C_(60)与高聚物复合膜的光电导性能(英文)

在 ITO导电玻璃上制备了聚乙烯基咔唑（ PVK） \C_(60)复合膜与分散红 I(PDRO)\C_(60)复合膜。 在 250W的红外灯照射下,发现 PDRO\C_(60)复合膜的光电导性能明显优于 PVK\C_(60)复合膜,并对 该现象作了初步解释。     

C60-PMMA复合膜的纳米结构研究

采用化学有机沉积法，在Si(100)、KBr压片及微栅衬底上分别制备了C60／PMMA重量比不同的C60－PMMA复合膜、红外光谱分析表明，C60分子已均匀地分布在C60－PMMA复合膜中，利用X射线衍射（XRD）谱和透射电子显微镜（TEM）研究了该复合膜的结构，结果显示原来均匀分布在PMMA中的C60分子经过扩散趋向于形成非晶或晶化的C60颗粒，经过退火，以面心立方结构单晶形式存在的C60颗粒的尺寸为30－100nm，且以规则的几何形体分散在PMMA连续相中，玻耳兹曼能量分布规律能够较好地解释，提高C60含量或退火温度，晶化C60颗粒尺寸增大的现象。     

聚苯乙烯/富勒烯复合材料抗紫外老化性能

运用紫外加速老化熔融共混法制得C60和C70含量（质量分数）分别为1%、3%、5%的聚苯乙烯（PS）/C60和PS/C70复合膜,考察了复合膜的抗紫外线老化性能。利用红外光谱（FTIR）分析了聚苯乙烯的老化前后结构变化,用示差扫描量热法（DSC）和差热法（DTA）测试了各试样老化前后的玻璃化转变温度、分解温度,结果表明,加入C60和C70后,PS/C60和PS/C70复合材料的耐紫外老化性能大大提高,添加量为5%时复合材料的抗老化性能较好。     

富勒烯（C60）与类金刚石碳复合膜的Debye模型的模拟计算

由C60和类金刚石碳膜（DLC）组成的多层复合膜可在Si、玻璃和其它衬底上通过真空升华沉积和随后以CH4和H2作为反应剂用射频化学气相沉积（RFCVD）的方法制备,这种膜的若干特征可由拉曼谱（Raman)表征。复合膜电阻与介电常数由低频（LF）阻抗分析仪进行研究从而得到膜电阻、介电常数和频率间的关系。这些结果表明：在各种频率下的此类复合膜的电阻怀纯C60膜基本一致。但是纯C60膜随频率变化的电容率与复合膜明显不同,这些现象与结果可通过电介质的德拜模型和介质松弛理论进行分析与讨论。根据相应的Debye模型方程式,实验测得的介电常数和频率间的关系经计算机拟合,得到了复合膜的松弛时间,介电常数等。拟合结果基本上与实验数据一致。     

富勒烯(C_(60))与类金刚石碳复合膜的Debye模型的模拟计算(英文)

由 C_(60)和类金刚石碳膜（ DLC）组成的多层复合膜可在 Si、 玻璃和其它衬底上通过真空升华 沉积和随后以 CH4和 H2作为反应剂用射频化学气相沉积（ RFCVD） 的方法制备。这种膜的若干 特征可由拉曼谱（ Raman）表征。复合膜电阻与介电常数由低频（ LF）阻抗分析仪进行研究从而得 到膜电阻、介电常数和频率间的关系。这些结果表明：在各种频率下的此类复合膜的电阻与纯 C_(60) 膜基本一致,但是纯 C_(60)膜随频率变化的电容率与复合膜明显不同。这些现象与结果可通过电 介质的德拜模型和介质松弛理论进行分析与讨论。根据相应的 Debye模型方程式,实验测得的 介电常数和频率间的关系经计算机拟合,得到了复合膜的松弛时间,介电常数等。拟合结果基本 上与实验数据一致。     

