Networks of as-dispersed, polymer-wrapped (6,5) single-walled carbon nanotubes for selective Cu²⁺ and glyphosate sensing

Abstract

Networks of semiconducting single-walled carbon nanotubes (SWNTs) can be used as the transducing layer for sensors based on water-gated transistors. To add specific sensing capabilities, SWNTs are often functionalized with...

Glyphosate Separating and Sensing for Precision Agriculture and Environmental Protection in the Era of Smart Materials

“…The functionality of this semiconducting sensor relied on the n-doping resulting from Cu 2+ complexation by bipyridine. Adding GLP suppressed this complexation by competitive chelation of Cu 2+ , thus enabling the stoichiometric quantification of the herbicide analyte at nanomolar concentrations …”

“…Adding GLP suppressed this complexation by competitive chelation of Cu 2+ , thus enabling the stoichiometric quantification of the herbicide analyte at nanomolar concentrations. 137 Likewise, GLP was selectively determined using an amperometric sensor containing glycine oxidase, a flavoenzyme, immobilized on a platinum-decorated laser-induced graphene scaffold. Exquisite electronic and solid properties, including the LDCR of 10−260 μM and the LOD of 3.03 μM, allowed for selective determination of GLP with only minimal interference of common herbicides and insecticides, including atrazine, 2,4-dichlorophenoxyacetic acid, dicamba, parathionmethyl, paraoxon-methyl, malathion, chlorpyrifos, thiamethoxam, clothianidin, and imidacloprid.…”

“…Various methods have been used to determine or extract traces of GLP and AMPA from liquids, solids, and plants (Table ). Multimethod approaches, including chromatography, − adsorption-extraction systems, ,,,, optical, ,,− electrochemical, ,,− ,,,− and scanning-probe techniques, immunochemistry, − and microfluidic LOCs ,,− exploit modern GLP-sensitive materials to detect and analyze, as well as to extract and degrade, GLP traces. Hybrid nanomaterials used in these approaches include enzymes (AChE, ESPS), deoxyribonucleic acid (DNA)- or antibody-based aptamers, immune-magnetic conjugates, MIPs, and inorganic materials.…”

“…Adding GLP suppressed this complexation by competitive chelation of Cu 2+ , thus enabling the stoichiometric quantification of the herbicide analyte at nanomolar concentrations. 137 …”

Ratiometric fluorescent sensing of pyrophosphate with sp³-functionalized single-walled carbon nanotubes

“…In combination with their high photostability and biocompatibility, SWNTs are an excellent material for the development of biosensors 6 – 8 . Over the last decade various SWNT-based biosensors have been developed that are sensitive to, for example, bacterial motifs 9 , reactive oxygen species 10 , metal ions 2 , 11 , proteins 12 , and neurotransmitters such as dopamine 13 . One drawback of SWNTs is their typically low PL quantum yield (PLQY) (<1%) in aqueous dispersion and the low purity of the raw material.…”