13191-37-2Relevant articles and documents
Self-assembled buffer layer from conjugated diblock copolymers with ethyleneoxide side chains for high efficiency polymer solar cells
Shi, Yueqin,Tan, Licheng,Chen, Lie,Chen, Yiwang
, p. 8054 - 8064 (2014)
In this article, we present a novel and promising approach to enhance the device performance and stability by the simple incorporation of all conjugated polythiophene diblock copolymers, poly(3-hexylthiophene)-b-poly(3-triethylene glycol thiophene) (P3HT-b-P3TEGT), into the active layer based on inverted device structures. During the spin-coating process, the triethylene glycol side chains of P3HT-b-P3TEGT would spontaneously migrate vertically towards the active layer surface and form a nanoscale self-assembled anode buffer layer, which simultaneously drives the orderly packing of donor polymer chains and vertical phase separation morphology, allowing electrons and holes to move more efficiently to the respective electrode. Moreover, the nanoscale self-assembled buffer layer can form interfacial modification and ohmic contact between the active layer and Ag (or MoO3/Ag) electrode, reduce the contact resistance of the device, and increase the electrical conduction of the device, especially upon chelating lithium ions (Li+) to the triethylene glycol side chains of P3HT-b-P3TEGT. Combining the above advantages, the efficiency and stability of the polymer solar cells are enhanced. A remarkable improvement in the PCE with 7.3% (measured in air) is obtained for PBDTTT-C-T:PC71BM devices. This journal is
Design and synthesis of fluorescence "turn-on" chemosensors based on photoinduced electron transfer in conjugated polymers
Fan, Li-Juan,Zhang, Yan,Jones Jr., Wayne E.
, p. 2844 - 2849 (2005)
A new approach to fluorescence "turn-on" chemosensors based on a photoinduced electron transfer (PET) strategy involving conjugated polymers has been developed. Two new conjugated polymers dea-PPETE and tmeda-PPETE were synthesized and characterized. These two polymers use diethylamino and N,N,N'-trimethylethylenediamino as receptors, respectively, on a poly[p-(phenyleneethylene)-alt-(thienyleneethynylene)] (PPETE) fluorescent conjugated polymer backbone. The polymers were found to be relatively weakly emissive at λmax ～ 488 nm with quantum yields of 0.11 and 0.09, respectively, at room temperature in THF solution. Initial investigations show that the tmeda-PPETE selectively detects some metal cations by an observed increase in fluoresence. In particular, Hg2+ in aqueous solution causes the fluorescence of tmeda-PPETE to increase by a factor of 2.7 at less than micromolar concentrations. The photophysical results are consistent with a PET mechanism for fluorescence quenching, which is removed upon binding of the analyte.
1,2,3-Triazolyl functionalized thiophene, carbazole and fluorene based A-: Alt -B type π-conjugated copolymers for the sensitive and selective detection of aqueous and vapor phase nitroaromatics (NACs)
Giri, Dipanjan,Patra, Sanjib K.
supporting information, p. 14469 - 14480 (2020/11/09)
A series of highly emissive π-conjugated A-alt-B type copolymers (P1-P3) appended with a 1,2,3-triazole moiety was synthesized via Suzuki polymerization. The well-defined and soluble π-conjugated copolymers were characterized via multinuclear NMR spectroscopy and tetradetector GPC studies, showing a molecular weight (Mn) in the range of 16.4-20.1 kDa with a polydispersity index in the range of 1.25-1.42. The synthesized emissive π-conjugated polymer probes were explored as fluorescent chemosensors for nitroaromatic compounds (NACs) in solution, vapor and contact mode. Detailed photophysical and sensing studies were performed to understand the polymer-NAC interaction, inducing the selective fluorescence quenching of the π-conjugated polymer probes through the photoinduced electron transfer (PET) mechanism. All the polymeric probes (P1-P3) were highly reversible in nature with NACs, and thus could be reused multiple times. The limit of detection of the probes towards nitroaromatics was found to be in the range of 120-200 ppb with a high association constant in the order of 104 M-1. Furthermore, test paper kits were also fabricated, which allowed the trace detection of picric acid by the naked eye, making it a practical means for the quick, easy and inexpensive on-site detection of NAC-based explosives.
NOVEL NON-CODING HETEROCYCLIC AMINO ACIDS (NCHAA) AND THEIR USE AS HERBICIDES
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, (2020/12/30)
The invention relates to a novel substituted amino acids, agricultural compositions comprising the novel substituted amino acids, and their use for controlling undesired plant growth alone or in combination with crop protection agents such as pesticides or plant growth regulators.
