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In this paper, metal-organic framework (MOF) is explored as xylene sensing-material for resonant-cantilever gas sensor. Sensing experiment with the MOF nano-material of HKUST-1 demonstrates that 400 ppb xylene can be detected. This limit of detection (LOD) has been lower than the human olfactory threshold. The sensing mechanism is identified as the interaction between MOF and xylene. The specificity...
This paper reports a new method to ensure resonant micro-sensor long-time resonating in solution for real-time biochemical sensing/analysis. By designing a water-proof ‘diving-suit’ for the cantilever resonator and an anti-leakage narrow ‘slit’ to free the cantilever vibration, only the sensing-region of the cantilever contacts to analyte solution, while the other parts are remained in air to keep...
Recent studies have suggested that endogenous electric fields can not only be considered as an observation window of neural activities but also form a feedback on membranes of adjacent cells which implies it may play an important role in network dynamic behaviors. However, the role of endogenous field feedback in the detectability of external weak signal is still unknown. In this study, we introduced...
To high-performance detection of ultra-low concentration explosive vapor, we develop resonant microcantilever sensors by using a nano sensing material of functionalized GO/Au-NPs (gold-nanoparticles in situ grown on graphene-oxide sheet). To achieve specific-modification for fine selectivity and enlarge graphene surface-area for fast capturing the gas-molecules, surface-modified graphene-oxide sheets...
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 here is a high-performance resonant micro-cantilever sensor with integrated micro-heater for both optimal resonance-excitation and speed-up analyte desorption after detection. By optimized designing the integrated heating-resistor, ultra-stable resonant frequency is measured that helps to realize a high resolution of mass detection. 130fg mass resolution is realized in atmospheric air with...
A novel hexa-fluoro-isopropanol-functionalized mesoporous-silica (HFMS) is constructed and loaded on integrated resonant micro-cantilevers for specific detection of trace-level trinitrotoluene (TNT) vapor. With an ultra-high specific-surface-area, an ultra-dense specific sensing-groups and an optimized pore size, the micro/nano combined cantilever sensors have shown TNT detection-limit of about 10...
The paper reports a hyper-branched polymer functionalized on resonant micro-cantilevers to detect trace-level chemical vapor of dimethyl methylphosphonate (DMMP, simulant of sarin). The hyperbranch-polymer with functional-groups is directly constructed onto cantilever-surface by layer-to-layer step-growing monomers with an A2+B4 composition, where A2 and B4 are complementary interaction-groups for...
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