封伟
个性化签名
- 姓名:封伟
- 目前身份:
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学术头衔:
博士生导师, 教育部“新世纪优秀人才支持计划”入选者
- 职称:-
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学科领域:
高分子化学
- 研究兴趣:
封伟,1992年,大学本科毕业于西安交通大学高分子材料专业,获学士学位。2000年获得西安交通大学物理电子与光电子专业工学博士学位。1999年-2000年,做为AIEJ博士研究生在日本大阪大学电子工学做博士课题研究。2001-2002年,在日本大阪大学电子系做博士后研究。2002-2004年,在清华大学做博士后研究。2007年入选日本JSPS高级访问学者。2004年至今,在天津大学材料学院任教授、博导。
曾作为项目负责人承担过国家自然科学基金5项、教育部重点项目1项、天津市基金2项、教育部博士点基金与留学回国基金各1项、中国博士后科学基金1项、日本大阪大学合作基金2项。至今已发表学术论文100余篇,被SCI收录论81篇(其中近5年发表49篇),其中IF影响因子大于3.0的共有33篇;被EI收录50余篇,在国际会议论文集上发表论文14篇,被ISTP收录8篇。2005年获得“清华大学优秀博士后奖”、“中国化学会第三届优秀论文奖”,2006年入选“教育部新世纪优秀人才支持计划”。2007年与2011年两次获得天津市自然科学奖二等奖(第一获奖人)。2009年获得第十届天津市青年科技奖。
主要从事有关光电功能材料与应用研究。提出了\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"原位吸附-受限增长\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"生长方法获得了高度定向的共轭聚合物-碳管纳米复合阵列,为未来纳米级光电子器件集成化提供了原创思路;提出了微观结构有序化的给体-受体共轭复合膜用于制作光伏器件的新思路,为提高有机光伏器件转换效率指明了方向。成果受到Nature、Mat Sci Eng R、Chem Commun等综述文章评论。论文被引用710次,其中他引585次,被综述引用59次。第1作者论文单篇被他人引用最高141次。
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1131
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成果数
17
封伟
,-0001,():
-1年11月30日
Flexible self-assembled membrane and hollow spheres (1.7–4.6 μm in diameter) accompanied with self-assembled membrane of poly(3,4- ethylenedioxythiophene) doped with acetic acid were synthesized in aqueous solution using ammonium persulfate as oxidant. Scanning electronic microscope imagines approved the flexible membrane and sphere-like morphologies and indicated a “grow from membrane” process. The mechanism of self-assemble phenomenonwas discussed by Fourier transform infrared and differential scanning calorimeter. Itwas found that self-assembly was driven by the hydrogen bond between 3,4-ethylenedioxythiophene monomers and acetic acid. The concentration of acetic acid plays an essential role in the self-assemble process. Moreover, the electrochemical properties of them with different morphologies were also characterized by cyclic voltammetry.
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封伟
,-0001,():
-1年11月30日
A new type of photo-responsive perylene diimide–azobenzene dyad (PDI–AZO) was synthesized by covalently adjoining azobenzene chromophore to N-imide position of perylene diimide. The optical properties, photoisomerization and self-assembly morphology of the resultant composites were characterized by UV–vis absorption, photoluminescence (PL) spectra and scanning electron microscope. Larger one-dimension nanobelts were observed in self-assembly PDI–AZO due to the strong molecule stacking. The red-shifted bands arise from the larger conjugation extension by p-electron overlap of perylene ring and azobenzene chromophore. The spectral changes upon the irradiation of ultraviolet light show that larger conjugation extension does not significantly affect the photochromism rate, but it retards the further photoisomerization of azobenzene units in PDI–AZO. The PL quenching of PDI–AZO is dominated by the transfer of the excitons before reverting to the ground state accompanied by the radiation due to the larger conjugation extension. 2007 Elsevier B.V. All rights reserved.
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封伟
,-0001,():
-1年11月30日
Multiwalled carbon nanotubes (MWCNTs) were grafted by chitosan (CS); the product could disperse well in poly(vinyl alcohol) (PVA) aqueous solution with 2% (v/v) acetic acid solution.Because this product has potential in several biological fields, it was electrospun so as to enlarge the surface area. Raman spectra indicated that the electrospinning process did not severely alter the electron hybridization of carbon atoms within the nanotube framework. Moreover and interestingly, these nanofibers showed a novel sheath–core structure; the outer and inner diameters of these sheath–core nanofibers were about 200 nm and 100 nm,respectively. These nanofibers’ electrochemical properties were characterized by detection of hydrogen peroxide and voltammetric responses of potassium ferricyanide. The electrospun fibers’ web displayed faster electron transfer kinetics and better electrochemical properties than its cast film, which justified further applications in biological areas.
