查找使用阿拉丁产品的科研文献

Pronounced interfacial interaction in icosahedral Au@C60 core-shell nanostructure for boosting direct plasmonic photocatalysis under alkaline condition

Yue Tian,Qingqiang Cui,Linlin Xu,Anxin Jiao,Shuang Li,Xuelin Wang,Ming Chen

The unique hot carrier-driven direct plasmonic photocatalysis of coinage metal nanomaterials (NMs) via energetic localized surface plasmon resonance (LSPR) in visible-light region has been explored in recent years. However, the low photoinduced electron transfer efficiency and insufficient separation of electron-hole pairs would severely preclude their widespread practical applications. Herein, we demonstrate an interesting plasmonic photocatalyst based on the construction of icosahedral (Ih) Au@C 60 core-shell NMs, taking advantage of specific delocalized π electrons structure of a tight C 60 shell and enhanced LSPR property of Ih Au core. Then, the pronounced interfacial interaction at junction region endows the obtained Au@C 60 NMs with an outstanding photoinduced hot carrier-transmission during photocatalytic reaction, facilitating a remarkably higher (1.89 times) photocatalytic activity toward visible-light driven degradation of crystal violet (CV) dyes, as compared to bare Au NMs. Impressively, the photocatalytic activity of Ih Au@C 60 NMs can be effectively optimized by changing the pH value of reaction solution, with the kinetic rate constant reaching the maximum value of 0.179 min −1 in pH 0 11.4 solution, while 0.005 min −1 at pH 0 3.0. Moreover, due to the protection of a tight C 60 shell, the Ih Au@C 60 NMs also possess excellent photocatalytic stability/reusability in recycling runs, holding great potential for the design of robust and high-performance plasmonic photocatalysts in repeated practical applications.

Synthesis and thermal performance study of C60-polyglycidyl nitrate (C60-PGN) maleic acid copolymer lead salts

Zuohu Chai,Bo Jin,Wenlin Gong,Rufang Peng,Shijin Chu

Cotransport of nanoplastics (NPs) with fullerene (C60) in saturated sand: Effect of NPs/C60 ratio and seawater salinity

Zhiqiang Dong,Wen Zhang,Yuping Qiu,Zhenglong Yang,Junliang Wang,Yidi Zhang

Nanoplastics (NPs) have been identified as newly emerging particulate contaminants . In marine environments, the interaction between NPs and other engineered nanoparticles remains unknown. This study investigated the cotransport of NPs with fullerene (C 60 ) in seawater-saturated columns packed with natural sand as affected by the mass concentration ratio of NPs/C 60 and the hydrochemical characteristics. In seawater with 35 practical salinity units (PSU), NPs could remarkably enhance C 60 dispersion with a NPs/C 60 ratio of 1. NPs behaved as a vehicle to facilitate C 60 transport by decreasing colloidal ζ-potential and forming stable primary heteroaggregates. As the NPs/C 60 ratio decreased to 1/3, NPs mobility was progressively restrained because of the formation of large secondary aggregates. When the ratio continuously decreased to 1/10, the stability and transport of colloids were governed by C 60 rather than NPs. Under this condition, the transport trend of binary suspensions was similar to that of single C 60 suspension, which was characterized by a ripening phenomenon. Seawater salinity is another key factor affecting the stability and associated transport of NPs and C 60 . In seawater with 3.5 PSU, NPs and C 60 (1:1) in binary suspension exhibited colloidal dispersion, which was driven by a high-energy barrier. Thus, the profiles of the cotransport and retention of NPs/C 60 resembled those of single NPs suspension. This work demonstrated that the cotransport of NPs/C 60 strongly depended on their mass concentration ratios and seawater salinity.

Synthesis of C60-decorated SWCNTs (C60-d-CNTs) and its TiO2-based nanocomposite with enhanced photocatalytic activity for hydrogen production

Bo Chai,Tianyou Peng,Xiaohu Zhang,Jing Mao,Kan Li,Xungao Zhang

A novel nanostructured carbon/TiO2 nanocomposite photocatalyst is firstly fabricated via a facile hydrothermal process by using fullerene (C60) decorated single-walled carbon nanotubes (SWCNTs) as carbon source, which is denoted as C60-d-CNTs. The obtained nanostructured carbon/TiO2 nanocomposites are characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), UV-vis diffuse reflectance spectra (DRS), Raman spectra, X-ray photoelectron spectroscopy (XPS) and photoluminescence spectra (PL), and then are used as catalysts for photocatalytic hydrogen production. It is found that the kinds and contents of various carbon nanostructured materials (such as SWCNTs, C60 and C60-d-CNTs) coupled with TiO2 can significantly enhance the photoactivity for hydrogen production, and the 5 wt% C60-d-CNTs/TiO2 nanocomposite exhibits the best performance. Experimental results suggest that the C60-d-CNTs as a novel carbon nanostructured material could be more beneficial for the photogenerated carrier separation than SWCNTs and C60 when these carbon nanostructured materials are coupled with TiO2.

