SENSOR COMPOUNDS AND ASSOCIATED METHODS AND DEVICES
申请人:UNIVERSITY OF UTAH RESEARCH FOUNDATION
公开号:US20180201612A1
公开(公告)日:2018-07-19
Methods of detecting a non-explosive analyte can include exposing a sensor compound to a non-explosive analyte and displaying a change in the sensor compound upon exposure of the sensor compound to the non-explosive analyte. A variety of sensor compounds for detecting a target analyte, including both explosive and non-explosive analytes, is also described. Sensor devices for detecting a target analyte can include a substrate and a sensor compound positioned on the substrate in a plurality of detection zones.
Well-defined ultrathin nanoribbons have been fabricated from an amphiphilic electron donor acceptor (D-A) supramolecule comprising perylene tetracarboxylic diimide as the backbone scaffold to enforce the one-dimensional intermolecular assembly via strong a-stacking. These nanoribbons demonstrated high photoconductivity upon illumination with white light. The high photoconductivity thus obtained is likely due to the optimal molecular design that enables a good kinetic balance between the two competitive processes, the intramolecular charge recombination (between D and A) and the intermolecular charge transport along the nanoribbon. The photoconduction response has also proven to be prompt and reproducible with the light turning on and off. The photogenerated electrons within the nanoribbon can be efficiently trapped by the adsorbed oxygen molecules or other oxidizing species, leading to depletion of the charge carriers (and thus the electrical conductivity) of the nanoribbon, as typically observed for n-type semiconductor materials as applied in chemiresistors. Combination of this sensitive modulation of conductivity with the unique features intrinsic to the nanoribbon morphology (large surface area and continuous nanoporosity when deposited on a substrate to form a fibril film) enables efficient vapor sensing of nitro-based explosives.
Enhancement of visible-light-driven photocatalytic H 2 evolution from water over g-C 3 N 4 through combination with perylene diimide aggregates
作者:Shuai Chen、Chen Wang、Benjamin R. Bunes、Yingxuan Li、Chuanyi Wang、Ling Zang
DOI:10.1016/j.apcata.2015.03.026
日期:2015.6
Graphitic carbon nitride (g-C3N4) is among the most promising metal-free photocatalysts for H-2 production from solar-driven water reduction. However, the photocatalytic efficiency of bulk g-C3N4 powders is limited. In this work, molecular aggregates of perylene tetracarboxylic diimides (PTCDIs, a robust class of air-stable n-type organic semiconductor) were loaded via solution processing on the surface of g-C3N4, which is pre-deposited with cocatalyst Pt nanoparticles. The PTCDIs/Pt/g-C3N4 composites thus fabricated exhibit broader visible-light response than Pt/g-C3N4, and possess excellent photochemical stability. The initial intramolecular charge transfer features of the PTCDIs, as well as their energy levels being matched to g-C3N4, ensure subsequent charge separation in the PTCDIs/Pt/g-C3N4 composites. When the composites are dispersed into aqueous solutions containing triethanolamine as a sacrificial electron donor, a tenfold enhancement of H-2 evolution activity (similar to 0.375 mu mol h(-1)) is achieved compared to bare Pt/g-C3N4 under visible-light (lambda >= 420 nm) irradiation. (C) 2015 Elsevier B.V. All rights reserved.
[EN] SENSOR COMPOUNDS AND ASSOCIATED METHODS AND DEVICES<br/>[FR] COMPOSÉS DE DÉTECTION ET PROCÉDÉS ET DISPOSITIFS ASSOCIÉS
申请人:UNIV UTAH RES FOUND
公开号:WO2017008074A1
公开(公告)日:2017-01-12
Methods of detecting a non-explosive analyte can include exposing a sensor compound to a non-explosive analyte and displaying a change in the sensor compound upon exposure of the sensor compound to the non-explosive analyte. A variety of sensor compounds for detecting a target analyte, including both explosive and non-explosive analytes, is also described. Sensor devices for detecting a target analyte can include a substrate and a sensor compound positioned on the substrate in a plurality of detection zones.