Detection of oxygen species generated of C70-Ag2Se heterojunction photocatalysts with excellent visible light driven photocatalytic performance

Reactive oxygen species (ROS) can be produced by interactions between sunlight and light-absorbing substance in natural water environment and can completely destroy various organic pollutants in wastewaters. In this study, a novel Ag₂Se-C₇₀ heterojunction photocatalysts were successfully prepared. Surface area and pore volumes of the Ag₂Se-C₇₀ samples showed decrease due to deposition of Ag₂Se. The generations of ROS were detected through the oxidation reaction from DPCI to DPCO. The photocurrent density and the PGO effect increase in the case with the modified C₇₀. The PGO effect of the C₇₀ modified with Ag₂Se composites is increased significantly due to the synergetic effect between the C₇₀ and the Ag₂Se nanoparticles.     

球碳钕系催化丁二烯-异戊二烯共聚物的红外光谱测定

红外光谱法（ＦＴ ＩＲ）测定了（Ｃ６０Ｘ）载体钕系催化剂引发不同丁二烯 异戊二烯摩尔比所得共聚物的组成变化规律,提出了球碳９７３ｃｍ－１吸收带可能与共聚物主链上双键与Ｃ６０分子骨架间存在π π相互作用有关的解释。     

Normal-state transport properties of fullerene superconductors

The normal-state transport properties of alkali-metal-doped fullerene crystals are explored. The Hall effect has been measured in K_xC₆₀ from room temperature toT _c . The electrical resistivity for K₃C₆₀ and Rb₃C₆₀ has been measured over a wide temperature range (20–650 K), and notable differences are observed for the materials at both low and high temperatures. The electrical resistivity of Rb₃C₆₀ has been measured in hydrostatic pressures up to 9 kbar. The resistivity is highly pressure sensitive. The transport results give an insight into the normal-state conduction mechanism and thus have consequences for the superconductivity mechanism.     

Electrochemical quartz crystal microbalance studies of thin-solid films of higher fullerenes: C76, C78 and C84

Thin-solid films of higher fullerenes, viz. C₇₆, C₇₈ and C₈₄, were prepared by the drop coating technique and characterized by simultaneous cyclic voltammetry and piezoelectric microgravimetry with the use of an electrochemical quartz crystal microbalance. Properties of the films were compared with those reported earlier for the C₆₀ and C₇₀ thin-solid films. The effect of nature of the counter cation on electrochemical properties of the films has been probed by employing acetonitrile solutions of two different 0.1 M supporting electrolytes, namely tetra(n-butyl)ammonium (TBA⁺) hexafluorophosphate and potassium hexafluorophosphate. Stability of the films with respect to dissolution depends on the fullerene oxidation state as well as on the nature of both the fullerene in the film and the counter cation in the supporting electrolyte. The TBA⁺ counter cation ingress to the film for compensation of the negative charge of the reduced fullerene is accompanied by the acetonitrile solvent intake. The number of acetonitrile molecules per TBA⁺ counter cation entering the film is higher the higher the fullerene. Also, the Langmuir films of higher fullerenes were prepared at the air-water interface and the film morphology was characterized by the Brewster angle microscopy.     

Synthesis and photoconducting properties of C60‐bonded polystyrene initiated with C60Cln

C₆₀‐bonded polystyrene was produced with a novel initiator system, C₆₀Cl_n/CuCl/2,2′‐bipyridine (where the average value of n is 20). The molar ratio of styrene/C₆₀Cl_n/CuCl/bpy was 100:1/20:1:2, and the polymerization temperature was 130°C. Gel permeation chromatography detected with an ultraviolet detector demonstrated that C₆₀ was chemically bonded to polystyrene. The linear increase in the number‐average molecular weight (by gel permeation chromatography) with the conversion indicated that this novel initiator system had some characteristics of living polymerization. A possible polymerization mechanism was examined. The photoconducting properties of C₆₀‐bonded polystyrene were better than those of polystyrene initiated with CCl₄. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3001–3004, 2002     

Relative Stabilities of C74 Isomers

Relative stabilities of six C₇₄ fullerene cages are evaluated: one species obeying the isolated pentagon rule (IPR), three isomers with a pentagon-pentagon junction, two structures with one pentagon-pentagon pair and one heptagon. The computations are carried out using the Gibbs energy in a broad temperature interval. It is shown that the IPR cage (D_3h symmetry) prevails throughout. As low-lying electronic excited states are possible for the cages, their electronic partition functions are included into consideration. It is argued that for the special conditions of the fullerene synthesis/isolation, the electronic partition function based on the singlet excited states only should better reproduce the experimental population findings. The computations indicate that isolation of other C₇₄ cage, in addition to the IPR isomer, is less likely though not impossible.     

Conjugated polymers with tethered electron‐accepting moieties as ambipolar materials for photovoltaics

Conjugated polymers are of increasing interest as semiconductors for soft (opto)electronic devices, including photovoltaic elements. A promising conversion of solar energy into electrical energy is possible with blends of soluble electron donor‐type conjugated polymers and fullerenes as electron‐acceptor, transporting component. This approach, called bulk‐heterojunction, suggested the preparation of intrinsic ambipolar materials to control simultaneously the electronic and morphological properties. On these bases, the covalent grafting of acceptor moieties onto conjugated backbones seemed attractive for the preparation of intrinsically ambipolar polymeric materials (‘double‐cable’ polymers) as an alternative to donor–acceptor composites. The design, characterisation and application of this novel class of polymers are reviewed taking into account the current understanding of organic photovoltaics. Copyright © 2007 Society of Chemical Industry     

由脱灰煤制备富勒烯

以 3种高变质程度的中国煤为原料 ,用电弧等离子体蒸发法制备富勒烯 .富勒烯产品的表征采用质谱、紫外光谱和红外光谱等技术 .采用碱法脱灰技术对 3种煤进行脱灰处理 ,考察了脱灰前后煤样的灰分和相应炭棒中碳含量对富勒烯产率的影响 .结果表明 ,由实验所用煤种均可制得富勒烯 .原料煤本身的化学结构和组成对富勒烯的产率有明显影响 ,表现为富勒烯的产率随炭棒中碳含量的增加而增大 .煤中的矿物质对富勒烯的形成有很强的抑制作用 ,表现为富勒烯的产率随原料煤中灰分的增加而降低 ,这一变化趋势通过对介休焦煤进行不同程度的脱灰处理而得到进一步证实.     

微波等离子体法合成洋葱状富勒烯的研究

在微波等离子体条件下, 以乙炔炭黑/二茂铁为原料, 低温合成纳米洋葱状富勒烯(Nano-structured Onion-like Fullerenes: NSOFs). 采用HRTEM、Raman和XRD等分析方法对产物的形貌、尺寸、微观结构及其物相结构进行了表征. 结果表明, 以乙炔炭黑/二茂铁为原料可大量合成NSOFs, 其外观呈准球状或多面体状、实心、直径分布均匀, 最外碳层由闭合的、呈波浪状的石墨片构成.