乙基纤维素/C60复合膜制备及气体分离性能研究

为制备C60含量不同的乙基纤维素(EC)/C60复合膜,采用UV-可见光谱、AFM和XRD等手段对紫外光辐照前后复合膜结构进行表征,并考察其对气体分离及渗透性能的影响.结果表明,复合膜经紫外光辐照后,C60在膜表面的分布由独立的簇状结构转变为连续平缓的丘陵状结构,膜表面更加致密光滑;复合膜分子链间距未发生明显变化,但对N2、CO2、H2的渗透性能和H2/N2、CO2/N2分离性能产生明显影响.当C60添加量达到1.6%时,未经紫外光辐照的复合膜对CO2及H2的透气系数较纯EC膜分别提高了30%和40%,分别达到61.29Barrer和78.88Barrer,对H2/N2,CO2/N2理想分离系数增至纯EC膜的1.47和1.38倍,分别达到9.979和12.84;经紫外光辐照后,高C60含量的EC/C60复合膜能够保持纯EC膜对CO2和H2的透过水平,而对H2/N2和CO2/N2的分离性能增至纯EC膜的2.30和2.43倍,分别达到17.49和25.60.     

TiC/i-C复合硬质膜的过渡层界面和特性的研究(英文)

探讨在 i－ C（离子辅助沉积）硬质无定形碳膜和钢基基片之间加入碳化钛（ TiC）过渡层,以 增加膜 /基附着力和结合强度的各种优越性。 SEM（扫描电镜）和 EPMA（电子探针微分析）测试显 示 TiC中间过渡层与 i－ C层及基片的界面处的附着结合强度得以改善。划痕测试仪对该复合膜 测试则从另一方面提供了膜 /基结合强度提高的证据。对该复合膜的宏观机械力学性能的测试表 明,它在提高了膜 /基结合强度的同时,保持了类金刚石薄膜超高硬度和低摩擦系数的优良特性。     

分心木碳点/聚乙烯醇复合膜的制备及其在草莓保鲜的应用

目的 制备不同浓度碳点的未掺杂分心木碳点（1-CDs）/聚乙烯醇复合膜和氮掺杂分心木碳点（2-CDs）/聚乙烯醇复合膜,以延长草莓的货架期。方法 采用流延法制备复合膜,探讨不同浓度CDs对复合膜的光致发光行为、疏水性、力学性能、紫外吸收性能和阻隔性能的影响,并比较不同薄膜对草莓的保鲜效果。结果 碳点和聚乙烯醇分子内或分子间发生了较强的相互作用,碳点的加入增强了复合膜的疏水性和紫外吸收性能,2-CDs/PVA-6复合膜在60s时的接触角为65.3°,断裂伸长率和拉伸强度分别为(220.6±6.3)%、(107.55±4.9)MPa,2-CDs/PVA-6复合膜在波长300 nm时的紫外可见光透过率接近0,该复合膜对草莓的保鲜效果最好。结论 作为包装材料,2-CDs/PVA-6复合膜表现出潜在的应用价值,能够延长草莓的货架期。     

TiC/i-C复合硬质薄膜的制备和摩擦学行为的研究(英文)

介绍一种 TiC/i－ C双层复合硬质薄膜,该复合膜由碳化钛（ TiC）膜层和 i－ C（离子辅助沉 积）无定形硬质碳膜组成。采用反应磁控溅射的方法沉积碳化钛（ TiC）膜层。随后在维持镀膜系 统真空度的情况下,利用等离子体分解结合高能离子轰击的方法不间断地连续制备 i－ C类金刚 石薄膜。 TiC膜层对金属基片和表面 i－ C膜层都有良好的附着与结合强度, 因此被用作中间过 渡层,而表面 i－ C膜层则保持了 DLC薄膜硬度高和摩擦系数小等优良的性能。对 TiC/i－ C复 合膜的机械性能和摩擦学行为的测试显示该复合膜具有非常高的显微硬度及优良的摩擦学特性, 诸如很高的抗附着磨损、磨耗磨损、划痕磨损的性能及很低的摩擦系数。与 TiC单层膜与 DLC单 层膜比较,显示该 TiC/i－ C复合膜更能适合实际应用的需要,在国民经济中将有广阔的应用前景。     

