SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Wanchuan Ding,Ge Zhang,Hui Zhang,Jingkun Xu,Yangping Wen,Jie Zhang
Poly(9-fluorenecarboxylic acid) (PFCA) thin film was successfully fabricated onto the surface of indium tin oxide glass by one-step electropolymerization of commercially available 9-fluorenecarboxylic acid in boron trifluoride diethyl etherate. Meanwhile, PFCA thin film could specifically recognize Fe 3+ . Fe 3+ was generated by the oxidization of Fe 2+ in the presence of H 2 O 2 that was produced by biochemical reactions and resulted in fluorescence quenching of PFCA thin film. Furthermore, a sensing platform was designed for highly selective fluorescent detection of glucose. The qualitative and quantitative analysis of Fe 3+ , H 2 O 2 and glucose with detection limits of 1 μM, 2.9 μM and 3.4 μM respectively could be implemented by a simple, cost-effective, reusable, practical and multi-functional PFCA thin film. The fabricated PFCA-based chemo/bio sensing film for fluorescent detection of Fe 3+ in rice sample or glucose in serum sample was assessed. Satisfactory results indicate that this work will provide not only a new strategy for fluorescent detection of important substances in agricultural science, but also significant theoretical guidance and important reference value for the practical application and development of multi-functional sensing device.
研究领域:
分析化学
·
生物传感
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 52
·30398-30405
·
IF 3.049
Yanting Wu,Zewu Xiao,Lihong He,Xiaoli Yang,Yajun Lian,Guoqing Li,Xiaohui Yang
In this paper, a cross-linked poly(9-vinylcarbazole) (PVK):phosphomolybdic acid (PMA) layer is used as the hole transport layer in perovskite light-emitting devices, and the morphology, crystal structure, and photophysical properties of perovskite films on the PVK:PMA layer are studied. The addition of PMA into the PVK layer improves the perovskite morphology integrity and promotes hole transport. As a result, perovskite light-emitting devices using a PVK:PMA hole transport layer exhibit an improved maximum luminous efficiency of 22.1 cd A−1 and power efficiency of 18.2 lm W−1 when compared with those of the counterparts with a PVK hole transport layer. Efficient perovskite light-emitting devices can be accessed by using various antisolvents due to the good solvent resistance of PVK:PMA networks. Moreover, the luminous efficiencies of perovskite light-emitting devices with a PVK:PMA hole transport layer are almost invariant irrespective of the presence of a hole injection layer, illustrating wide applicability of the PVK:PMA hole transport layer in perovskite light-emitting devices.
研究领域:
材料科学
·
光电学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Di Li,Chuan Wang,Jiahui Hu,Wu Tang,Shan Jia,Meichen Guo,Cong Fan
A new organic polymer cathode namely poly(9,10-phenanthraquinone-alt-benzene) (PPQ, ∼190 mAh g −1 ) is designed and synthesized for sodium-ion batteries (SIBs). Adequate characterizations are carried out to define its polymer nature. In half cells, the discharge capacity of PPQ shows almost no attenuation, stably maintaining at 150 mAh g −1 during 300 cycles. In full cells, the PPQ II Na 3 Bi SIBs realize the stable discharge capacities of average 126 mAh g −1 cathode during 150 cycles (100 mA g −1 cathode ) and average 97 mAh g −1 cathode during 800 cycles (800 mA g −1 cathode ), along with the average discharge voltage of ∼ 1.5 V. To the best of our knowledge, the results of PPQ can represent the new advancement for organic polymer cathodes in SIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 37
·期 7
·664-673
·
IF 2.804
Liu Ya-Di,Zhang Qiang,Yu Xin-Hong,Liu Jian-Gang,Han Yan-Chun
For poly(9,9-dioctylfuorene) (PFO), β phase (coplanar conformation with the intra-chain torsion angle of 165°) has a greater conjugation length and higher degree of order compared to those of α phase, which favors charge carrier transport. However, the highest content of β phase obtained so far is 45%. We propose to increase the content of β phase by promoting the solution aggregation of PFO molecules and extending film-forming time. For this purpose, 1,8-diiodooctane (DIO) is added to PFO o -xylene solution, which enhances the interaction of PFO chains and improves the planarity of PFO backbone, resulting in the formation of ordered aggregation. The aggregates act as nucleation centers to promote the formation of β phase. The content of β phase increases with increasing DIO concentration and reaches a platform of 39% as DIO is more than 4 vol%. Furthermore, the film is kept in a sealed environment with o -xylene atmosphere for 3 h, thus the PFO molecules have enough time to diffuse to the crystallization front and achieve disorder-order transition. As a result, the crystallinity of PFO is improved significantly and the content of β phase increases to 52%, reaching the highest value reported so far.
