ZnO@ZIF-8 Core-Shell Structure Gas Sensors with Excellent Selectivity to H(2).
ZnO@ZIF-8 Core-Shell Structure Gas Sensors with Excellent Selectivity to H(2).
复制标题
ZnO@ZIF-8核壳结构气体传感器，对H-2具有优异的选择性
DOI：
10.3390/s21124069
复制
发表时间：
2021-06-12
期刊：
影响因子：
--
通讯作者：
Zhang S
中科院分区：
文献类型：
--
作者：
Lv R;Zhang Q;Wang W;Lin Y;Zhang S
随着能源危机的加剧，氢气作为一种清洁能源在工业生产和人们的日常生活中得到越来越广泛的应用。然而，由于氢气的易燃易爆特性，其在储存和运输中存在着安全隐患。气体检测是解决这一问题的关键。具有更多实用和商业价值的高质量传感器必须能够准确地检测环境中的目标气体。新型多孔金属有机骨架材料由于具有较高的比表面积和配位的孔结构，可以有效地提高传感器的选择性。通过对金属氧化物进行表面修饰来提高金属氧化物传感器对氢气的选择性和灵敏度已经得到了广泛的研究。然而，MOF修饰膜厚度对氢敏传感器选择性的影响研究较少。此外，MOF修饰膜提高传感器选择性的机理尚不清楚。本文采用均匀沉淀法制备了纳米氧化锌颗粒。采用丝网印刷技术制备了纳米氧化锌(NP)气敏元件。然后用水热合成法在气敏元件表面生长了致密的ZIF-8薄膜。用X射线衍射仪、透射电子显微镜、扫描电子显微镜、能谱仪、布鲁诺-埃米特-泰勒能谱仪和差示扫描量热仪对产物的形貌、元素组成和性能进行了分析。结果表明，生长4h的ZIF-8薄膜不能形成致密的核壳结构。通过对150~290℃温度范围内氢气(1000ppm)、乙醇(100ppm)和丙酮(50ppm)的检测和分析，发现ZIF-8传感器对氢气的响应显著提高，对乙醇和丙酮的响应降低。通过比较响应系数的变化，当ZIF-8的厚度为130 nm时，气敏元件在230℃时对氢的选择性有明显的提高，随着厚度的不断增加，选择性趋于抑制。讨论了不同厚度的ZIF-8膜提高传感器选择性的机理。
As the energy crisis becomes worse, hydrogen as a clean energy source is more and more widely used in industrial production and people’s daily life. However, there are hidden dangers in hydrogen storage and transportation, because of its flammable and explosive features. Gas detection is the key to solving this problem. High quality sensors with more practical and commercial value must be able to accurately detect target gases in the environment. Emerging porous metal-organic framework (MOF) materials can effectively improve the selectivity of sensors as a result of high surface area and coordinated pore structure. The application of MOFs for surface modification to improve the selectivity and sensitivity of metal oxides sensors to hydrogen has been widely investigated. However, the influence of MOF modified film thickness on the selectivity of hydrogen sensors is seldom studied. Moreover, the mechanism of the selectivity improvement of the sensors with MOF modified film is still unclear. In this paper, we prepared nano-sized ZnO particles by a homogeneous precipitation method. ZnO nanoparticle (NP) gas sensors were prepared by screen printing technology. Then a dense ZIF-8 film was grown on the surface of the gas sensor by hydrothermal synthesis. The morphology, the composition of the elements and the characters of the product were analyzed by X-ray diffraction analysis (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), Brunauer-Emmett-Teller (BET) and differential scanning calorimetry (DSC). It is found that the ZIF-8 film grown for 4 h cannot form a dense core-shell structure. The thickness of ZIF-8 reaches 130 nm at 20 h. Through the detection and analysis of hydrogen (1000 ppm), ethanol (100 ppm) and acetone (50 ppm) from 150 °C to 290 °C, it is found that the response of the ZnO@ZIF-8 sensors to hydrogen has been significantly improved, while the response to ethanol and acetone was decreased. By comparing the change of the response coefficient, when the thickness of ZIF-8 is 130 nm, the gas sensor has a significantly improved selectivity to hydrogen at 230 °C. The continuous increase of the thickness tends to inhibit selectivity. The mechanism of selectivity improvement of the sensors with different thickness of the ZIF-8 films is discussed.
登录
查看更多内容
影响因子：
3.9
作者：
Meng, Xin;Zhang, Qinyi;He, Ze
通讯作者：
He, Ze
影响因子：
4.4
作者：
FIRTH, JG;JONES, A;JONES, TA
通讯作者：
JONES, TA
影响因子：
15.6
作者：
Ahmad, Rafiq;Majhi, Sanjit Manohar;Salama, Khaled N.
通讯作者：
Salama, Khaled N.
影响因子：
3.9
作者：
Hara, N;Macdonald, DD
通讯作者：
Macdonald, DD
基于UIO-66金属有机框架作为预浓缩器的高效丙酮蒸气催化发光气体传感器
影响因子：
8.4
作者：
Huang, Xiaoying;Huang, Zili;Lv, Yi
通讯作者：
Lv, Yi