Self-assembled fullerene (C60)-pentacene superstructures for photodetectors

Qin Tang,Guangpu Zhang,Bohong Jiang,Deyang Ji,Huihui Kong,Kristina Riehemann,Qingmin Ji,Harald Fuchs

Fullerene assembling with specific donor molecules would yield multifunctional metamaterials via the collective behavior, wherein linear acenes are widely used as donor molecules to construct the charge-transfer heterojunction structure with fullerene. However, they are generally prepared by vacuum deposition due to the insoluble property of high-performance linear acenes molecules in common solvents, which makes the construction of fullerene with insoluble donor molecules still be a big challenge in the solution-processed method. To this end, chemical modification provides an effective solution-processed strategy to construct donor and acceptor systems. Here, the C 60 -pentacene is assembled into controllable flower-like superstructures by the surface grafting method. It is found that the nanofeatures of the microflowers could be regulated by temperature, resulting in dense-flakes morphology at room temperature and loose flakes at high temperatures. Furthermore, the dense-flakes microflowers structures with less mass but better crystalline structure exhibit better optoelectronic properties. Our results reveal an effective control on the nanofeatures of the self-assembled fullerenes complex superstructures and their role for the optoelectronic performance, which may promote the exploring of fullerene superstructures as photodetectors.

Uniaxiality-Induced Reduced-Pressure Synthesis of Ultrahard Paracrystalline Diamond

Yue Pan,Xiaohong Yuan,Yong Cheng,Baoyin Xu,Shucheng Liu,Zhitong Wang,Shida Wang,Kuo Hu,Shengcai Zhu,Quanjun Li,Ming-sheng Wang,Zhaodong Liu,Hu Tang,Bingbing Liu

Synthesizing fully sp 3 -bonded non-crystalline carbon remains a long-standing challenge due to the intrinsic instability of the sp 3 bond at ambient pressure. Recently, paracrystalline diamond, a new-form sp 3 -bonded non-crystalline carbon consisting of sub-nanometer-sized paracrystallites, has been synthesized from face-centered cubic C 60 at 30 GPa, which has attracted attention due to its unique structural features and excellent physical properties. However, the ultrahigh synthesis pressure of paracrystalline diamond poses an obstacle to its large-scale production and applications. In this study, paracrystalline diamond is synthesized at an exceptionally low pressure (16 GPa) via inducing uniaxiality at high-pressure and high-temperature conditions, thereby breaking through the temperature-pressure phase diagram of C 60 . By combining structural characteristics and advanced molecular dynamics simulation, the remarkable reduction of synthesis pressure is attributed to the fact that the symmetry of the C 60 cage is broken due to the uniaxiality, which further allows the C 60 cage to collapse at much lower pressures. This work reveals the critical role of uniaxiality in the reduced-pressure synthesis of paracrystalline diamond, which may provide a potent methodological strategy for the development of novel low-cost high-pressure materials.

Raman Spectroscopy of AgNO3 Complex Encapsulated Fullerene (C60) Microcube

Ying Hou,Bei Nie,Zhe Li

Ag + -fullerene (C 60 ) hybrid microcrystal is synthesized by a liquid-liquid interfacial precipitation, which shows the broadened and weakened Raman bands , relative to original C 60 monomers . Our experimental results, combined with numerical calculation implicate that charge transfer and overlap orbitals between Ag + and C 60 steered this dramatic change of Raman response, due to greatly reduced molecular symmetry and redistributed electron density. Density functional theory (DFT) calculations rationalize the degenerated Raman spectra of Ag + -exohedral fullerene conjugate through ƞ 1 (C1-top) and ƞ 2 (C2-bridge) sites, elucidating that the binding nature (π-5 s and d-π*) shifts partially from electrostatic to covalent bond . This study is expected to render a general and easily accessible Raman approach in deciphering transition metal ion-fullerene interactions.

Selective adsorption and extraction of C70 and higher fullerenes on a reusable metal–organic framework MIL-101(Cr)

Cheng-Xiong Yang,Xiu-Ping Yan

The adsorption and extraction of fullerenes on the metal–organic framework MIL-101(Cr) were studied in detail in terms of kinetics, thermodynamics, adsorption isotherms, competitive adsorption, and breakthrough curves. The adsorption of C60 and C70 on MIL-101(Cr) follows a pseudo-second-order kinetic model. The adsorption rate constant for C70 is 3 to 5 times that for C60, showing faster and easier adsorption of C70 over C60 on MIL-101(Cr). Intraparticle diffusion model analysis reveals that the adsorption of C60 and C70 on MIL-101(Cr) proceeds by two phases, surface sorption and intraparticle/pore diffusion. The adsorption of fullerenes on MIL-101(Cr) is controlled by entropy changes. The maximum adsorption capacity for C70 at 30 °C (198.4 mg g−1) is 29 times that for C60 (6.76 mg g−1). MIL-101(Cr) shows much more favorable adsorption of C70 and higher fullerenes than C60 with a high selectivity (αC70/C60 = 24). Selective extraction of C70 and higher fullerenes from crude carbon soot can be easily achieved on MIL-101(Cr) via a simple adsorption–desorption process. The used MIL-101(Cr) can be regenerated by washing with o-dichlorobenzene under ultrasonication. The high selectivity, fast adsorption, easy desorption, and excellent reusability makes MIL-101(Cr) attractive as a novel adsorbent for the enrichment and extraction of C70 and higher fullerenes.