氧化石墨烯-氨基酰化酶/聚偏氟乙烯复合膜的制备及特性

通过静电吸附法成功制备了氧化石墨烯-氨基酰化酶（GO-acylase）颗粒。将GO和GO-acylase颗粒分别添加到聚偏氟乙烯（PVDF）铸膜液中,通过相转化法制备了GO/PVDF和GO-acylase/PVDF复合膜。结果显示,GO-acylase/PVDF复合膜的粗糙度最低（R_a=8.21 nm）,表面最平滑。GO/PVDF和GO-acylase/PVDF复合膜的接触角较小（73.72°和71.31°）,说明复合膜的亲水性优于纯PVDF膜。由于GO的添加会增强溶质和非溶质之间的转化过程,从而导致GO/PVDF复合膜的纯水通量最大（69.0 L/（m2 h））。经过测定,GO-acylase/PVDF复合膜的生物活性在4℃下可以持续4周左右。研究结果表明,GO-acylase/PVDF复合膜的成功制备为抗生物污染膜的研发提供了新思路。      

C60/PVK/CdS纳米粒子功能复合 LB 膜研究

目的 尝试用Ｌａｎｇｍｕｉｒ－Ｂｌｏｄｇｅｔｔ（ＬＢ）技术组装Ｃ６０技术组装Ｃ６０功能复合体系的新方法。方法 采用（ＬＢ）技术制备Ｃ６０／ＰＶＫ／ＣｄＳ花生酸混合ＬＢ膜并利用界面化学反应技术将混合膜与硫化氢气体反应制得Ｃ６０／ＰＶＫ／ＣｄＳ纳米粒子功能复合ＬＢ膜并进行紫外光谱表征。结果 含不同比例Ｃ６０的Ｃ６０ＰＶＫ／ＡＡ体系可以在辐亚相上形成稳定的单层膜并转移到固体基片上得到了ＬＢ多层膜,ＬＢ混     

Synthesis and characterization of photoconductive C60–N-vinylcarbazole copolymers

Soluble C60–N-vinylcarbazole copolymers with different C60 contents were synthesized in lithium naphthalene-initiated anionic polymerization reactions. 13C nuclear magnetic resonance (NMR) results provided strong evidence for the covalent attachment of poly(N-vinylcarbazole; PVK) units to the C60 cores. The chemical shifts located at 142.16, 143.21, 144.70, 145.61, 146.65, 147.09, 149.08 and 170.28 p.p.m. in the 13C NMR spectrum of the copolymer are assigned to the unsaturated carbon signals of the substituted C60 cage. Its ultraviolet–visible absorption spectrum tends to move to the longer wavelength compared with those of the N-vinylcarbazole (NVC) monomer and PVK, and the peak range also extended from about 350 to 640 nm due to charge-transfer interaction between C60 and N-ethylcarbazole units. X-ray diffraction evidence suggests that the structure of the resultant copolymer might be a layered structure. Like the C60 chemically modified PVK, this material also exhibits good photoconductivity and temperature sensitivity. An unusual temperature dependence of the ESR spectrum is observed. In addition, it is also found that both [60] fullerene polyanion salts [(Cn-60) M+n, M=Li, Na, K] and fullerene itself are unable to initiate the polymerization of such monomers as N-vinylcarbazole, styrene and acrylonitrile, etc. © 1998 Kluwer Academic Publishers     

Enhanced resonance energy transfer from PVK to MEH-PPV in nanoparticles

Organic semiconductor nanoparticles were prepared from poly(N-vinylcarbazole) (PVK), poly(2-methoxy-5-(2(')-ethyl-hexyloxy)-p-phenylene vinylene) (MEH-PPV) and their blend solution via a reprecipitation method, respectively. A wide photoluminescence band centred at 430?nm has been found in the PVK nanoparticles, which is obviously red-shifted by comparison with the PVK film. The red-shifted emission from the PVK nanoparticles has a good spectral superposition with the absorption of the MEH-PPV nanoparticles. However, the spectral superposition is very poor between the two polymers in the composite films. The markedly enhanced emission from MEH-PPV is experimentally observed in the composite polymer nanoparticles and attributed to F?rster energy transfer from PVK to MEH-PPV for excitation at the absorption maximum of PVK.     