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封伟
,-0001,():
-1年11月30日
Organic photovoltaic devices based on a blend of poly(3-hexylthiophene) and a fullerene have been studied by inserting oriented zinc oxide nanopillars which were fabricated by a new method at low temperature (343 K). The dependence of the photovoltaic performance on the zinc oxide morphology was investigated, and it is concluded that the oriented zinc oxide nanopillar array plays an important role in collecting photogenerated electrons and acts as a conducting path to the electrode. Insertion of the oriented zinc oxide nanopillars in the photovoltaic cells produced enhanced performance with a power conversion efficiency of 1.22% under AM1.5 illumination.
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【期刊论文】Room Temperature Purification of Few-Walled Carbon nanotubes with High Yield
封伟
,-0001,():
-1年11月30日
Purification of high-quality few-walled carbon nanotubes (fWNTs) was developed by slow but selective oxidation in hydrogen peroxide (H2O2) at room temperature. The purity, nanotubes’ structure, and thermal stability of purified fWNTs were characterized by transmission electron microscopy (TEM), Raman spectroscopy, and thermogravimetric analysis (TGA), respectively. The results showed that fWNTs could be selectively purified by prolonging the stirring time in 30 wt % H2O2 solution. Highly purified fWNTs were obtained,having a high G/D ratio in Raman spectra and good thermal stability indicating the good quality of the purified fWNTs. The approach provides a simple low cost method for purification that also has higher nanotube yield than other purification methods.
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封伟
,-0001,():
-1年11月30日
It is shown experimentally that the absorbance change observed in the ‘‘negative’’ time range, where probe pulse precedes pump pulse in real-time vibrational spectroscopy is induced only by the excited-state wave-packet motion as theoretically expected. Coherent molecular vibration of a polymer in the excited state was observed in the real-time trace without the effect of wave-packet motion in the ground state, which usually makes it difficult to ascribe the signal either to the ground state or to the excited state.
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封伟
,-0001,():
-1年11月30日
The real-time vibrational spectroscopy was utilized to obtain both electronic and vibrational dynamics in a conjugated polymer under the same excitation and probing condition by using the same sample and observing at the same time. Most of the conjugated polymers are in an amorphous phase, in which there is a relatively broad distribution of chain length, conjugation length, and degree of interaction strength between neighboring chains. Because of the varieties, a simultaneous measurement of electronic and vibrational dynamics in a broad spectral range is considered to be most powerful to study such systems as conjugated polymers. In the present paper, we performed this type of experiment of the simultaneous probing of electronic and vibrational relaxations at 128 wavelengths. The sample studied here is an amino-moiety-containing conjugated polymer, poly3-hexylthiophene-2,5-diyl-p-dimethylaminobenzylidenequinoidmethene PHTDMABQ, whose monomer is a derivative of a thiophene oligomer. The light source is a few-cycle pulse laser with an ultimate time resolution of 0.2 fs in the visible and near IR ranges. The data containing both electronic relaxation and vibrational dynamics were analyzed to obtain a more reliable relaxation mechanism of the excitations than a combination of individual studies of electronic and vibrational relaxations. By utilizing the ultrafast pumpprobe spectroscopic system, we could identify the exciton state with a -electron delocalized in benzilidene ring. In the polymer PHTDMABQ, the geometrical relaxation from the free exciton to the exciton polaron takes place in 60–100 fs. This time is close to that observed in several polydiacetylenes previously reported. The C-C single bond stretching frequencies of the free exciton and exciton polaron are about 1300 and 1350 cm−1. The coherent molecular vibration after the geometrical relaxation is considered to be a kind of reaction induced coherence. This coherent vibration decays with the time constant of about 450 fs.
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封伟, W.
JOURNAL OF APPLIED PHYSICS VOLUME 88, NUMBER 12, 15 DECEMBER 2000,-0001,():
-1年11月30日
The
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封伟, FENG
CHIN. PHYS. LETT. Vol. 20, No. 5 (2003),-0001,():
-1年11月30日
Covalent
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封伟, W.
Carbon 41 (2003) 1551-1557,-0001,():
-1年11月30日
tion between PANI and MWNTs and the nature of chain growth have been investigated and explained according to the results of FT-IR analysis. The improvement of thermal stability and crystallinity of the nanocomposites have been evaluated by using TGA and XRD. The mechanism of charge transport in these composites has also been studied by measuring the DC conductivity of all samples and examining the temperature–conductivity relations. MWNT alignment should be possible with other nanometer-sized building composites films, offering a general route for controlled assembly of organized nanomaterials and devices.
A.,
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