Chemical sensing with Au and Ag nanoparticles

Abstract

Noble metal nanoparticles (NPs) are ideal scaffolds for the fabrication of chemical sensing devices with either optical or electrical readout combining high sensitivity and selectivity, along with fast response and full reversibility.

Fluorescent Chemosensors Based on Polyamine Ligands: A Review

“…In order to obtain more efficient, selective, and sensitive chemosensors, an increasing number of papers have recently appeared in which the chemosensor is anchored to different nanosized supports [83][84][85][86]. One of them, boehmite nanoparticles, which is an aluminum oxyhydroxide (γ-AlO(OH)), presents different advantages such as the possibility to make fluorescence emission studies in pure water with little scattering, and the recovering of the sensor system after their use by centrifugation because a change from a sol to a gel state occurs at basic pH.…”

Universal Fabrication of Highly Efficient Plasmonic Thin‐Films for Label‐Free SERS Detection

“…[ 4 ] Despite the several advantages of colloidal NPs in solution (i.e . , high reproducibility, cost‐effectiveness, or tailored optical properties), [ 12 ] it is well‐known that hot spots can only be achieved through dynamic and uncontrolled aggregation processes, usually taking place in the presence of the analyte. Aggregation heavily affects and limits the overall robustness of these SERS sensors in real‐life applications, since the reproducibility of the spectra is strongly dependent on the experimental conditions.…”

Harnessing selectivity in chemical sensing via supramolecular interactions: from functionalization of nanomaterials to device applications

“…This journal is © The Royal Society of Chemistry 2021 the environment drive their application as sensitive elements in chemical sensing. [1][2][3][4][5][6][7][8] They allow prompt reconfiguration of the architectures of the sensor, whose response to the detection of the chosen analyte becomes no longer limited by extrinsic factors such as the slow diffusion of target molecules through the active material or the presence of structural traps for small molecules/ions. The unique features of LDMs determine the highest responsiveness, sensitivity, and reversibility combined with the lowest limit of detection (LoD) in the sensing process.…”

“…In particular, 0Dnanoparticles (NPs), 1D -nanotubes (NTs), nanowires (NWs), and nanofibers, as well as 2D -metal-/covalent-organic frameworks, graphene, and related materials represent the ideal sensory components to be readily integrated into devices. 4,[9][10][11][12][13] The interaction between LDMs and analytes should preferably occur at the non-covalent level. 14 LDM-analyte covalent binding should be avoided as it leads to irreversible interactions, being suitable only for single-use disposable sensors.…”

“…), pharmaceutical agents, to name a few. 4,8,9,11,17 The greater the structural and chemical complexity of the analyte (e.g., large molecules with numerous and different chemical groups), the more challenging is the receptor design. For instance, to ensure the selective detection of metal cations (a class of relatively simple analytes), their size (ionic or hydrated radius), charge density, and 'hardness' are the important characteristics to be considered.…”