MoS2-doped spherical SnO2 for SO2 sensing under UV light at room temperature

He, Xingxin; Ying, Zhihua; Wen, Fei; Li, Lili; Zheng, Xiaolong; Zheng, Peng; Wang, Gaofeng

doi:10.1016/j.mssp.2021.105997

Cited by 25 publications

(9 citation statements)

References 49 publications

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“…In order to study the changes in the chemical state of elements before and after combination, MoS 2 -HMS was also characterized by XPS (Figure S3). Compared with MoS 2 -HMS, the peak positions of Mo element in the MoS 2 -HMS/SnO 2 heterostructure move toward the lower energy direction obviously, which means that the electron cloud density near MoS 2 increased after combination. ,, Similarly, the 2p peak of the S element also has a similar movement trend. The movement of energy to the lower energy direction indicates that electrons flow from SnO 2 to MoS 2 through the heterogeneous interface.…”

Section: Resultsmentioning

confidence: 86%

“…When analyzing the Mo element, it is found that the two peaks at 228.3 and 231.5 eV correspond to the characteristic peaks of Mo 3d 5/2 and Mo 3d 3/2 , respectively (Figure 2a), indicating the existence of Mo 4+ in MoS 2 . 20,45 The highresolution XPS spectrum of S 2p shows two characteristic peaks at 161.2 and 162.37 eV, corresponding to 2p 3/2 and 2p 1/2 peaks of S, respectively (Figure 2b). Figure 2c shows two characteristic peaks of Sn 3d which are located at 486.38 and 494.8 eV, respectively, and the energy difference of about 8.4 eV is exactly in line with the energy difference between the two peaks of Sn 4+ in rutile-phase SnO 2 .…”

Section: Resultsmentioning

confidence: 99%

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Boosted Light-Excited NO₂ Detection Based on Hierarchical Z-Scheme MoS₂/SnO₂ Heterostructure Microspheres at Room Temperature

et al. 2023

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Light excitation has been developed as an economical way to realize room-temperature gas sensing recently. However, the high recombination rate of photogenerated carriers in semiconductor gas sensing materials leads to very limited carriers that can effectively take part in sensing reactions, which greatly restricts the further performance improvement of gas sensing under light excitation. Here, a hierarchical Z-scheme heterostructure microsphere of MoS 2 /SnO 2 is designed and prepared. The heterostructure demonstrates an outstanding NO 2 sensing performance at room temperature with the excitation of a low-power LED light (0.06 W), which exhibits an ultrahigh sensitivity of 264.2 to 10 ppm of NO 2 along with acceptable response/recovery properties. The physical mechanism of NO 2 sensing is analyzed. The results suggest that the construction of the Z-scheme heterostructure between MoS 2 and SnO 2 can greatly promote the separation of photogenerated carriers so that more photogenerated carriers can take part in the NO 2 sensing reaction. Furthermore, the designing of a hierarchically porous structure can provide abundant active sites for gas sensing reactions. The work not only expands the development of Z-scheme heterostructures in gas sensing but also provides a strategy to promote the performance of lightexcited gas sensors by designing a Z-scheme heterostructure with a hierarchically porous structure.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Boosted Light-Excited NO₂ Detection Based on Hierarchical Z-Scheme MoS₂/SnO₂ Heterostructure Microspheres at Room Temperature

et al. 2023

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“…However, these methods are unfavorable due to complex operation, high costs, and large dimensions, which compromise their effectiveness in detecting SO2 [3]. Recently metal oxide semiconductor gain lot attention as SO2 gas sensing candidate due to its simplicity, cost-effectiveness, and controllability [8]- [10]. Among others metal oxide materials exploited for SO2 sensing, tin oxide (SnO2) has emerged as a noteworthy candidate [11].…”

Section: Introductionmentioning

confidence: 99%

A Novel Palm Sugar-Mediated Hydrothermal Synthesis of Spherical Tin Oxide for Enhanced SO₂ Gas Detection

Nursyahid,

Septiani,

Hermawan

2024

J. Phys.: Conf. Ser.

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Sulfur dioxide (SO2), a hazardous gas resulting from combustion and natural reactions, poses environmental and health risks. This study presents a novel approach to synthesize tin oxide (SnO2) using palm sugar-mediated hydrothermal methods for enhanced SO2 gas sensing. The simplicity and cost-effectiveness of the method are highlighted, addressing challenges posed by complex and resource-intensive conventional methods. Spherical SnO2 particles were successfully synthesized and characterized using SEM and XRD techniques. From the SEM image, it was known that SnO2 has spherical morphologies and is expected to agglomerate after being calcined. XRD analysis shows that SnO2 has a rutile tetragonal phase structure. The synthesized SnO2 demonstrated favorable gas sensing properties when exposed to SO2, exhibiting elevated response at increased temperatures and a linear relationship between response and gas concentration. The results indicate the potential of this method for effective and efficient SO2 detection.

