In situ laser-assisted synthesis and patterning of graphene foam composites as a flexible gas sensing platform.
In situ laser-assisted synthesis and patterning of graphene foam composites as a flexible gas sensing platform.
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DOI：
10.1016/j.cej.2022.140956
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发表时间：
2022-12
影响因子：
15.1
通讯作者：
Jiang Zhao;Ning Yi;Xiaohong Ding;Shangbin Liu;Jia Zhu;Alexander C. Castonguay;Yuyan Gao;
中科院分区：
文献类型：
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作者：
Jiang Zhao;Ning Yi;Xiaohong Ding;Shangbin Liu;Jia Zhu;Alexander C. Castonguay;Yuyan Gao;
气敏半导体纳米材料（例如，金属氧化物、氧化石墨烯和过渡金属二硫属化物）和它们的异质结在化学电阻气体传感器中具有很大的前景。然而，它们通常需要单独的合成方法（例如，水热法、溶胶-凝胶法和共沉淀法）以及它们通过浇铸在叉指电极（IDE）上的结合也与弱的界面性质有关。这项工作展示了各种传感纳米材料及其在激光诱导石墨烯（LIG）泡沫上的异质结的原位激光辅助合成和图案化，以形成LIG复合材料作为柔性和可拉伸的气体传感平台。具有分配在顶部上的纳米材料前体的多孔LIG线或图案通过激光刻划以允许相应纳米材料的原位生长。所提出的方法的多功能性通过产生不同类型的气敏材料来突出，包括过渡金属二硫属化物（例如，MoS 2）、金属氧化物（例如，CuO）、贵金属掺杂的金属氧化物（例如，Ag/ZnO）和复合金属氧化物（例如，In_2O_3/Cr_2O_3）。通过消除IDE和单独的加热器，具有自加热的LIG气体传感平台还降低了器件的复杂性。原位合成MoS 2、CuO和Ag/ZnO的LIG气敏元件对NO2、H2S和TMA的检测限分别为2.7、9.8和5.6 ppb。结合高灵敏度、良好的选择性、快速响应/恢复和可调工作温度，集成LIG气体传感器阵列可以识别环境或呼出气体中的多种气体种类。
Gas-sensitive semiconducting nanomaterials (e.g., metal oxides, graphene oxides, and transition metal dichalcogenides) and their heterojunctions hold great promise in chemiresistive gas sensors. However, they often require a separate synthesis method (e.g., hydrothermal, so-gel, and co-precipitation) and their integration on interdigitated electrodes (IDE) via casting is also associated with weak interfacial properties. This work demonstrates in situ laser-assisted synthesis and patterning of various sensing nanomaterials and their heterojunctions on laser-induced graphene (LIG) foam to form LIG composites as a flexible and stretchable gas sensing platform. The porous LIG line or pattern with nanomaterial precursors dispensed on top is scribed by laser to allow for in situ growth of corresponding nanomaterials. The versatility of the proposed method is highlighted through the creation of different types of gas-sensitive materials, including transition metal dichalcogenide (e.g., MoS2), metal oxide (e.g., CuO), noble metal-doped metal oxide (e.g., Ag/ZnO) and composite metal oxides (e.g., In2O3/Cr2O3). By eliminating the IDE and separate heaters, the LIG gas sensing platform with self-heating also decreases the device complexity. The limit of detection (LOD) of the LIG gas sensor with in situ synthesized MoS2, CuO, and Ag/ZnO to NO2, H2S, and trimethylamine (TMA) is 2.7, 9.8, and 5.6 ppb, respectively. Taken together with the high sensitivity, good selectivity, rapid response/recovery, and tunable operating temperature, the integrated LIG gas sensor array can identify multiple gas species in the environment or exhaled breath.