors, especially under weak UV-light irradiation (≤ 35 mW cm −2), together with relatively fast response and recovery speeds. The Pd or Pt loading onto SnO2 enhanced the NO2 response of the SnO2 sensor and accelerated their response and recovery speeds in dry air, while XPS analysis indicated that most of the Pd and Pt nanoparticles loaded on the surface were oxidized after heat treatment at 500°C. Among all the sensors, the 0.05 wt% Pd-loaded SnO2 sensor showed the largest NO2 response under weak UV-light irradiation (≤ 35 mW cm −2), together with relatively fast response and recovery speeds. The addition of moisture to the target gas had adverse effects on the NO2 responses and the response speeds of the SnO2 and 0.05 wt% Pd-loaded SnO2 sensors, but the weak UV-light irradiation (7 mW cm −2) largely reduced the dependence of the NO2 response of the 0.05Pd/SnO2 sensor on relative humidity while maintaining the large NO2 response, probably because the weak UVlight irradiation promotes the desorption of physisorbed water molecules and then the effective adsorption of NO2 on the 0.05Pd/SnO2 surface.

show abstract

“…Many efforts have been made to enhance the selectivity, including the modulation of the sensor temperature, 12 the loading of noble-metal catalysts, 13,14 the doping of catalytic oxides, 15,16 and control of acid-base interactions. 17,18 Although pattern recognition using an array of sensors is one solution for gas discrimination, the number of sensors should be minimized to reduce the size, cost, power consumption, and sensing circuit of devices. 19,20 From this viewpoint, the detection of multiple gases using a single sensor is the ideal approach for realizing simple and reliable gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Molybdenum trioxide nanopaper as a dual gas sensor for detecting trimethylamine and hydrogen sulfide

Huang

Wang

et al. 2017

RSC Adv.

Self Cite

View full text Add to dashboard Cite

show abstract

Gigantically enhanced NO sensing properties of WO3/SnO2 double layer sensors with Pd decoration

Cited by 44 publications

References 54 publications

Quasi Similar Routes of NO2 and NO Sensing by Nanocrystalline WO3: Evidence by In Situ DRIFT Spectroscopy

Quasi Similar Routes of NO2 and NO Sensing by Nanocrystalline WO3: Evidence by In Situ DRIFT Spectroscopy

Semiconductor-type SnO2-based NO2 sensors operated at room temperature under UV-light irradiation

Molybdenum trioxide nanopaper as a dual gas sensor for detecting trimethylamine and hydrogen sulfide

Contact Info

Product

Resources

About