Chemical sensors based on π-conjugated organic molecules and gold nanoparticles

Abstract

Scientists have developed techniques for synthesizing and characterizing many new materials including conjugated small molecules, polymers and gold particles protected by conjugated organic chromophores for testing specific sensing properties in the past decade. Still, the design and synthesis or supermolecular systems fabrication of novel materials with controlled sensing properties is a significant and ongoing challenge within nanoscience and nanotechnology. Recently, our group has successfully constructed a series of chemosensors using small organic molecules, conjugated polymers and gold nanoparticles for real-time detection of specific analytes. The chemosensors show high selectivity and sensitivity in the detection of cations and biologic analytes and thus are potentially promising for applications in sensing assay system. In this review, recent sutdies on the design, synthesis and photo-physical properties of novel materials and construct of chemosensors are summarized with an emphasis on the development in our groups in recent years. energy transfer, charge transfer, nanotechnology, organic-inorganic hybrid composites.

Fluorescent Sensing of Fluoride in Cellular System

“…They should respond selectively and sensitively to fluoride ions in a complex system that exploits effective fluorescence transduction mechanisms. In general, the mechanisms of fluorescence transduction involves manipulation of electron transfer on binding of the analyte by the probes, including photoinduced electron transfer (PET) 9 , intramolecular charge transfer (ICT) 10 , fluorescence resonance energy transfer (FRET) 11 , excited-state intramolecular proton transfer (ESIPT) 12 and so on.…”

Laser Spectroscopy for Atmospheric and Environmental Sensing

“…Also, recent reports on PL-based microarrays and artificial noses [ 394 - 400 ] were not discussed in detail. Moreover, the significant works on PL-based thin films [ 401 - 403 ], silica gels [ 404 , 405 ], and/or other nanomaterials [ 406 - 408 ] have not been targeted for this review. Likewise, novel studies such as those involving VOC interactions with PL marine diatoms were also excluded [ 409 , 410 ].…”

Highly Selective and Ultrasensitive Turn-on Luminescence Chemosensor for Mercury (II) Determination Based on the Rhodamine 6G Derivative FC1 and Au Nanoparticles

“…Interestingly, they are excellent quenchers of organic fluorophores via resonance energy transfer (RET) and can efficiently quench the molecular-excitation energy in the chromophore–AuNP composite [27]. In this sense, the quenching property of AuNPs has been employed in several chemosensing schemes [28,29], and many approaches have been used for Hg 2+ determination using AuNPs, being an area of current interest [30,31,32,33,34,35,36]. Usually, the RET process occurring in a bimolecular dye-quencher system through single dipole–dipole interaction is the Förster RET (FRET) [37].…”