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Mn1Ce1 and Mn0.9Co0.1Ce1 complex oxides were prepared by co-precipitation in hydrothermal conditions and their physicochemical properties were characterized with N2 adsorption, XRD, Raman, and SEM. The complex oxides show enough stability and catalytic activity for oxidative degradation of 4,4'-Dibromobiphenyl in sub-critical water. Mn0.9Co0.1Ce1 has higher activity than Mn1Ce1, indicating doping...
In the present work, we report the performance of grapheme-based gas sensors. Monolayer quality graphene was synthesized using thermal chemical vapor deposition. Graphene was characterized using Raman spectroscopy and Transmission electron microscopy. In addition, Hall Effect experiments were conducted to study the electronic properties of graphene layers. These graphene layers were tested to sense...
The nanofluid does not simply refer to a liquid-solid mixture. In general, these are effective methods used for preparation of suspensions: (1) to change the pH value of suspensions; (2) to use surface activators and/or dispersants; (3) to use ultrasonic vibration. In this work, Distilled water and Multi-walled carbon nanotubes were used to produce nanofluids. The carbon nanotubes were provided by...
Mixed acids which consists of HF, HNO3 are used as good etchant for pickling process of stainless steel and of HNO3, CH3COOH, H3PO4 are used as etchant for aluminum. The optical detection of concentration for such mixed acids is important to optimize and cut costs in the acid pickling process. The Raman spectroscopy technique has been employed to measure the concentration of mixed acid component within...
Organic contaminants are harmful to body health, and are usually contained in waste water, so it is necessary to determine and monitor them. The demand for real-time analysis and online examination of organic contaminants in water has presented a challenge to analytical and physical chemist. Raman Spectroscopy is a molecular vibrational spectroscopic technique, and Raman effect is caused by interactions...
A diphenyl bithiophene derivative (DPBT), which shows electrical bistability when tested in a two-terminal memory cell, has been extensively characterized with the aim to highlight the molecular root of the bistable behavior. A vibrational spectroscopic characterization has been carried out, supported by first-principles theoretical studies and X-ray analysis. Spectroscopic markers suitable to distinguish...
Three independent methods show clear evidence that pentacene layers grown on parylene C layer had better molecular microstructure compared to films grown on SiO2 surface. The electrical measurements confirmed these results and carrier mobility of 0.15 cm2 /Vs was obtained in OFET devices.
This paper introduces a method of modeling noninvasive glucose sensing for patients who suffer from diabetes mellitus. The proposed technique involves simulation of light propagation through biological tissue with an embedded photonic crystal. The proposed detection technique is Raman spectroscopy and the use of the photonic crystal enables the enhancement of Raman scattering by engineering the photon...
Laser Raman spectroscopy is an optical technique which is capable of in situ molecular identification of solids, liquids and gases, and is well suited to extreme environments. It is a type of vibrational spectroscopy which is non-invasive and does not require reagents or consumables. A laser excites a target, and the spectrum of the energy-shifted, back-scattered radiation serves as a "fingerprint"...
Depending on each nitrogen atom of adenine molecule to which silver atom of the metallic tip approaches, tip-enhanced near-field Raman spectroscopy exhibited atomic site selective sensitivity. According to molecular vibrational calculations, silver atoms and adenine molecule create several isomers generating specific vibration modes of each isomer.
Several nanoscale arrays of metallic, semiconductor, and organic carbon compounds (carbon nanopearls) have been fabricated on nanoporous flexible alumina and silicon templates based on a new self-assembly growth mode. They were obtained using pulsed laser deposition, thermal evaporation, e-beam evaporation, or RF magnetron sputtering. The different moieties that were observed include nanodomes and...
We report a novel form of high-resolution coherent-Raman spectroscopy which detects stimulated Raman gain effects using a cavity-ringdown technique. This is demonstrated by recording molecular rovibrational Raman spectra of methane gas
As IC performance increases, many technical challenges appear in the areas of power delivery, thermal management, I/O density, and thermal-mechanical reliability. To address these problems, the use of aligned carbon nanotubes (CNTs) is proposed in IC packaging as electrical interconnect and thermal interface materials. The superior electrical, thermal, and mechanical properties of CNTs promise to...
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