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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Localized Surface Plasmon Resonance Based Tapered Fiber Optic Ethanol Sensor
摘要： Ethanol is mostly found in drinks, food, beverages and in the human body fluids, e.g. urine, serum, sweat, saliva, and blood etc. A high concentration of ethanol in body fluids causes various metabolic disorders like diabetes, cirrhosis and hepatitis. Therefore, the detection of ethanol is essential for clinical and forensic investigation. In this study, we report the fabrication and characterization of a localized surface plasmon resonance (LSPR) based tapered fiber optic ethanol sensor. Nowadays LSPR is a very useful technique for biosensing applications. For the LSPR phenomenon, the size of the nanoparticles should be smaller than the wavelength of the light. When an electromagnetic wave is incident on metal nanoparticles, the collective oscillation of the free electrons inside the metal nanoparticles occurs. The maximum amplitude occurs when the frequency of oscillation matches with the frequency of the incident light. Due to the frequency matching a strong field enhancement is observed around the nanoparticles. In the phenomenon called as LSPR, the peak absorbance wavelength depends on the dielectric constant of the medium surrounding the nanoparticles. To fabricate the LSPR based fiber optic probe for ethanol sensing, we have synthesized gold nanoparticles (AuNP) using Turkevich method. The TEM image of AuNPs is shown in fig. 1 (a). The schematic of the LSPR probe is shown in fig 1 (b). The probe is consists of AuNPs over the core of the tapered optical fiber followed by the immobilized layer of enzyme alcohol dehydrogenase (ADH) and coenzyme nicotinamide adenine dinucleotide (NAD). For the attachment of gold nanoparticles the core was cleaned by pirhana solution and kept in amino silane solution. Dip coating was used to coat the AuNPs over the silanized core. After this, the probe was incubated in 1 mM aqueous solution of cystamine dihydrochloride for 1 h for attachment of –NH2 groups over the AuNPs-coated fiber core. Finally, the probe was incubated for 12 h into the ADH and NAD solution. This completed the probe fabrication step.
关键词： Ethanol Sensor,Alcohol Dehydrogenase,Tapered Fiber Optic,Localized Surface Plasmon Resonance,Nicotinamide Adenine Dinucleotide,Gold Nanoparticles
更新于2025-09-11 14:15:04
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Synthesis of Sn-doped ZnO hierarchical particles and their gas-sensing properties
摘要： In this work, un-doped and Sn-doped hierarchical ZnO particles with high dispersity were successfully fabricated by a facile liquid reaction. The prepared samples are characterised by X-ray diffraction and scanning electron microscopy. The as-synthesised hierarchical ZnO particles with a diameter of ～1.5 μm were obtained by considerably intersecting thin nanosheets of ～20 nm thickness. The morphology of ZnO structures can be varied by adjusting reaction parameters, e.g. reaction temperature, calcination temperature, and dopant concentration. On the basis of experimental results, the gas-sensing measurement displays that the sensor based on Sn-doped ZnO microstructures have a low detection of 10 ppm ethanol at an operational temperature of 250°C, demonstrating its outstanding gas-sensing performance. Therefore, the ?ower-like Sn-doped ZnO have prospective applications in a multifunction ethanol sensor. Moreover, the fabrication method reported in the work is facile, ?exible and operable, it is possible to extend to synthesise other types of metal oxide-based applications in various ?elds.
关键词： Sn-doped ZnO,hierarchical particles,facile liquid reaction,gas-sensing properties,ethanol sensor
更新于2025-09-10 09:29:36