Bridging Nanowires for Enhanced Gas Sensing Properties

It is crucial to develop new bottom-up fabrication methods with control over the physical properties of the active materials to produce high-performance devices. This article reports well-controlled, without seed layer and site-selective hydrothermal method to produce ZnO bridging nanowires sensors. By controlling the growth environment, the performance of the sensor became more efficient. The presented on-chip bridging nanowire sensor enhanced sensitivity toward acetone gas (200 ppm) around 63 and fast response time (420 ms) and recovery time (900 ms). The enhancement in the speed of response and recovery is ascribed to the exceptional NW-NW junction barrier that governs the sensor’s conductivity, and the excellent contact between ZnO nanowires and Au electrodes.

Formalism of Biological Tissues/Nanowire Sensor Interface Behavior

In this paper, we investigate the behaviour of biological tissues (skin) coupled to a flexible sensor embedded at a solid substrate based on a numerical model taking into account the relationship between strain/stress components at the interface. Based on this study, the most appropriate biomechanical factors are understood and quantified in order to optimize the sensor/biological tissue interface conditions. A micromechanical description based on a mathematical formulation has been developed to evaluate the biomechanical behaviour provided by a 2D viscoelastic model of Kelvin-Voigt. Based on the results, it appears that the model can be used effectively to characterize in-vivo the dynamic properties of soft tissues in order to adapt the biophysical properties of flexible sensors dedicated to optimal adhesion

A single nanowire sensor for intracellular glucose detection

We report for the first time the development of a single nanowire electrochemical sensor for the detection of intracellular glucose levels.

Nanowire-Based Biosensors: From Growth to Applications

Over the past decade, synthesized nanomaterials, such as carbon nanotube, nanoparticle, quantum dot, and nanowire, have already made breakthroughs in various fields, including biomedical sensors. Enormous surface area-to-volume ratio of the nanomaterials increases sensitivity dramatically compared with macro-sized material. Herein we present a comprehensive review about the working principle and fabrication process of nanowire sensor. Moreover, its applications for the detection of biomarker, virus, and DNA, as well as for drug discovery, are reviewed. Recent advances including self-powering, reusability, sensitivity in high ionic strength solvent, and long-term stability are surveyed and highlighted as well. Nanowire is expected to lead significant improvement of biomedical sensor in the near future.

Zinc Oxide Nanowire Sensor Packaging

This paper describes nano device packaging topology using array of ZnO nanowire-based devices. The single nanowire device has been fabricated through focused ion beam and e-beam lithography techniques while the SEM and EDAX analysis have been used to characterize the device. The IV characteristics of the ZnO nanowire-based array devices have been measured through a semiconductor parameter analyzer.