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THz metamaterials are designed and fabricated. The resonance frequency of the SRRs (split ring resonators) based on thin film and nanoparticles is studied. Nanoparticle constituted metamaterial has a good absorb of THz spectrum. We compare the properties between thin film metamaterials and nanoparticles metamaterials. The transmission spectra of Au metamaterial was measured. The redshift was obtained...
We have fabricated titanium nitride (TiN) thin films on sapphire substrates by pulsed laser deposition (PLD) technique, and excited surface plasmon polaritons (SPPs) on TiN thin films by energy transfer from dye molecules. The system was fabricated by depositing a thin polymer layer containing rhodamine 6G (R6G) on a TiN thin film, separated by a thin spacer made of silica. The SPPs were excited by...
We employed the large surface-to-volume ratio of nanoporous gold (NPG) to build a set of highly sensitive superoxide electrochemical biosensors. Once functionalized with cytochrome-c (cyt-c) the NPG-based electrodes displayed a superoxide sensitivity of 0.24 nA nM−1 and a low-level of detection of 5 nM towards superoxide. The planar electrodes were then interfaced with HUVEC cells and were able to...
Near-infrared (NIR) responsive nanoparticles (NPs) like gold nanorods (GNRs) are important in biomedical fields because of their transparency for biological tissues. Although GNRs are sought after as contrast agents for theranostics in cancer studies, capping ligands like cetyl trimethyl ammonium bromide (CTAB) used for the GNR synthesis are toxic for biological tissues. This work aimed to develop...
Multi-walled carbon nanotubes (MWCNTs) have been used to improve the lifetime of electrical contacts of MEMS switches. The surface, usually gold-coated, demonstrates a complex structure. Due to the space between vertically aligned nanotubes, the sputtered gold penetrates into CNT. The surface of the composite also presents a much higher roughness than metal-coated surfaces. This work investigates...
The present investigation reports a facile method for the biosynthesis of gold nanoparticles from the rind extract of Garcinia mangostana, a medicinal plant which acts as a reducing agent. It was observed that the aqueous gold ions, when exposed to the rind extract of G.mangostana were reduced in the solution, thereby leading to the formation of gold nanoparticles (GMREGNP). The structural characterization...
Single-Walled Carbon Nanotubes (SWCNTs) have been shown to be a promising candidate for flexible electronics, especially logic circuits. However, very little study on SWCNT based analog circuit elements, such as amplifiers and comparators, on flexible substrates has been reported. For practical applications, fully functional flexible electronic devices must have an analog input circuitry to achieve...
Graphene-based noble metal nanocomposites have attracted tremendous research interest in the fields of surface-enhanced Raman scattering (SERS) recently. However, efficient utilization as SERS substrates has been impeded by the difficulty of tuning SERS enhancement effects induced from chemical and plasmonic enhancement by different preparation methods of graphene. Herein, three kinds of graphene-based...
The nonlinear response of zinc oxide and zinc oxide-gold hybrid colloidal nanostructures to 532 nm nanosecond pulses was investigated. The z-scan technique was used to measure the nonlinear absorption of zinc oxide, zinc-oxide: gold hybrids and mixed colloids of zinc-oxide and gold. Despite similar zinc oxide concentrations, the colloids containing gold nanoparticles displayed stronger intensity dependent...
Two types of gold-supported TiO2 catalysts (anatase and rutile) were prepared using a deposition precipitation method, and their photocatalytic activity towards CO2 reduction was tested in the gas phase using H2O as an electron donor and a xenon lamp as the energy sources. The crystal structures were verified using a scanning electron microscope (SEM) and the loaded Au nano-particles (NPs) had no...
Light-driven self-assembly of two coupled gold nanorods (GNRs) was studied theoretically. We analyzed the optical forces and torques on both GNRs. Our results show that due to the plasmon-mediated light-matter interaction two adjacent GNRs could coalesce in the end-to-end or side-by-side manner, depending on the wavelength and their initial configurations.
Nanopatterning of Au-nanoarray on an indium tin oxide (ITO) electrode using efficient and low-cost nanospheres lithography (NSL) is reported. Convective self-assembly of 500 nm polystyrene (PS) nanobeads was found to effectively provide a well-ordered monolayer template for Au deposition with the coverage of about 90% on ITO. A simple Au-nanoparticles (AuNPs) spin coating was performed. It is observed...
We present a method of determining the mass of a single picogram particle by observing its Brownian motion near the bottom of a droplet of water. The motion of the particle caused by thermal fluctuation is restricted within a narrow region because of gravity, and the vertical displacement of the particle from the bottom of the droplet depends on its mass. Since the particle is trapped inside the droplet,...
This paper describes the development of a photoacoustic microsensor for noninvasive glucose monitoring in human blood. The microsensor, based on capacitive sensing, is comprised of a resonant type cantilevered sensing element, sensitive to acoustic pressure and a rigid back plate electrode. Both parts of the sensor are fabricated separately. To eliminate external biasing requirement, an electret is...
In this work, 5 nm Au film was deposited on 100 nm polystyrene (PS) nanobeads and tuned by three different temperatures of a short rapid thermal annealing (RTA) process, 250°, 500° and 750°. Results show that structural alteration of Au-film morphology due to RTA led to a gradual enhancement of SERS response on the detection of Rhodamine 6G (R6G) Raman probe achieving the highest enhancement factor...
We fabricated single electron transistors (SETs) by using gold nanoparticles as their islands. With a simple method of the fabrication, characteristics of capacitively-and resistively-coupled SETs (C-SETs and R-SETs) were achieved at 77 K and room temperature.
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