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采用水热法一步合成二维(2D)纳米片组成的SnS2/ZnS微花结构, 在空气气氛中煅烧获得不同组分的微花复合结构, 通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线能谱仪(EDS)、透射电子显微镜(TEM)和气敏特性分析仪, 研究了煅烧温度对微花结构组分和气敏性能的影响. 结果表明: 450 ℃煅烧得到的SnO2/ZnS(SZ-450)微花结构的室温NO2气敏性能优于其他煅烧温度得到的微花结构, 其室温下对体积分数为10–4 NO2的响应值可达27.55, 响应/恢复时间为53 s/79 s, 理论检测下限低至2.1×10–7 (体积分数), 并具有良好的选择性、重复性和稳定性. 分析认为SZ-450元件优异的室温气敏特性与SnO2和ZnS之间的异质结有关, 本文可为室温NO2气体传感器提供敏感材料, 推动其研发及应用进程.SnS2/ZnS microflower structures are prepared by one-step hydrothermal method. The microflower structures with different components are obtained after calcinating SnS2/ZnS in air atmosphere. The influences of calcination temperature on the components and gas-sensing properties of microflower structures are investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), transmission electron microscopey (TEM), and gas sensitive characteristic analyzer. The results show that the gas-sensing performance to NO2 at room temperature of SnO2/ZnS microflower structure (SZ-450) is better than that of microflower structure calcinated at the other temperature. The response of SZ-450-based sensor to 10–4 NO2 at room temperature can reach 27.55, the response/recovery time is 53 s/79 s, the theoretical detection limit is as low as 2.1×10–7, and it has good selectivity, repeatability, and stability. The analysis indicates that the excellent room-temperature gas-sensing characteristic of SZ-450 is related to the heterojunction between SnO2 and ZnS. This work can provide sensitive materials for room-temperature NO2 gas sensor and promote its development and application.
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Keywords:
- SnO2/ZnS /
- gas sensor /
- NO2 detection /
- room temperature
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图 1 SZ-0, SZ-300, SZ-450, SZ-550和SZ-700微花结构的XRD图谱
Fig. 1. XRD patterns of SZ-0, SZ-300, SZ-450, SZ-550 and SZ-700 microflower structures.
图 2 不同样品的SEM图 (a) SZ-0; (b) SZ-300; (c) SZ-450; (d) SZ-550; (e) SZ-700. (f) SZ-450的EDS图谱
Fig. 2. SEM image of different samples: (a) SZ-0; (b) SZ-300; (c) SZ-450; (d) SZ-550; (e) SZ-700. (f) EDS pattern of SZ-450.
图 3 (a), (b) SZ-450的TEM图像; (c), (d) SZ-450的HRTEM图像
Fig. 3. (a), (b) TEM image of SZ-450; (c), (d) HRTEM image of SZ-450.
图 4 (a) 不同传感器在室温下对体积分数为10–4气体的选择性; (b) 室温空气中的电阻
Fig. 4. (a) Gas selectivity of as-prepared samples for different sensors at 10–4 of volume fraction at room temperature; (b) resistance of different sensors in air at room temperature.
图 5 (a) 不同传感器对体积分数为5×10–7—4×10–4 NO2的动态响应曲线; (b) 对数形式下的响应-浓度关系
Fig. 5. (a) Dynamic response curves of different sensors for NO2 at 5×10–7–4×10–4 of volume fraction; (b) relationship curves of the responses-concentrations in logarithm form.
图 6 不同传感器的响应/恢复时间曲线(a)和折线(b)
Fig. 6. Response/recovery time curves (a) and line graph (b) for different sensors.
图 7 不同传感器在体积分数为10–4的NO2下的重复性(a)与长期稳定性(b)
Fig. 7. Repeatability curves (a) and long-term stability curves (b) of different sensors for NO2 at 10–4 of volume fraction.
图 8 SZ-450传感器在不同气体中的传感机制示意图 (a)空气; (b) NO2
Fig. 8. Schematic diagram of SZ-450 sensor in different gases: (a) Air; (b) NO2.
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[1] 储宇星, 刘海瑞, 闫爽 2021 无机材料学报 36 950
Google Scholar
Chu X Y, Liu H R, Yan S 2021 J. Inorg. Mater. 36 950
Google Scholar
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Google Scholar
Xu X M, Li B R, Yang B C, Jiang L, Yin L Z, Ding Y P, Cao C 2013 Acta Phys. Sin. 62 200704
Google Scholar
[3] Yang Z, Su C, Wang S T, Han Y T, Chen X W, Xu S, Zhou Z H, Hu N T, Su Y J, Zeng M 2020 Nanotechnology 31 075501
Google Scholar
[4] Das S, Jayaraman V 2014 Prog. Mater. 66 112
Google Scholar
[5] Zhang J, Wang S R, Wang Y M, et al. 2009 Sens. Actuators B Chem. 135 610
Google Scholar
[6] Li J, Yang M, Cheng X L, et al. 2021 J. Hazard. Mater. 419 126414
Google Scholar
[7] Shah V, Bhaliya J, Patel G, Joshi P 2022 J. Inorg. Organomet. P. 32 741
Google Scholar
[8] Kumar S, Pavelyev V, Mishra P, Tripathi N, Sharma P, Calle F 2020 Mat. Sci. Semicon. Proc. 107 104865
Google Scholar
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Google Scholar
[10] Mutlu Z, Wu R J, Wickramaratne D, et al. 2016 Small 12 2935
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[13] Wang X, Xie Z, Huang H, Liu Z, Chen D, Shen G 2012 J. Mater. Chem. A 22 6845
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[15] Wahab R, Ansari S G, Kim Y S, Dhage M S, Seo H K, Shin S H S 2009 Met. Mater. Int. 15 453
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[16] Houšková V, Štengl V, Bakardjieva S, Murafa N, Kalendová A 2007 J. Phys. Chem. A 111 4215
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[19] Park S, An S, Mun Y, Lee C 2014 Curr. Appl. Phys. 14 S57
Google Scholar
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Google Scholar
[21] Park S H, An S Y, Ko H S, Lee S M, Lee C M 2013 Sens. Actuators B Chem. 188 1270
Google Scholar
[22] Chen X W, Wang T, Han Y T, Lv W, Li B L, Su C, Zeng M, Yang J H, Hu N T, Su Y J, Yang Z 2021 Sens. Actuators B Chem. 345 130423
Google Scholar
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Google Scholar
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Google Scholar
[25] Liu C, Chen X W, Luo H Y, Li B L, Shi J, Fan C, Yang J H, Zeng M, Zhou Z H, Hu N T, Su Y J, Yang Z 2021 Sens. Actuators B Chem. 347 130608
Google Scholar
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Google Scholar
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Google Scholar
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Google Scholar
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[31] Zhu Q Q, Gu D, Liu Z, Huang B Y, Li X G 2021 Sens. Actuators B Chem. 349 130775
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Google Scholar
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