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In this paper, we describe results from a combined experimental and theoretical study of alkali atom deposition on semiconductors. Particularly, we have thoroughly investigated the surface-enhanced Raman scattering (SERS) properties of NiO and ZnO films doped with various alkali metals. Using the MTC-4 plasma reactor, we created various nanostructure films such as bare substrate, noble metal nanostructures (NiO, Pt, Pd), and films doped with Li, Na, K, Rb, Cs, Mg, Ca, Sr, and Ba. We explored the ability of the spectrometer to distinguish alkali metal types using the alpha and beta particle excitation during the etching experiments. The results of the measurements were compared to the results of theoretical calculations of the enhancement factors for various nanostructure arrays. We performed rigorous numerical simulations using COMSOL Multiphysics and RSoft’s Amber software for the determination of the enhancement factors. We were able to show that the nanostructure array containing only alkali metal atoms exhibits large enhancement factors compared to the arrays with both substrate and metal atoms. Generally, we find that the NiO:Li film has the highest enhancement factors among all the other metal-doped samples.
Substantial progress has been made in robotic fabrication, especially with the emergence of micro-electromechanical systems (MEMS) and microfluidic techniques. Yet, MEMS play a less important role in spectroscopic and trace analyte detection hardware as compared to luminous nonlinear optics (LNLO), which is the basis for high-performance biosensors. However, LNLO detection technologies have begun to penetrate portable and wearable analytical instrumentation. Here, MEMS integrated with LNLO techniques shows promise as a way to create the smallest, most versatile biosensors, as well as other similar devices.
A biosensing platform based on a MEMS mechanical cantilever array was used to detect the presence of various values of glucose levels in the blood. SPR is used in conjunction with plasmonic nanostructure arrays on the cantilever surface to create an ultrasensitive glucose biosensor. The nanostructure arrays have nanoscale apertures through which light incident to the cantilever surface is scattered. d2c66b5586