Physics Department, Indian Institute of Technology Delhi, New Delhi, 110016, India.
Phys Chem Chem Phys. 2013 Jul 28;15(28):11868-74. doi: 10.1039/c3cp51525g. Epub 2013 Jun 13.
We report an experimental study on a surface plasmon resonance (SPR)-based fiber optic hydrogen sulphide gas sensor with a thin metal oxide (zinc oxide (ZnO)) layer as the additional layer. This zinc oxide layer is grown over the copper layer to support surface plasmons at the metal-dielectric interface at room temperature. The wavelength interrogation mode of operation has been used to characterize the sensor. The thin film of zinc oxide over the copper film was deposited on the unclad portion of the fiber by the thermal evaporation technique. Experiments were performed for the detection of concentrations of hydrogen sulphide gas varying from 0 to 100 ppm around the probe. The unpolarized light from a polychromatic source is launched from one end of the fiber and the corresponding SPR spectrum is recorded at the other end. The recorded SPR spectrum shows a shift in the resonance wavelength on a change in the hydrogen sulphide gas concentration, which is considered as a detectable signal for the characterization of the sensor. Further, the optimization of the performance of the sensor was achieved by varying the thickness of the zinc oxide film. The sensor possesses a very fast response time and high sensitivity. Since the sensor utilizes optical fibers it has additional advantages of remote sensing, online monitoring, light weight and low cost.
我们报告了一项基于表面等离子体共振（SPR）的光纤硫化氢气体传感器的实验研究，该传感器具有作为附加层的薄金属氧化物（氧化锌（ZnO））层。该氧化锌层在铜层上生长，以在室温下支持金属-电介质界面处的表面等离子体。已经使用波长询问模式来表征传感器。通过热蒸发技术将铜膜上的氧化锌薄膜沉积在光纤的未覆盖部分上。实验是在探头周围检测浓度从 0 到 100 ppm 的硫化氢气体进行的。来自多色光源的非偏振光从光纤的一端发射，并在另一端记录相应的 SPR 光谱。记录的 SPR 光谱显示在硫化氢气体浓度变化时共振波长发生位移，这被认为是传感器特性的可检测信号。此外，通过改变氧化锌膜的厚度优化了传感器的性能。该传感器具有非常快的响应时间和高灵敏度。由于传感器利用光纤，因此具有远程感测、在线监测、重量轻和低成本等额外优势。
