A nanogap formed by a metal nanoparticle and a flat metal substrate is one kind of “hot site” for surface-enhanced Raman scattering (SERS). The characteristics of a typical nanogap formed by a planar Au and either an Au and Ag nanoparticle have been well studied using 4-aminobenzenethiol (4-ABT) as a probe. 4-ABT is, however, an unusual molecule in the sense that its SERS spectral feature is de...

Abstract In recent years, label-free sensors have been studied extensively for biomolecule detections. Label-free biosensors based on MOSFETs could achieve high detection sensitivity, the subthreshold swing of such cannot break limitation 60 mV Dec −1 due to physical mechanism thermal electron emission. However, less than can be achieved in tunnel FETs working band tunneling (BTBT) mode. Usuall...

We propose and analyze the "complementary" structure of a metallic nanogap, namely, the metallic nanowire for magnetic field enhancement. A huge enhancement of the field up to a factor of 300 was achieved. Introducing the surface impedance concept, we also develop and numerically confirm a new analytic theory which successfully predicts the field enhancement factors for metal nanostructures. Co...

We report fabrication and characterization of a novel real-time, label-free DNA detector, that uses a long nanofluidic channel to stretch a DNA strand and a nanogap detector (with a gap as small as 9 nm) inside the channel to measure the electrical conduction perpendicular to the DNA backbone as it moves through the gap. We have observed electrical signals caused by 1.1 kilobase-pair (kbp) doub...

In this article, a charge-plasma (CP)-based double gate schottky barrier FET structure has been investigated using dielectric controlled biomolecule sensor. The use of Hafnium as charge plasma at the source side encourages an n + in un-doped silicon region, which expressively decreases Schottky thickness. oxide below Metal M1 and M2 is etched out to create nanogap openings for finding. Here, ex...

Interest in biosensors based on field-effect transistors (FETs), where an electrically operated gate controls the flow of charge through a semiconducting channel, is driven by the prospect of integrating biodetection capabilities into existing semiconductor technology. In a number of proposed FET biosensors, surface interactions with biomolecules in solution affect the operation of the gate or ...

Using saturated alkyl chain series with a dithiol anchor group, we systematically examined the intrinsic charge transport of single-molecule junctions in an electromigrated nanogap electrode. The saturated alkyl molecular system constitutes an important control series in molecular transport experiments to corroborate valid molecular junctions, because molecular energy levels remain nearly uncha...

Abstract The optical and electrical characteristics of electrically-driven nanogap antennas are extremely sensitive to the region where fields tightly confined electrons photons can interplay. Upon injecting in nanogap, a conductance channel opens between metal surfaces modifying plasmon charge distribution therefore inducing an tuning gap resonance. Electron tunneling across be harnessed induc...

Nanogap devices have applications in single molecule sensing and single molecule transistors. Nanogap devices comprised of a gold nanowire with a nanoscale gap containing C60 were fabricated using electromigration on a silicon substrate. Raman spectra were obtained for various features of this device in order to detect the presence of C6o and study its electronic properties. The 532 nm laser so...