Photoconductivity and Doping Effect by NdPc of Polyvinylcarbazole (PVK)

The photoconductivity of dual layer photoreceptors was studied, where the charge-generation layer was polyvinylcarbazole (PVK), and the charge- transportation layers were triphenylamine (TPA) and 2,4,7-trinitrofluorenone (TNF), respectively. Both systems showed high photosensitivity in the visible region, the PVK-TPA system having higher photoconductivity. Meanwhile, the photosensitivity in the two systems was improved by adding dopant neodymium phthalocyanine (NdPc) into PVK, and both systems reached the best sensitivity as the conten t of NdPc in PVK was 0.5% (wt.).     

Characterization and magnetic properties of conducting poly(N-vinylcarbazole)-capped magnetite nanocomposite Langmuir-Schaefer films

Functionalized poly(N-vinylcarbazole) (PVK) has been synthesized by an oxidative polymerization with capped magnetite nanoparticles (CMPs, 10, 20, and 30%) for the preparation of conducting polymer composites that possess both electrical and magnetic properties. Spectroscopic studies reveal the successful functionalization of the nanoparticles into the PVK matrix. I-V characteristics of the composite films show an increase in the conductivity of the PVK film due to the presence of CMPs. The magnetization data exhibit an appreciable hysteresis loop at room temperature. The composite samples reveal an ordered semi-conducting behavior.     

掺氮类金刚石薄膜激光退火的Raman光谱分析

采用显微拉曼光谱研究的掺氮的类金刚石薄膜,该薄膜分别经过能量密度为300,750和1500W/mm^2氩离子激光的退火处理。分析结果表明氮原子在类金刚石薄膜中形成了C-N键制约了C-H键的形成。由于C-N键的键能比C-H键的键能大得多。因此在激光退火过程中C-N键不易分解,所以随着氮含量的增加,类金刚石薄膜的激光退火后石墨化程度明显降低,具有比较好的热稳定性,而非掺氮的类金刚石薄膜由于C-H键含量比较高,因此激光退火后容易石墨化。     

掺氮类金刚石薄膜的微观结构和电导特性

用射频等离子体化学气相沉积法（RFCVD）和CH4、N2与Ar组成的混合气体制备掺氮类金刚石薄膜（a-C:H:N)。用原子力显微镜（AFM）,俄歇电子能谱（AES）,红外光谱（IR）以及显微拉曼谱（Micro-Raman)对a-C:H:N薄膜的表面形貌、组分和微观结构进行了表征。实验结果表明,薄膜中有纳米量级的颗粒存在,而且随反应气体中N2与CH4比值的增大,薄膜中氮元素的含量也随之增大,并主要以C-N键和N-H键形式存在,少量以C≡N键形式存在,还研究了热退火对a-C:H:N薄膜的电导率的影响。     

Photoluminescence and photoconductivity studies of oriented polyfluorene thin films

Photoluminescence and photoconductive properties of poly(9,9-dioctylfluorene) (F8) on rubbed polyimide (PI) alignment layers have been studied. The F8 thin films are highly oriented, which is manifested from polarized absorption, fluorescence, and photoconductivity spectra (the order parameter of F8 is 0.86). The ratio of photocurrent parallel to perpendicular directions to the rubbing direction (photoconductivity anisotropy) is 18 at 2.9 eV for F8. Effects of C₆₀ addition to F8 on the optical properties are also studied. C₆₀ addition to F8 significantly increases photoconductivity but decreases the order parameter (0.67) and the photoconductivity anisotropy (7 at 2.9 eV). Both F8 and C₆₀ doped F8 thin films exhibit similar photoconductive response and similar photoconductivity anisotropy (3-4) above 3.8 eV.     

Growth and characterization of vacuum-deposited polyvinylcarbazole (PVK) films

The optical and infrared absorption spectra of polyvinylcarbazole (PVK) films deposited by vacuum evaporation show identical shape when compared with the corresponding spectra of solution-grown PVK films obtained by thermal evaporation of the solution of PVK and dichloromethane. This confirms the formation of PVK films on vacuum deposition. Electron spectroscopy for chemical analysis measurements indicate the presence of carbon and nitrogen in these films as expected from the structure of PVK. The scanning electron micrographs indicate that the surface of these vacuum-deposited films are quite smooth and remain so even after annealing them in the atmosphere at 373 K for 1 h.