Muzikante Inta, Parra Vicente, Dobulans Rorijs, Fonavs Egils, Latvels Janis, Bouvet Marcel
Laboratory of Organic Materials, Institute of Solid State Physics. University of Latvia, Riga (Latvia).
Ecole Supérieure de Physique et Chimie Industrielles (ESPCI) and Laboratoire de Chimie Inorganique et Matériaux Moléculaires-CNRS UMR 7071. Université Pierre et Marie Curie-Paris 6, Paris (France).
Sensors (Basel). 2007 Nov 26;7(11):2984-2996. doi: 10.3390/s7112984.
Experimental data concerning the changes in the current-voltage (I-V) perfor-mances of a molecular material-based heterojunction consisting of hexadecafluorinatednickel phthalocyanine (Ni(FPc)) and nickel phthalocyanine (NiPc),(Au|Ni(FPc)|NiPc|Al) are introduced as an unprecedented principle of transduction for gassensing performances. The respective n- and p-type doped-insulator behaviors of therespective materials are supported, owing to the observed changes in surface potential(using the Kelvin probe method) after submission to electron donor (ammonia) and electronacceptor gases (ozone). On the other hand, the bilayer device exhibits strong variations inthe built-in potential of the junction and in its rectification ratio. Moreover, large increasesoccur in forward and reverse currents in presence of ammonia vapors. These make possiblea multimodal principle of detection controlled by a combined effect between theheterojunction and the NiPc|Al contact. Indeed, this metal/organic junction plays a criticalrole regarding the steady asymmetry of the I-V profiles during the device's doping evenusing high ammonia concentrations. This approach offers a more sophisticated alternative tothe classically studied, but at times rather operation-limited, resistive gas sensors.
介绍了关于由十六氟代镍酞菁（Ni(FPc)）和镍酞菁（NiPc）组成的分子材料基异质结（Au|Ni(FPc)|NiPc|Al）的电流-电压（I-V）性能变化的实验数据，这是一种前所未有的气体传感性能转导原理。由于在暴露于电子供体（氨）和电子受体气体（臭氧）后观察到表面电势的变化（使用开尔文探针法），支持了各材料相应的n型和p型掺杂绝缘体行为。另一方面，双层器件在结的内建电势及其整流比方面表现出强烈变化。此外，在氨蒸气存在下，正向和反向电流大幅增加。这些使得由异质结和NiPc|Al接触之间的联合效应控制的多模态检测原理成为可能。实际上，即使使用高浓度氨，这种金属/有机结在器件掺杂期间对I-V曲线的稳定不对称性也起着关键作用。这种方法为经典研究但有时操作受限的电阻式气体传感器提供了一种更复杂的替代方案。
