Exposed Mo atoms induced by micropores enhanced H2S sensing of MoO3 nanoflowers

Li, Xiang; Yang, Huimin; Hu, Xiafen; Wu, Qirui; Xiong, Weiqiang; Qin, Ziyu; Xie, Changsheng; Zeng, Dawen

doi:10.1016/j.jhazmat.2022.128270

Cited by 35 publications

(11 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, pure MoO 3 showed a slightly slow response and recovery times of 26.9/43.4 s (Figure k). Different from the tight connections between adjacent MoO 3 nanoflakes, a porous Dy 2 O 3 nanosheets assembly (Figure a) contributed to rapid adsorption and desorption . Benefiting from the incorporation of Dy 2 O 3 nanosheets, both the response and recovery characteristics of the DM0.2 sensor (11.6/2.9 s) were significantly improved with respect to MoO 3 (Figure l).…”

Section: Resultsmentioning

confidence: 99%

2D/2D Dy₂O₃ Nanosheet/MoO₃ Nanoflake Heterostructures for Humidity-Independent and Sensitive Ammonia Detection

Ou,

Zhou,

Guo

et al. 2023

ACS Sens.

View full text Add to dashboard Cite

Chemiresistive ammonia gas (NH 3 ) sensors have been playing a significant role in the fields of environmental protection, food safety monitoring, and air quality evaluation. Nevertheless, balancing the high sensitivity and humidity tolerance remains challenging. Herein, the two-dimensional (2D) heterostructures of molybdenum trioxide (MoO 3 ) nanoflakes decorated with dysprosium oxide (Dy 2 O 3 ) nanosheets (termed Dy 2 O 3 / MoO 3 ) were synthesized via a facile probe-sonication method. With respect to pristine MoO 3 counterparts, the optimal Dy 2 O 3 / MoO 3 sensors possessed a 4.49-fold larger response at a lower temperature

show abstract

Section: Resultsmentioning

confidence: 99%

2D/2D Dy₂O₃ Nanosheet/MoO₃ Nanoflake Heterostructures for Humidity-Independent and Sensitive Ammonia Detection

Ou,

Zhou,

Guo

et al. 2023

ACS Sens.

View full text Add to dashboard Cite

show abstract

“…The widely accepted gas-sensitive response mechanism is that the adsorption/desorption process of target gas molecules and oxygen at the surface of the material can have an effect on the surface charge and depletion layers of the material, leading to a change in the material resistance. ,,, Pure MoO 3 is a typical n-type semiconductor. When in an air atmosphere, oxygen molecules are adsorbed onto the MoO 3 surface, from where they trap electrons and ionize into oxygen negative ions.…”

Section: Resultsmentioning

confidence: 99%

“…Several promising metal oxides have been investigated for NH 3 detection, including WO 3 , SnO 2 , ITO, TiO 2 , ZnO, V 2 O 5 , CuO, and MoO 3 . , Molybdenum trioxide (MoO 3 ), an important n-type semiconductor with a wide bandgap, has been widely applied in battery electrodes and photocatalysis . Due to its thermodynamic stability and high reactivity to certain reducing agents, MoO 3 has received attention in gas detection and has been studied for the detection of TMA, ethanol, H 2 S, NO 2 , NH 3 , – etc. Among them, MoO 3 has good performance for NH 3 detection.…”

Section: Introductionmentioning

confidence: 99%

Mo₂C/MoO₃@rGO Ternary Nanocomposites as High-Performance Gas Sensor for Trace NH₃ Detection at Room Temperature

Liu,

Lu,

Han

et al. 2023

ACS Appl. Electron. Mater.

