Molecularly imprinted polymer–Ag₂S nanoparticle composites for sensing volatile organics

Abstract

Polyurethane-based molecularly imprinted polymers (MIP) and Ag 2 S nanoparticles (NP) form a nanocomposite that is suitable for detecting vapours of aliphatic alcohols with quartz crystal microbalance (QCM) sensors. The resulting sensor responses are almost three times higher than the average response of its two constituents: the composite leads to a normalized response of À70 Hz towards 400 ppm 1-butanol vapour in air, which is two times more than for a pure NP layer of the same thickness and four times higher than the response of the MIP. Furthermore, the MIP leads to structural selectivity that strongly prefers 1-butanol over 2-butanol due to the branched structure of the latter. Selectivity reaches a factor of almost five.

A molecularly imprinted electrochemical enzymeless sensor based on functionalized gold nanoparticle decorated carbon nanotubes for methyl-parathion detection

“…20,21 Because of its highly selective recognition and a wide choice of templates and functional monomers, molecular imprinting technique (MIT) has attracted increasing attention. [22][23][24][25][26][27] Because of their unique advantages over natural biological receptors in terms of physical and chemical stability, ease of preparation, low cost, and applicability in harsh environmental conditions, [28][29][30] molecularly imprinted polymers (MIP) have been widely explored for mimicking natural receptors. [31][32][33] However, a variety of traditional imprinted materials suffer from certain drawbacks including small binding capacity, slow mass transfer and irregular material shape.…”

MOLECULARLY IMPRINTED POLYMER NANOPARTICLES (MIP-NPs) APPLICATIONS IN ELECTROCHEMICAL SENSORS

“…Hence, MIPs can be re-developed into MIPs nanoparticles (MIP-NPs), which have greater potential. As known, the properties of nanoscale materials are substantially distinct from bulk matrices due to strong adsorption efficiency, high surface to volume ratio, high surface reactivity, high solubility, better diffusion, and ease of immobilization [3,4].…”

Molecularly Imprinted Polymer Nanoparticles for Formaldehyde Sensing with QCM

“…Nonetheless, both systems rely on polymer–nanoparticle composites. Those pre-concentrate formaldehyde on the surfaces of affinity materials, which is an approach that has proven useful also for other volatile pollutants [ 26 ]. Herein, we report the design of single-phase recognition materials based on MIPs for assessing formaldehyde vapor concentrations in flow systems for direct gas phase detection of this analyte.…”