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“…Two-dimensional (2D) transition metal dichalcogenide (TMD) semiconductors have been extensively studied in the field of sensing technology due to their intrinsic 2D nature and decent material properties. − However, the absorption of most gases on the surface of bare TMDs is relatively weak, leading to limited responsivity. − Til now, various types of gas sensors based on metal-doped TMDs or TMD/metal oxide heterojunctions have been developed to improve gas absorption as well as sensing capability. − Such techniques can reduce the energy required for TMD to react with gas molecules and increase the number of adsorption sites with enhanced diffusion to improve the gas sensing performance. In recent years, metal–organic frameworks (MOFs) have attracted great attention due to their capability to bind gas molecules through ordered binding sites with feasible material manipulation .…”

Section: Introductionmentioning

confidence: 99%

Gate-Modulated High-Response Field-Effect Transistor-Type Gas Sensor Based on the MoS₂/Metal–Organic Framework Heterostructure

Wang

Tan

et al. 2022

ACS Appl. Mater. Interfaces

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The high surface-to-volume ratio and decent material properties of two-dimensional (2D) transition metal dichalcogenides (TMDs) make them advantageous as an active channel in field-effect transistor (FET)-type gas sensing devices. However, most existing TMD gas sensors are based on a two-terminal resistance-type structure and suffer from low responsivity and slow response, which has urged materials optimization as well as device engineering. Metal–organic frameworks (MOFs) have a large number of ordered binding sites in the pores that can specifically bind to gas molecules and can be decorated on TMD surfaces to enhance gas sensing capabilities. In this work, we successfully realize the FET-type gas sensor with MoS2-MOF as the channel. The fabricated gas sensor exhibits enhanced NH3 sensing performance (22.475 times higher in responsivity) as compared to the device with a bare MoS2 channel. In addition, the FET-type gas sensor geometry enables effective tuning of sensitivity through electrical gating based on the modulation over the channel carrier concentration. Furthermore, the dependence of responsivity on the MoS2 thickness is investigated as well to achieve an in-depth understanding of the electrical modulation mechanism of the MOF-decorated MoS2 gas sensors. The demonstrated results can pave an attractive pathway toward the realization of advanced high-response and tunable TMD-based gas sensing devices.

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MoS2-doped spherical SnO2 for SO2 sensing under UV light at room temperature

Cited by 25 publications

References 49 publications

Boosted Light-Excited NO₂ Detection Based on Hierarchical Z-Scheme MoS₂/SnO₂ Heterostructure Microspheres at Room Temperature

Boosted Light-Excited NO₂ Detection Based on Hierarchical Z-Scheme MoS₂/SnO₂ Heterostructure Microspheres at Room Temperature

A Novel Palm Sugar-Mediated Hydrothermal Synthesis of Spherical Tin Oxide for Enhanced SO₂ Gas Detection

Gate-Modulated High-Response Field-Effect Transistor-Type Gas Sensor Based on the MoS₂/Metal–Organic Framework Heterostructure

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MoS2-doped spherical SnO2 for SO2 sensing under UV light at room temperature

Cited by 25 publications

References 49 publications

Boosted Light-Excited NO2 Detection Based on Hierarchical Z-Scheme MoS2/SnO2 Heterostructure Microspheres at Room Temperature

Boosted Light-Excited NO2 Detection Based on Hierarchical Z-Scheme MoS2/SnO2 Heterostructure Microspheres at Room Temperature

A Novel Palm Sugar-Mediated Hydrothermal Synthesis of Spherical Tin Oxide for Enhanced SO2 Gas Detection

Gate-Modulated High-Response Field-Effect Transistor-Type Gas Sensor Based on the MoS2/Metal–Organic Framework Heterostructure

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Product

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Boosted Light-Excited NO₂ Detection Based on Hierarchical Z-Scheme MoS₂/SnO₂ Heterostructure Microspheres at Room Temperature

Boosted Light-Excited NO₂ Detection Based on Hierarchical Z-Scheme MoS₂/SnO₂ Heterostructure Microspheres at Room Temperature

A Novel Palm Sugar-Mediated Hydrothermal Synthesis of Spherical Tin Oxide for Enhanced SO₂ Gas Detection

Gate-Modulated High-Response Field-Effect Transistor-Type Gas Sensor Based on the MoS₂/Metal–Organic Framework Heterostructure