研究领域:
高分子化学
·
材料科学
·
凝聚态物理
·
纳米技术
·
光电材料
·
有机电子学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jiankai Zhang,Wujian Mao,Jiaji Duan,Sumei Huang,Zhejuan Zhang,Wei Ou-Yang,Xuehua Zhang,Zhuo Sun,Xiaohong Chen
Poly(9-vinylcarbazole) (PVK) was introduced to modify the interface of perovskite/PCBM. The modified PVK material can induce the formation of the quasi-continuous sheet-shaped perovskite film at the surface of 3D perovskite layer, which may reduce the exposed grain boundaries. Besides, the PVK modified perovskite layer can reduce carrier recombination and accumulation at the interface of perovskite/PCBM and improve the crystallinity of perovskite layer and the interface contact properties. The PVK modification can greatly improve the PCEs and thermal and moisture stability and suppress the J-V hysteresis of perovskite solar cells (PSCs). PSCs with PVK modification achieved champion PCE of 19.03% (average PCE of 18.40%), maintained 80% of the original PCE value aging for 50 days under ambient conduction without encapsulation. Furthermore, PSCs with PVK modification can maintain 87% of the origin PCEs aging for 3 h under 85 °C thermal stress, which are greatly higher than that (26%) of PSCs without PVK modification.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2021
·
IF 3.721
Yanyan Wu,Fang Yuan,Feifei Fu,Chenxing Liu,Bo Jiao,Fanghui Zhang,Zhaoxin Wu
Since the emergence of organic-inorganic hybrid perovskites , the development of perovskite light-emitting diodes (PeLEDs) with green/red emission have made great progress, and the corresponding external quantum efficiency (EQE) has exceeded 20%. However, the research progress of blue-emitting PeLED still has certain challenges. In this article, a multi-cation per-bromine perovskite film is prepared by introducing polymer molecules poly(9-vinylcarbazole) (PVK) in an anti-solvent (chloroform). When the concentration of PVK is optimized to 0.1 mg/mL, a smooth, dense, high-quality film with photoluminescence quantum efficiency (PLQY) up to 20.70% is obtained. The introduction of PVK can assist the formation of perovskite films for interface modification via surface defect passivation . The optimized blue PeLED has a maximum brightness of 3136 cd/m 2 and a maximum EQE of 3.49% at 488 nm. More importantly, the optimized blue PeLED has excellent color stability under high applied voltage up to 12 V or continuous operation.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2022
·
IF 6.978
Sifan Ji,Min Lin,Zenghao Li,Lili Xu,Xiaohui Fu,Guosong Chen,Zhibo Li,Jing Sun
Aggregation-induced emission (AIE) luminogens with highly tunable properties show great potential for many applications. In this study, we synthesized a new family of AIE-type poly(ethylene glycol)-block-poly(9-anthrylmethyl lysine) (PEG-b-PLys-An) diblock copolymers by taking advantage of amphiphilic self-assembly and rigid helical backbones. These copolymers can self-assemble into various assemblies through nanoprecipitation methods. The micelles using N,N-dimethylformamide (DMF) as a cosolvent present brighter fluorescence than the vesicles prepared from tetrahydrofuran (THF). We demonstrate that the decreased solubility of copolymers in DMF results in the formation of more compact micelles with more excimer formation during the self-assembly process, while better solvent THF favors the formation of vesicles with stretched core chains. In addition, the secondary conformation of the polypeptide block shows pronounced effects on the fluorescence property. We further show the internalization of the assemblies using two types of cells by cellular uptake experiments. By the delicate design of the block copolymer, we successfully prepare the morphology- and conformation-dependent AIE materials for potential biomedical applications.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
·
细胞生物学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Liyan Yang,Yu Yan,Feilong Cai,Jinghai Li,Tao Wang
Conjugated polymer poly(9-vinylcarbazole) (PVK) has been explored as an efficient hole transport material (HTM) to replace poly(3,4-ethylenedio-xythiophene): poly(styrenesulfonate) (PEDOT:PSS) for the preparation of p-i-n type, inverted planar heterojunction perovskite solar cells. The PVK film can be facilely deposited by room-temperature solution-casting without any doping or post treatments. Using MAPbI 3 as the photoactive layer, a 15.8% stabilized power conversion efficiency was achieved in ITO/PVK/MAPbI 3 /PCBM/Ag devices, which is a significant improvement compared with 12.1% from devices using PEDOT:PSS as the HTM. The perovskite photoactive layer cast on PVK HTM has higher crystallinity and less PbI 2 residues, leading to a higher charge recombination resistance of the device. After a storage of 1000 h, the PCE of PVK- and PEDOT:PSS- based devices dropped to 82.5% and 56% respectively, and demonstrated that the PVK-based perovskite devices is more stable compared with the PEDOT:PSS-based devices.
