Gas sensing selectivity of oxygen-regulated SnO2 films with different microstructure and texture

Li, Ruiwu; Zhou, Yanwen; Sun, Maolin; Gong, Zhen; Guo, Yuanyuan; Yin, Xi-Tao; Wu, Fayu; Ding, Wei

doi:10.1016/j.jmst.2019.06.005

Cited by 34 publications

(9 citation statements)

References 27 publications

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“…Among the various crystal facets of SnO 2 , the (110) and (101) crystal facets are mainly exposed at the surface because of their low surface energy as follows:{100} > {101} > {110} . Thus, studies have been conducted to understand the reactivity of various kinds of gases to the (110) and (101) crystal facets. − …”

Section: Resultsmentioning

confidence: 99%

Catalyst-free Highly Sensitive SnO₂ Nanosheet Gas Sensors for Parts per Billion-Level Detection of Acetone

Kim

Choi

Itoh

et al. 2020

ACS Appl. Mater. Interfaces

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The development of a facile gas sensor for the ppb-level detection of acetone is required for realizing health diagnosis systems that utilize human breath. Controlling the crystal facet of a nanomaterial is an effective strategy to fabricate a high-response gas sensor without a novel metal catalyst. Herein, we successfully synthesized a SnO2 nanosheet structure, with mainly exposed (101) crystal facets, using a SnF2 aqueous solution at 90 °C. The SnO2 nanosheets obtained after various synthesis durations (2, 6, and 24 h) were investigated. The sample synthesized for 6 h (NS-6) exhibited a 10-fold higher response (R a/R g = 10.4) for 1 ppm of acetone compared to the other samples, where R a and R g are the electrical resistances under air and the target gas. Furthermore, NS-6 detected up to 200 ppb of acetone (response = 3). In this study, we attributed the high response (of low concentrations of acetone) to the (101) crystal facet, which is the main reaction surface. The (101) crystal facet allows the facile formation of a depletion layer due to the highly reactive Sn2+. Additionally, the acetone adsorption energy of the (101) crystal facet is relatively lower than that of other crystal facets. Owing to these factors, our pristine SnO2 nanosheet gas sensor exhibited significantly high sensitivity to ppb levels of acetone.

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Section: Resultsmentioning

confidence: 99%

Catalyst-free Highly Sensitive SnO₂ Nanosheet Gas Sensors for Parts per Billion-Level Detection of Acetone

Kim

Choi

Itoh

et al. 2020

ACS Appl. Mater. Interfaces

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“…Among the MOS gas sensors, ZnO and SnO 2 as n-type metal oxide semiconductors (MOSs) have attracted much attention due to their excellent electrical properties and stable chemical and thermal features [9][10][11]. Moreover, other n-type MOSs, such as Fe 2 O 3 [12], WO 3 [13], In 2 O 3 [14] and TiO 2 [15], and p-type MOS such as NiO [16], Co 3 O 4 [17], Cr 2 O 3 [18], CuO [19] and Mn 3 O 4 [20] have been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites

Zhou

Dastan

et al. 2020

Nanomaterials

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Metal oxide semiconductor (MOS) gas sensors have the advantages of high sensitivity, short response-recovery time and long-term stability. However, the shortcoming of poor discriminability of homogeneous gases limits their applications in gas sensors. It is well-known that the MOS materials have similar gas sensing responses to homogeneous gases such as CO and H2, so it is difficult for these gas sensors to distinguish the two gases. In this paper, simple sol–gel method was employed to obtain the ZnO–xNiO composites. Gas sensing performance results illustrated that the gas sensing properties of composites with x > 0.425 showed a p-type response to both CO and H2, while the gas sensing properties of composites with x < 0.425 showed an n-type response to both CO and H2. However, it was interesting that ZnO–0.425NiO showed a p-type response to CO but an discriminable response (n-type) to H2, which indicated that modulating the p-type or n-type semiconductor concentration in p-n composites could be an effective method with which to improve the discriminability of this type of gas sensor regarding CO and H2. The phenomenon of the special gas sensing behavior of ZnO–0.425NiO was explained based on the experimental observations and a range of characterization techniques, including XRD, HRTEM and XPS, in detail.

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“…21 The peak at 572 cm −1 arises due to the oxygen vacancies. 22 The absence of this characteristic peak in a simple stirred sample of AgCl− SnO 2 (Figure 3C) confirms the role of hydrothermal synthesis in the generation of oxygen vacancies. Synthetic conditions are reported to result in various types of oxygen vacancies.…”

Section: Resultsmentioning

confidence: 60%

Synergistic Effect of Oxygen Vacancy-Rich SnO₂ and AgCl in the Augmentation of Sustained Oxygen Reduction Reaction

2023

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Developing a stable and methanol-tolerant electrocatalyst for a sustained oxygen reduction reaction (ORR) is of great importance for advancing direct methanol fuel cell applications. The silver-based electrocatalysts are particularly interesting among the promising non-Pt-based electrocatalysts for ORR. Herein, we report a single-step synthesis of a composite of AgCl and SnO2 with oxygen vacancy (AgCl–SnO2(VO)), which exhibits sustained and selective catalytic activity for the ORR along with excellent durability. Hydrothermal synthesis generates oxygen vacancies within the material and facilitates a strong interaction between AgCl and SnO2(VO), which effectively augments the ORR activity and the long-term stability of the composite. The composite exhibits remarkable methanol tolerance, as evidenced by a meager shift of only 0.002 V in the half-wave potential. Furthermore, the composite demonstrates excellent durability, with no noticeable changes in onset and half-wave potential even after 2500 cycles. The cost-effectiveness, durability, and ORR selectivity of this composite hold great promise toward contributing to the advancement of clean energy technology.

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Gas sensing selectivity of oxygen-regulated SnO2 films with different microstructure and texture

Cited by 34 publications

References 27 publications

Catalyst-free Highly Sensitive SnO₂ Nanosheet Gas Sensors for Parts per Billion-Level Detection of Acetone

Catalyst-free Highly Sensitive SnO₂ Nanosheet Gas Sensors for Parts per Billion-Level Detection of Acetone

Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites

Synergistic Effect of Oxygen Vacancy-Rich SnO₂ and AgCl in the Augmentation of Sustained Oxygen Reduction Reaction

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Gas sensing selectivity of oxygen-regulated SnO2 films with different microstructure and texture

Cited by 34 publications

References 27 publications

Catalyst-free Highly Sensitive SnO2 Nanosheet Gas Sensors for Parts per Billion-Level Detection of Acetone

Catalyst-free Highly Sensitive SnO2 Nanosheet Gas Sensors for Parts per Billion-Level Detection of Acetone

Discriminable Sensing Response Behavior to Homogeneous Gases Based on n-ZnO/p-NiO Composites

Synergistic Effect of Oxygen Vacancy-Rich SnO2 and AgCl in the Augmentation of Sustained Oxygen Reduction Reaction

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Resources

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Catalyst-free Highly Sensitive SnO₂ Nanosheet Gas Sensors for Parts per Billion-Level Detection of Acetone

Catalyst-free Highly Sensitive SnO₂ Nanosheet Gas Sensors for Parts per Billion-Level Detection of Acetone

Synergistic Effect of Oxygen Vacancy-Rich SnO₂ and AgCl in the Augmentation of Sustained Oxygen Reduction Reaction