Gas Sensor Based on Surface Enhanced Raman Scattering

Abstract

In order to address problems of safety and identification in gas detection, an optical detection method based on surface enhanced Raman scattering (SERS) was studied to detect ethanol vapor. A SERS device of silver nanoparticles modified polyvinylpyrrolidone (PVP) was realized by freeze-drying method. This SERS device was placed in a micro transparent cavity in order to inject ethanol vapor of 4% and obtain Raman signals by confocal Raman spectrometer. We compared different types of SERS devices and found that the modification of polyvinylpyrrolidone improves adsorption of ethanol molecules on surfaces of silver nanoparticle, and finally we provide the mechanism by theory and experiment. Finite Difference Time Domain(FDTD) simulation shows that single layer close-packed Ag nanoparticles have strong local electric field in a wide spectral range. In this study, we provide a case for safety and fingerprint recognition of ethanol vapor at room temperature and atmospheric pressure.

Stationary, Continuous, and Sequential Surface‐Enhanced Raman Scattering Sensing Based on the Nanoscale and Microscale Polymer‐Metal Composite Sensor Particles through Microfluidics: A Review

“…SERS is an advanced analytical technique that works on the principle of enhancement of the Raman scattering signals when molecules are located on the roughened metallic surface. [ 11,13,46–48 ] Various analytes such as, soil contaminants, [ 49 ] fluid contaminants, [ 50 ] trace amounts of pesticides on foods, [ 51 ] trace concentrations of air contaminants, [ 52–55 ] explosives, [ 56 ] etc., are dispersed in the diverse environment of liquid, solid, or gaseous phases. It is an important objective to detect such types of targeting analytes with high specificity and sensitivity for healthcare and other purposes.…”

Nanomaterial-based surface-enhanced Raman scattering spectroscopy for sensing and diagnostics of gas molecules in environment and healthcare

“…The novelty of leaned pillars with Ag tips was their large aspect ratio, which provided flexibility for leaning towards nearby pillars, creating self-assembled electromagnetic hot spots when illuminated by the laser. A SERS ultrasensitive device to detect ethanol vapor composed of Ag NPs of size 60 nm modified polyvinylpyrrolidone (PVP) was proposed by Wang et al 102 Chen et al 103 demonstrated that Au@ZIF-8 core-shell nanostructures with 55 nm Au NPs and a shell thickness of 3 nm exhibited better SERS response for the detection of various VOC gas molecules, such as toluene, ethylbenzene, and chlorobenzene. Similarly, Xia et al proposed PDMS-coated 1-propanethiol-modification of Au@Ag NPs for enhanced sensitivity of various aromatic vapors in the atmospheric environment.…”

“…The novelty of leaned pillars with Ag tips was their large aspect ratio which provided flexibility for leaning towards nearby pillars creating self-assembled electromagnetic hot spots when illuminated by the laser. A SERS ultrasensitive device to detect ethanol vapor composed of Ag NPs of size 60 nm modified polyvinylpyrrolidone (PVP) was proposed by Wang et al[102]. Chen et a [103].…”

Tailoring of the Distribution of SERS-Active Silver Nanoparticles by Post-Deposition Low-Energy Ion Beam Irradiation

“…The controllable nanostructuring of surfaces by the formation of the nanoparticles of noble metals such as gold, silver and copper, which support the excitation of localized surface plasmon resonance (LSPR), are of increasing interest for a wide range of applications, such as non-linear optics, electronics, catalysis, sensing, enhanced hot-electron and photocurrent generation [ 1 , 2 , 3 , 4 ]. Controlled and reliable field enhancement (FE) effects associated with the excitation of plasmons in resonant metal nanostructures [ 5 , 6 , 7 ] are a potential key to the development of new sensors, and other practical applications of the surface-enhanced Raman spectroscopy (SERS) [ 1 , 8 , 9 , 10 , 11 ]. Silver is one of the metals with excellent plasmonic properties that can be used in the abovementioned fields [ 12 , 13 , 14 ].…”