The screen-printed electrode (SPE) sensor is widelyemployedin food analysis, environmental health monitoring, disease detection, toxin detectionandother applications.As it crucial for the SPE to have an outstanding performance, this study examined effects of manipulatingthe working electrode(WE)radius, gap spacing between electrodes, and counter (CE) width on performance sensor.Finite element s...

We present a low-cost electrochemical DNA biosensor based on printed circuit board (PCB) electrodes for wastewater monitoring using portable PCR instruments, such as miniPCR®, without the requirement qPCR reagents. PCB are attractive candidates and sensitive biosensors of relevance in pandemic COVID-19, facilitate opportunity to map disease spread Low-Middle Income Countries (LMICs) through env...

Current technologies are lacking in the area of deployable, in situ monitoring of complex chemicals in environmental applications. Microorganisms metabolize various chemical compounds and can be engineered to be analyte-specific making them naturally suited for robust chemical sensing. However, current electrochemical microbial biosensors use large and expensive electrochemistry equipment not s...

In this work, hierarchical WO3 core-shell microspheres were synthesized via a facile template-free precipitation method. Gas sensing properties of the synthesized powder to acetone and some other volatile organic compounds were comparatively investigated with commercial WO3 nanoparticles. The synthesized and commercial powders were characterized by X-ray diffraction, scanning electron microscop...

Abstract We report the electrical detection of captured gases through measurement quantum tunneling characteristics gas-mediated molecular junctions formed across nanogaps. The gas-sensing nanogap device consists a pair vertically stacked gold electrodes separated by an insulating 6 nm spacer (~1.5 sputtered α-Si and ~4.5 ALD SiO 2 ), which is notched ~10 into stack between electrodes. exposed ...

Thin films of ferric ferrocyanide (Prussian Blue) were electrochemically deposited on interdigitated array (IDA) electrodes yielding systems which can be considered as chemiresistors in sensing alkali ion concentrations in an adjacent electrolyte. From the dependence of the steady-state current on the electrode (bias) potential at variable cation concentrations for different alkali ions and for...

Nanofluidic channels are unique bioanalytical tools that can separate, detect, analyze and concentrate biomolecules. Embedding electodes in such systems increases the functionality by allowing for unique flow control, label-free sensing, and concentration enhancement. In this work, we describe the fabrication process of nanofluidic channels with integrated electrodes, as well as the characteriz...