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This paper presents a comprehensive literature survey of MEMS based piezoelectric microphones along with the fabrication processes involved, application domains, and methodologies used for experimentations. Advantages limitations existing are presented impact process parameters during thin film growth. review identifies issues faced by microphone technologies spanning from invention to most recent state-of-the-art solutions implemented overcome or address them. A detailed comparison...

Metal-free γ-trifluoromethylation of Baylis–Hillman acetates is reported using Langlois’ reagent under visible light photoredox catalysis.

This study investigates the effect of varying amounts reduced graphene oxide (rGO) on optical direct band gap Polyaniline (PANI). The rGO/PANI composites (5 mg, 10 15 and 20 mg) were synthesized via in-situ polymerization. SEM, XRD, FTIR, UV-visible spectroscopy employed to assess morphology, crystallinity, structure, properties, respectively, Tauc-plot method calculate gaps. Results reveal strong interaction between rGO surface PANI's quinoid rings. Electrical properties show significant...

A new approach to multifunctionalized pyrroles has been explored by the tandem cyclization of α-oxoketene-N,S-acetals with β-ketodinitriles using Cu(MeCN)4BF4 and Ag2CO3 in toluene under reflux conditions. The reaction involves C–C/C–N bond creation, is assumed proceed via enamine formation, intramolecular cyclization, rearrangement. potential methodology also demonstrated for a gram-scale as well some useful organic transformations. offers practical pathway achieve polysubstituted broad...

An efficient visible-light-induced synthesis of trans-oxiranes has been accomplished via decarboxylative stereospecific epoxidation trans-cinnamic acids by aryldiazonium salts using CuCl, eosin Y, TBHP, and DBU. The reaction is facile, straightforward, endowed with good functional group tolerability a substrate scope.

A sensitive surface enhanced Raman scattering chemical sensor is demonstrated by using inexpensive gold-coated nanoporous anodic aluminum oxide substrates. To optimize the performance of substrates for sensing Surface-enhanced (SERS) technique, size nanopores varied from 18 nm to 150 and gold film thickness 30 120 nm. The sensitivity characterized detecting low concentrations Rhodamine 6G laser dye molecules. morphology SERS atomic force microscopy. Optical properties including...

A visible light-enabled synthesis of unsymmetrical ketones has been accomplished by the cross-coupling α,β-unsaturated carboxylic acids and aryldiazonium salts embracing a synergistic eosin Y Co(OAc)2·4H2O catalysis. The reaction involves decarboxylative aerobic CC bond cleavage, is endowed with creation new C-C C-O bonds good substrate scope.

A new strategy for the synthesis of amides has been developed using sulfur-mediated decarboxylative coupling cinnamic acids with amines via oxidative cleavage C═C bond.

A facile and sustainable protocol for the thiolation of hydrazones with sodium sulfinates has been developed in presence CuBr2 DBU DMF to afford diverse benzylic thioethers. Control experiments reveal a radical pathway involving thiyl as key intermediate.

In this paper the effect of different acid oxidation on morphology, dispersion and optical band gap multi-walled carbon nanotubes (CNTs) is reported. Oxidation CVD synthesized MWCNTs were carried out in 8M HNO3, H2SO4, HNO3/H2O2 H2SO4/HNO3. Oxidized sample characterized by XRD, SEM, FT-IR, TGA, UV-Vis spectroscopy Raman analysis. Oxidized-nanotubes show a lower shift XRD peak an increase d-spacing, which implies deterioration MWNTs. New peaks FT-IR spectra oxidized-nanotube samples at around...

A novel regiospecific C(sp3)–C(sp2) coupling between ethyl arylacetates and nitroarenes has been developed to deliver biaryl ketones in excellent yields. The protocol is metal-free, mild, compatible with a number of functional groups on both the reacting partners.

A technique involving a compact apparatus that combines the phase mask and two-beam interferometric techniques is presented. It involves use of to diffract ultraviolet (UV) beam cylindrical lens combined with pair mirrors produce two symmetric virtual line sources UV light. Bragg wavelength bandwidth fiber gratings can be controlled simple translation and/or mask. Using 40-mw continuous-wave frequency-doubled argon-ion laser at 244 mm single mask, series chirped in wide range around 600 nm...

Abstract A straightforward and new approach has been developed for the α‐functionalization of tertiary amines via sequential oxidative hydoxylation cross‐dehydrogenative coupling (CDC) arylboronic acids with to afford α‐phenolated amines. The results demonstrate an easy arylation C( sp 3 )−H bond in presence inexpensive readily available nickel metal salt. magnified image

Copper-catalysed decarboxylation/oxidative amidation of cinnamic acids and oxidative arylacetic with 2° amines have been developed leading to the formation α-ketoamides.