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首页> 外文期刊>RSC Advances >The effect of rigid phenoxyl substituent on the NH3-sensing properties of tetra-α-(4-tert-butylphenoxyl)-metallophthalocyanine/reduced graphene oxide hybrids
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The effect of rigid phenoxyl substituent on the NH3-sensing properties of tetra-α-(4-tert-butylphenoxyl)-metallophthalocyanine/reduced graphene oxide hybrids

机译：刚性苯氧基取代基对四-α-（4- <叔>叔丁基-苯氧基）-金属酞菁/还原氧化石墨烯杂化物的NH 3 传感特性的影响

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Herein, we report a type of enhanced ammonia (NH3) sensing materials formed by the functionalization of reduced graphene oxide (RGO) with 1,8,15,22-tetra-(4-tert-butylphenoxyl)-metallophthalocyanine (TBPOMPc, M = Cu, Ni, and Pb) via a solution self-assembly method based on π–π stacking interactions. The RGO/TBPOMPc hybrids exhibit excellent sensitivity, high response value, and fast response and recovery at room temperature, especially the RGO/TBPOPbPc sensor. The enhancement of the NH3-sensing performance by TBPOMPc with a rigid phenoxyl-substituted group is attributed to the self-assembly behavior of TBPOMPc molecules. The rigid structure of TBPOMPc effectively prevents the intermolecular aggregation behavior. On the one hand, it expands the specific surface area of the RGO/TBPOMPc hybrids, which is propitious for the physical adsorption and diffusion of NH3 molecules and reduces the response and recovery time. On the other hand, it weakens the electronic interaction between TBPOMPc molecules and results in reducing the resistance of charge transfer from NH3 to TBPOMPc. Moreover, TBPOMPc is beneficial to enhance the sensitivity and selectivity of the RGO/TBPOMPc sensors towards NH3. By contrast, the response of various RGO/TBPOMPc sensors decreases in the order of RGO/TBPOPbPc > RGO/TBPOCuPc > RGO/TBPONiPc. Furthermore, the rigid structure and central metals of TBPOMPc play a critical role in the sensitivity of NH3, as evidenced from the scanning tunneling microscopy, current–voltage characteristics, and electrochemical impedance spectra.
机译：本文中，我们报告了一种通过还原氧化石墨烯（RGO）的1,8,15,22-tetra官能化作用形成的增强型氨（NH 3 ）传感材料。 -（4- 叔-丁基苯氧基）-金属酞菁（TBPOMPc，M = Cu，Ni和Pb）通过基于π-π堆积相互作用的溶液自组装方法。 RGO / TBPOMPc杂化物表现出出色的灵敏度，高响应值以及在室温下的快速响应和恢复，尤其是RGO / TBPOPbPc传感器。具有刚性苯氧基取代基的TBPOMPc对NH 3 传感性能的增强归因于TBPOMPc分子的自组装行为。 TBPOMPc的刚性结构可有效防止分子间聚集行为。一方面，它扩大了RGO / TBPOMPc杂种的比表面积，有利于NH 3 分子的物理吸附和扩散，并降低了响应和恢复时间。另一方面，它减弱了TBPOMPc分子之间的电子相互作用，并导致电荷从NH 3 到TBPOMPc的转移阻力降低。此外，TBPOMPc有利于增强RGO / TBPOMPc传感器对NH 3 的灵敏度和选择性。相反，各种RGO / TBPOMPc传感器的响应按RGO / TBPOPbPc> RGO / TBPOCuPc> RGO / TBPONiPc的顺序降低。此外，TBPOMPc的刚性结构和中心金属在NH 3 的灵敏度中起着至关重要的作用，如扫描隧道显微镜，电流-电压特性和电化学反应所证明的那样阻抗谱。

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