研究领域:
材料科学
·
太阳能
·
有机电子
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2022
·Vol. 13
·期 23
·3506-3512
·
IF 5.364
Yuanzuo Zou,Dan Wang,Jingzhou Guo,Junwei Yang,Yuan Pu,Jian-Feng Chen
One of the most suitable methods for synthesizing conjugated polymers is the Suzuki cross-coupling reaction because of its high tolerance and stability. Herein, we report an improved strategy to synthesize conjugated polymers via Suzuki cross-coupling polymerization in a rotating packed bed (RPB) reactor. The synthesis of poly(9,9-dioctylfluorene) (PFO) was systematically investigated. The enhancement of mixing and mass transfer from the RPB ensured the uniformity of the contact probability of active functional groups and the consistency of the growth rate of molecular chains. Therefore, under the optimized experimental parameter of 2.0 mmol monomer equivalents, the polydispersity index (PDI) of the PFO synthesized in the RPB was maintained at about 2.0, which was much lower than that of the traditional synthesis method in stirred reactors. Further, the performance of polymer light-emitting diodes prepared using PFO with a low PDI was more stable.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2023
·Vol. 14
·期 11
·1275-1281
·
IF 4.6
Yuanzuo Zou,Jingzhou Guo,Yinglu Liu,Yudi Du,Yuan Pu,Dan Wang
Process intensification technologies based on novel reactors have been considered to be the most promising progress paths for developing more efficient chemical processes. In this work, the synthesis of poly(9,9-dioctylfluorene-alt-benzothiadiazole), abbreviated as F8BT, was achieved via Suzuki cross-coupling polymerization in a rotating packed bed (RPB) reactor maintained in an oxygen-free environment. The synthesized F8BT has a number average molecular weight of 35.2 kDa, a polymer dispersity index of 2.47 and double band absorption and yellow-green photoluminescence properties. An aqueous dispersion of F8BT nanoparticles was then prepared by solvent–antisolvent recrystallization in an external circulation RPB reactor, and spherical nanoparticles with an average particle size of 175.6 nm and a particle dispersion index within 0.2 were obtained. The nanoparticles, which appear yellowish green in color under 365 nm excitation, were uniformly incorporated into polyvinyl alcohol by virtue of the compatibility brought about by hydrogen bonding to obtain PVA composite films containing F8BT nanoparticles. The composite film has a shape memory function, and the irreversible shape change process from the initial “closure” to the final “blooming” is completed in about 15 min at an ambient temperature of 20 °C and 60% relative humidity. It is expected to be used as an optical functional device to monitor the cold chain.
研究领域:
材料科学
·
化学工程
·
光学器件
·
物流技术
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2020
·
IF 3.31
Min Yang,Qin Zhang,Wenjing Zhang,Zhongqi Hao,Yuancheng Qin,Xia Hai,Fangfang Li,Dan Zhou,Yubao Zhang
Improving the hole carrier mobility of organic hole-transporting materials is critical for the development of advanced quantum dot light-emitting diodes (QLEDs). Here, a simple method is reported for enhancing the hole-charge mobility in poly(9-vinylcarbazole), PVK. Doping of the PVK using the molecular Lewis acid tris(pentafluorophenyl)borane as a dopant is shown to have a powerful effect on the hole-charge mobility, and the performance of the QLEDs. By adjusting the amount of dopant, the p-type Hall mobility can be increased up to 3.3-fold, and thereby, the external quantum efficiency and current efficiency of QLEDs are improved by 132% and 249%, respectively.
研究领域:
材料科学
·
电气工程
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Han Zhang,Qiyi Lu,Fumei Zuo,Ruo Yuan,Shihong Chen
A novel “signal-on” biosensor for the detection of concanavalin A (Con A) was designed utilizing an enzymatic reaction to in situ generate coreactant of poly(9,9-di- n -octylfluorenyl-2,7-diyl) (PFO). Firstly, PFO polymers were wrapped with graphene oxide nanosheets to obtain GO@PFO nanocomposite, which was modified onto the surface of the electrode as a matrix for immobilizing phenoxy-derivatized dextran (Dexp) through π-π stacking interaction. Then Con A interacted with Dexp through the specific carbohydrate-protein interaction. Finally, glucose oxidase (GOx) and lactate oxidase (LOx) decorated gold nanoparticles@C 60 -Polyamidoamine (Au@C 60 -PAMAM) was bound onto Con A via a biospecific interaction between Con A and the internal residues of GOx, thus achieving a sandwich structure. In this construction strategy, LOx catalyzed the oxidation of lactate to in situ generate H 2 O 2 , which could act as the coreactant of PFO to enhance the ECL intensity. Due to the excellent ECL property of PFO–H 2 O 2 system, our prepared biosensor showed a wide linear range from 0.001 ng/mL to 10 ng/mL, and a low detection limit down to 0.0003 ng/mL. The integration of excellent ECL property of PFO–H 2 O 2 system and excellent catalytic activity of Au@C 60 -PAMAM would open a new and promising platform for fabricating ECL biosensors and biocatalysts.
研究领域:
分析化学
·
生物传感器
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）