View full text Add to dashboard Cite

Mo 2 C/MoO 3 @rGO ternary nanocomposites were synthesized by a hydrothermal method, which can be applied to the high-sensitivity detection of low concentration of NH 3 at room temperature. Compared with pure MoO 3 and MoO 3 @rGO sensors, the Mo 2 C/MoO 3 @rGO sensors showed a significantly improved response to NH 3 at room temperature. Among them, the 6% Mo 2 C/MoO 3 @rGO sensor showed a response of up to 0.82 for 5 ppm of NH 3 with a response time of 87 s, which was 27.33 times higher than that of pure MoO 3 (0.03 in 154 s) and 5.86 times higher than that of MoO 3 @rGO (0.14 in 139 s). It also has high repeatability, selectivity, good long-term stability, and immunity to humidity. These optimizations of the gas-sensing properties of the material may be attributed to the ability of the heterojunction to modulate the material surface carriers, the chemical sensitization and good electrocatalytic ability of Mo 2 C, and the large specific surface area and high carrier mobility of rGO. The synergistic effect between these three materials allows the designed Mo 2 C/MoO 3 @rGO ternary composite to detect trace amounts of NH 3 at room temperature, making it possible to develop high-performance NH 3 gas sensors.

show abstract

“…Apparently, this growth occurs due to an increase in the number of active centers formed during the formation of pores [ 10 , 54 ]. For example, density-functional theory (DFT) calculations for porous MoO 3 nanosheets designed to detect H 2 S show that Mo atoms at the pore edges exhibit higher adsorption activity for H 2 S and O 2 molecules [ 147 ]. Xie et al [ 148 ] and Zhang et al [ 39 ] also believe that mesopores in 2D ZnO nanoflakes contributed to the increased sensitivity of sensors based on 2D ZnO nanoflowers to ethanol.…”

Section: 3d Nanostructures Based On Porous 2d Nanosheets and Nanoflakesmentioning

confidence: 99%

Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations—Part 2: Porous 2D Nanomaterials

Tolstoy

2023

Nanomaterials

View full text Add to dashboard Cite

This article discusses the features of the synthesis and application of porous two-dimensional nanomaterials in developing conductometric gas sensors based on metal oxides. It is concluded that using porous 2D nanomaterials and 3D structures based on them is a promising approach to improving the parameters of gas sensors, such as sensitivity and the rate of response. The limitations that may arise when using 2D structures in gas sensors intended for the sensor market are considered.

show abstract

Exposed Mo atoms induced by micropores enhanced H2S sensing of MoO3 nanoflowers

Cited by 35 publications

References 70 publications

2D/2D Dy₂O₃ Nanosheet/MoO₃ Nanoflake Heterostructures for Humidity-Independent and Sensitive Ammonia Detection

2D/2D Dy₂O₃ Nanosheet/MoO₃ Nanoflake Heterostructures for Humidity-Independent and Sensitive Ammonia Detection

Mo₂C/MoO₃@rGO Ternary Nanocomposites as High-Performance Gas Sensor for Trace NH₃ Detection at Room Temperature

Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations—Part 2: Porous 2D Nanomaterials

Contact Info

Product

Resources

About

Exposed Mo atoms induced by micropores enhanced H2S sensing of MoO3 nanoflowers

Cited by 35 publications

References 70 publications

2D/2D Dy2O3 Nanosheet/MoO3 Nanoflake Heterostructures for Humidity-Independent and Sensitive Ammonia Detection

2D/2D Dy2O3 Nanosheet/MoO3 Nanoflake Heterostructures for Humidity-Independent and Sensitive Ammonia Detection

Mo2C/MoO3@rGO Ternary Nanocomposites as High-Performance Gas Sensor for Trace NH3 Detection at Room Temperature

Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations—Part 2: Porous 2D Nanomaterials

Contact Info

Product

Resources

About

2D/2D Dy₂O₃ Nanosheet/MoO₃ Nanoflake Heterostructures for Humidity-Independent and Sensitive Ammonia Detection

2D/2D Dy₂O₃ Nanosheet/MoO₃ Nanoflake Heterostructures for Humidity-Independent and Sensitive Ammonia Detection

Mo₂C/MoO₃@rGO Ternary Nanocomposites as High-Performance Gas Sensor for Trace NH₃ Detection at Room Temperature