High performance formaldehyde detection based on a novel copper (II) complex functionalized QCM gas sensor
High performance formaldehyde detection based on a novel copper (II) complex functionalized QCM gas sensor
复制标题
基于新型铜(II)络合物功能化QCM气体传感器的高性能甲醛检测
DOI：
10.1016/j.snb.2016.12.015
复制
发表时间：
2017-09-01
影响因子：
8.4
通讯作者：
Xu, Jiaqiang
中科院分区：
文献类型：
--
作者：
Wang, Luyu;Wang, Zhaoxi;Xu, Jiaqiang
为了构建高灵敏度和稳定性的QCM气体传感器，我们提出了一种创新的策略。首先，我们采用物理气相沉积（PVD）方法在QCM银电极表面镀上一层薄薄的铜。然后，在铜层上原位生长了一种新型的金属配合物[Cu（DDS）（2）（Cl）（2）（MeOH）（2）]作为传感材料，以保证金属配合物传感材料与QCM电极之间的强耦合。通过元素分析、单晶XRD、SEM、PXRD、红外光谱和热重分析对材料进行了表征。传感实验结果表明，由于氨基与甲醛分子之间的可逆相互作用，QCM传感器对气态甲醛具有高的灵敏度和选择性。检测限可达50 ppb。这表明该传感器在快速、稳定、灵敏、选择性的甲醛现场检测领域具有很大的潜力。基于变温微重实验，定量得到了络合物与甲醛分子间的焓变，表明络合物与甲醛分子间的相互作用属于化学吸附。用Gaussian 09计算Δ H值表明，-NH_2基团与醛基之间的化学吸附在选择性检测甲醛气体中起主导作用。(C)2016爱思唯尔B. V.保留所有权利。
In order to construct highly sensitive and stable QCM gas sensor, we present an innovative strategy. Firstly, we employ a physical vapor deposition (PVD) method to coat a thin layer of copper on the surface of QCM silver electrode. Then, a novel metal complex as sensing material, [Cu(DDS)(2)(Cl)(2)(MeOH)(2)] is grown in-situ on the copper layer to ensure a strong coupling between metal complex sensing materials and QCM electrode. The sensing material is characterized through following instruments: elemental analysis, single crystal XRD, SEM, PXRD, IR spectra and TGA. The sensing test results indicate that the QCM sensor exhibit high sensitivity and selectivity toward gaseous formaldehyde because of a reversible interaction between amino group and HCHO molecule. The detection limit reaches down to 50 ppb. This implies the facile-fabricated sensor has a great potential in the area of rapid, stable, sensitive, and selective formaldehyde on-site detection. Based on the temperature-varying micro-gravimetric experiment, enthalpy change is quantitatively obtained, which indicates that the interaction between the complex and HCHO molecules belongs to chemical adsorption. The values of Delta H calculated by Gaussian 09 indicate that chemical adsorption between -NH2 group and aldehyde group play a leading role in detecting selectively formaldehyde gas. (C) 2016 Elsevier B.V. All rights reserved.