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With oleyamine as solvent and reduce agent, Au nanoparticles (AuNPs) are in situ grown on graphene oxide (GO) sheets. Thereafter, porous-layered stack of AuNPs-rGO nanosheets is formed by a gas-phase chemical-reduction step. After the AuNPs modified with 11-mercaptoundecanoic acid (11-MUA) to graft — COOH sensing groups to amine, the functionalized AuNPs-rGO porous-stacked nanosheets are loaded onto...
A resonant micro-cantilever chemical sensor with integrated piezoresistive self-sensing function is presented. On the micro-cantilever surface, multi-wall carbon nanotubes (CNTs) are immobilized and modified with specific sensing groups. Owing to the high specific-surface-area of MWCNTs and high-effective sensitive groups, the sensor has been used to detect sub-ppb trace-level trinitrotoluene (TNT)...
Reported is a surface-stress sensing microcantilever with signal readout piezoresistor encapsulated by electrically insulated SiO2 for detecting bio/chemical molecules in liquid. Specifically sensitive siloxane-based molecule monolayers or bi-layer is directly modified on the SiO2 surface via reliable Si-O covalent bond that secures sensitivity stability and long-life working of the sensor. The sensors...
Mass-loading detection of two sorts of analyte with a single resonant micro-cantilever is proposed and experimentally validated. By exciting the cantilever in different resonance modes and adsorbing the different analytes at different locations of the cantilever, the specific mass of either sort of analyte can be independently detected. The proposed micromechanical resonant cantilever sensor is designed...
A SiO2 quad-cantilever micro-sensor with a self-sensing piezoresistor integrated is developed for on-the-spot chemical detection. Four piezoresistors are integrated in four cantilevers and the sensing signal is outputted from a half-sensitive Wheatstone bridge. The new single-sided micromachining process features low-cost and high-yield. Modified with a novel self-assembled monolayer (SAM) on two...
The paper reports a novel static cantilever sensor (surface-stress-style) with long-term repeatable detecting sensitivity to trace TNT vapor. A siloxane-based TNT-sensitive bi-layer is self-assembled directly on the SiO2 surface of the surface-stress-style micro-cantilever. This method is, for the first time, used to replace the traditional self-assembled monolayers (SAMs) of thiols on Au (111) surface...
This paper reports a method for recycled immobilizing and erasing antibody at micro-cantilever surface by a coordination-bond breaking and re-linking technique. With the new method, the sensor can be re-used to immuno-detect bio-molecules for many times. By our sensing experiment to killed vaccine of Bacillus Anthracis (BA) spores with concentration of 2000 spores/ml for three times, the target loaded...
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