- Rapid release from near-infrared polymer loaded liposomes for photothermal and chemo-combined therapy
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PEGylated liposomal doxorubicin is a polymeric antitumor drug approved clinically by the Food and Drug Administration, but it has no essentially increasing efficacy compared to free doxorubicin (DOX) because of the slow release rate. In this paper, a near-infrared polymer was designed and encapsulated in liposomes to photothermally accelerate the release of DOX. This polymer loaded liposome provides a maximum absorption that covers the ideal phototherapeutic window between 800 and 850 nm, which ensures an efficient photothermal release of DOX as a nano drug for the delivery of photothermal and chemo-combined therapy in a highly efficient cancer treatment.
- Li, Dehua,Zhang, Meiduo,Yao, Jingke,Zhang, Zhe
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Read Online
- Importance of solubilizing group and backbone planarity in low band gap polymers for high performance ambipolar field-effect transistors
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We investigated the performance of ambipolar field-effect transistors based on a series of alternating low band gap polymers of oligothiophene and diketopyrrolopyrrole (DPP). The polymers contain oligothiophene units of terthiophene [T3] and thiophenethienothiophene-thiophene [T2TT] and DPP units carrying branched alkyl chains of 2-hexyldecyl [HD] or 2-octyldodecyl [OD]. The structural variation allows us to do a systematic study on the relationship between the interchain stacking/ordering of semiconducting polymers and their resulting device performance. On the basis of synchrotron X-ray diffraction and atomic force microscopy measurements on polymer films, we found that longer branched alkyl side chains, i.e., OD, and longer and more planar oligothiophene, i.e., T2TT, generate the more crystalline structures. Upon thermal annealing, the crystallinity of the polymers was largely improved, and polymers containing a longer branched alkyl chain responded faster because longer alkyl chains have larger cohesive forces than shorter chains. For all the polymers, excellent ambipolar behavior was observed with a maximum hole and electron mobility of 2.2 and 0.2 cm2 V-1 ss, respectively.
- Lee, Joong Suk,Son, Seon Kyoung,Song, Sanghoon,Kim, Hyunjung,Lee, Dong Ryoul,Kim, Kyungkon,Ko, Min Jae,Choi, Dong Hoon,Kim, Bong Soo,Cho, Jeong Ho
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Read Online
- Two-acceptor one-donor random terpolymers comprising thiophene- and phenyl-capped diketopyrrolopyrrole for organic photovoltaics
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A series of random terpolymers comprising two electron deficient phenyl (PDPP) and thiophene (ThDPP)-capped diketopyrrolopyrrole (DPP) in conjugation with the electron-donating thiophene moiety are synthesised using Stille coupling. Their optical properties, energy levels, hole mobility, crystallinity and solar cell device performance can be systematically fine-tuned by controlling the molar ratio between ThDPP/PDPP (30/70, 50/50, 70/30, and 90/10) contents in the polymer backbone. Herein, we find that the crystalline properties and hole mobility of the terpolymer are enhanced by increasing ThDPP content in the polymer backbone. However, increasing PDPP content leads to low hole mobility and weak crystalline features. These characteristic features afford remarkable effect on the solar cell device performance. Bulk heterojunction (BHJ) solar cells are constructed by using these random terpolymers as donor materials and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as the acceptor. The best device performances are obtained for polymer P5T5P with the ThDPP/PDPP ratio of 50/50 and power conversion efficiency (PCE) of 2.9% due to balanced charge carrier mobility and optimized crystallinity in addition to good miscibility and favorable surface morphology with the fullerene acceptor. This study demonstrates that improved control of the crystallinity of the polymer donor through structural engineering can greatly help in improving device performance.
- Sambathkumar,Varathan,Subramanian,Somanathan
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p. 20113 - 20122
(2018/12/13)
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- NOVEL COMPOUND AND PHOTOELECTRIC CONVERSION DEVICE HAVING THE SAME
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The present specification of the photoelectric conversion element is the life, efficiency, electrochemical stability and thermal stability can be compound, said compound number. under public affairs including photoelectric conversion element. Specifically photoelectric conversion region of. under public affairs number organic solar cell. (by machine translation)
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Paragraph 0197-0199; 0212-0215
(2017/04/21)
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- The unusual electronic structure of ambipolar dicyanovinyl-substituted diketopyrrolopyrrole derivatives
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We have synthesized two novel dicyanovinylene-substituted DPP-oligothiophene semiconductors, DPP-4T-2DCV and 2DPP-6T-2DCV. In these materials, the combination of an extended oligothiophene conjugated skeleton with the strong electron-withdrawing DPP-dicya
- Riano,Mayorga Burrezo,Mancheno,Timalsina,Smith,Facchetti,Marks,Lopez Navarrete,Segura,Casado,Ponce Ortiz
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supporting information
p. 6376 - 6386
(2014/08/05)
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- Synthesis of diketopyrrolopyrrole (DPP) derivatives comprising bithiophene moieties
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Herein we disclose an easily applicable method for the synthesis of diketopyrrolopyrrole (DPP) derivatives comprising bithiophene moieties, with different substituents on the nitrogen atoms (Me, n-octyl, 3,5-di-tert-butylbenzyl, Boc) and on the thiophene rings (C6H13, C12H25), in good yields and purities. A comparison is made between the previously described method from literature and our more efficient approach regarding number of steps, overall yields and ease of synthesis and purification.
- Stas, Sara,Sergeyev, Sergey,Geerts, Yves
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supporting information; experimental part
p. 1837 - 1845
(2010/04/06)
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- DIKETOPYRROLOPYRROLE POLYMERS AS ORGANIC SEMICONDUCTORS
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The present invention relates to polymers comprising a repeating unit of the formula (l) and their use as organic semiconductor in organic devices, especially a diode, an organic field effect transistor and/or a solar cell, or a device containing a diode and/or an organic field effect transistor, and/or a solar cell. The polymers according to the invention have excellent solubility in organic solvents and excellent film-forming properties. In addition, high efficiency of energy conversion, excellent field-effect mobility, good on/off current ratios and/or excellent stability can be observed, when the polymers according to the invention are used in semiconductor devices or organic photovoltaic (PV) devices (solar cells).
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Page/Page column 45-46
(2008/06/13)
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