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A photonic crystal fibre (PCF) surface enhanced Raman scattering (SERS) sensor is developed based on silver nanoparticle colloid. Analyte solution and silver nanoparticles are injected into the air holes of PCF by a simple modified syringe to overcome mass-transport constraints, allowing more silver nanoparticles involved in SERS activity. This sensor offers significant benefit over the conventional SERS sensor with high flexibility, easy manufacture. We demonstrate the detection of 4-mercaptobenzoic acid (4-MBA ) molecules with the injecting way and the common dipping measurement. The injecting way shows obviously better results than the dipping one. Theoretical analysis indicates that this PCF SERS substrate offers enhancement of about 7 orders of magnitude in SERS active area. 相似文献
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以类双酚单体4-(3-氯-4-羟基-苯基)-2H-二氮杂萘-1-酮(DHPZ-OC)和对氯苯腈为原料进行亲核取代反应合成二腈化合物4-[3-氯-4-(4-氰基苯氧基)苯基]-2-(4-氰基苯基)二氮杂萘-1-酮(),然后在碱性(KOH)条件下进行水解制得了一种新型的含氯取代杂萘联苯结构的芳香二酸,4-[3-氯-4-(4-羧基苯氧基)苯基]-2-(4-羧基苯基)二氮杂萘-1-酮().用新二酸与各种芳香二胺进行直接缩合聚合制得了一系列新型氯取代含杂萘联苯结构的聚芳酰胺,特性粘度可达1.23dL/g.用FTIR和1HNMR研究了新型二酸单体及聚合物的结构.该类聚芳酰胺均可溶解于NMP,DMAc和DMSO等极性有机溶剂中,并且可浇铸成透明韧性膜,其玻璃化转变温度在291~332℃之间,10%的热失重温度在460℃以上. 相似文献
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In this article, we reported near-field research on azobenzene polymer liquid crystal films using scanning near-field optical microscopy (SNOM). Optical writing and subsequently topographic reading of the patterns with subwavelength resolution were carried out in our experiments. Nanometer scale dots and lines were successfully fabricated on the films and the smallest dot diameter is about 120 nm. The width of the line fabricated is about 250 nm. This method is also a choice for nanolithography. The mechanism of the surface deformation on the polymer films was briefly analyzed from the viewpoint of gradient force in the optical near field. The intensity distribution of the electric field near the tip aperture was numerically simulated using finite-difference time-domain (FDTD) method and the numerical simulation results were consistent with the experimental results. 相似文献
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Optical-quality films of a few μm thickness are a basic re- quirement for integrated optics[1-3]. Since such films are thick by normal coating standards, a number of special- ized methods have been developed to form them. The sol-gel processing is one approach because of the high optical quality of materials produced and freedom to im- pregnate them with a variety of additives to modify their optical characteristics. It is a popular and widespread technique for preparing coating films in labo… 相似文献
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