Functionalized polysilsesquioxane film fluorescent sensors for sensitive detection of polychlorinated biphenyls

Recent Advances in Spectroscopy Technology for Trace Analysis of Persistent Organic Pollutants

“…The fluorescence enhancement was contributed to the fluorescence energy transfer from CdTe QDs to BaP. Beyond these, fluorescent sensors functionalized with polysilsesquioxane film can be used to detect PCBs, based on the mechanism that their fluorescence emission intensity decreased steadily with a corresponding increase in PCBs, which was shown in Figure 6B [82]. The detection limit of PCB77 came up to 8.03 × 10 −7 mol•L −1 .…”

“…Sensitivity of fluorescent sensors strongly depends on the nanostructure and morphology of the sensing film. Such sensors can be used to determine trace POPs by functionalizing the chip surface with functional groups to effectively preconcentrate targeted molecules [82,83]. For example, optosensors based on the online immobilization of BaP using Amberlite XAD-4 could detect BaP in a continuous-flow system with the limit of detection up to 3 ng•L −1 [84].…”

Glycidyl alkoxysilane reactivities towards simple nucleophiles in organic media for improved molecular structure definition in hybrid materials

“…to create a modied precursor bearing alkoxysilane functions that will be hydrolyzed in a second step. 19,20 Based on these strategies, challenges and problems appeared due to the reactivities of both functions, which are highly dependent on the reaction conditions: solvent (aqueous, organic, ionic liquid media), temperature, concentration, catalyst, and acidic or basic conditions. All these parameters markedly inuence the reactions taking place and complicate the formation of covalent links on both types of function on the silane, necessary in the synthesis of class II hybrids.…”

An Electrochemical Immunosensor for Sensitive Detection of Cardiac Troponin I Based on the Amplification Effect of Asymmetric Bowl-Shaped Mesoporous Nanospheres

“…11 In recent decades, asymmetric nanoparticles as new type of materials have been used in biotechnology, storage and energy production. [12][13][14][15][16][17][18][19][20][21][22] In terms of electrocatalysis, various symmetrical materials have achieved sufficient performance in immunosensors, especially for the materials with spherical and rod-like morphologies. 23,24 While the asymmetric nanomaterials have more advantages than the symmetrical ones, which can promote the electron transfer and realize the spatial control of the catalytic interface.…”