Fully evaporated interfacial layers for high-performance and batch-to-batch reproducible organic solar modules

Ze Jin,Cheng Shen,Haotian Hu,Chengcheng Han,Yongqi Bai,Mengjin Yang,Quan Liu,Ziyi Ge

Significant advancements in research have been made in recent years, with single-junction organic solar cells achieving efficiencies exceeding 20%. However, scaling up laboratory prototypes to large-area commercial modules remains challenging due to the absence of high-quality thin-film deposition techniques, particularly for ultra-thin interfacial layers. In here, we demonstrate a fully vacuum-processed approach utilizing InCl3 as hole-contact and C60/BCP as electron-contact interlayers, respectively, which guarantees dense and uniform charge transporting layers, while also ensuring consistent batch-to-batch reproducibility of module performance. In addition, such ultra-thin InCl3 layer significantly reduces the surface free energy of ITO substrates, thereby inhibiting the coffee ring effect during the active layer deposition, and obtaining a more homogeneous film in a large-scale size. As a result, we measured a power conversion efficiency of 16.5% (certified efficiency: 15.8%) under 1-sun illumination for the best-performing organic solar modules (aperture area = 15.6 cm2) with a geometric fill factor of 95.5%, making them highly completive amongst recently reported modules at similar size. Most importantly, our vacuum-processed interlayers exhibit excellent reproducibility and scale-up ability, paving a way to accelerate the industrialization of organic photovoltaic technology.

The mechanochemical reaction of C60 and Bi(NO3)3·5H2O

Min-Zun Ji,Feng-Chao Guo,Pu Zhang,Zhi-Xin Guo

The mechanochemical reaction of C60 and Bi(NO3)3·5H2O was performed under ball-milling condition. The product was well characterized by spectroscopic methods such as IR, Raman, UV-vis, 13C NMR, as well as elemental analysis method. The spectroscopic investigation indicates that some hydroxyl and nitro groups are attached to the C60 and no profound structural changes occur for the C60 cage in the product. The elemental analysis gives an average composition of C60(NO2)2(OH)21 for the product. A possible mechanism is suggested for the reaction.

Fullerene (C60)/CdS nanocomposite with enhanced photocatalytic activity and stability

Qiang Cai,Zhuofeng Hu,Qian Zhang,Boyuan Li,Zhurui Shen

Herein, the fullerene (C 60 )/CdS nanocomposite has been fabricated by a facile one-pot hydrothermal method. Its photocatatlytic hydrogen (H 2 ) evolution rate and degradation efficiency of Rhodamine B (Rh B) are evaluated under visible light irradiation (λ   ≥   420   nm). The content of C 60 has been changed from 0.4   wt% to 8   wt%, and the optimal value for photocatalytic activity is determined to be 0.4   wt%. The H 2 evolution rate over this optimal sample reaches 1.73   mmol   h −1   g −1 and its apparent degradation rate of Rh B is 0.089   min −1 (degradation efficiency of 97% within 40   min), which is 2.3 times and 1.5 times compared to that of pure CdS reference. Moreover, the photocorrosion of CdS in composite is effectively suppressed, and its photocatalytic activity can be well maintained after three recycles (97.8% retaining for composite vs. 84.4% retaining for CdS). Then, the enhanced photocatalytic activity and stability of C 60 /CdS nanocomposite are further studied by spectroscopic and electrochemical methods. Results show that the C 60 species covering on the surface of CdS can efficiently accelerate the separation and transfer of photoexcited charge carriers, which can improve its activity, and reduce the photocorrosion of CdS.

Novel efficient C60-based inverted perovskite solar cells with negligible hysteresis

Xingyue Liu,Zhiyong Liu,Haibo Ye,Yuxue Tu,Bo Sun,Xianhua Tan,Tielin Shi,Zirong Tang,Guanglan Liao

Fullerenes have been widely used as the electron transport layers (ETL) for planar-heterojunction perovskite solar cells (PSCs), due to their superior abilities in electron transporting, hysteresis suppression and low-temperature processing. Here, we demonstrate a novel inverted PSC with evaporated C 60 as ETL and dopant-free copper phthalocyanine (CuPc) as hole transport layer (HTL). The C 60 ETL can not only transport photogenerated electrons, but also passivate grain boundaries and surfaces of perovskite films effectively. By optimizing the thickness of the C 60 ETL, a champion power conversion efficiency (PCE) of 16.72% is obtained with almost no hysteresis and less than 10% decay in efficiency is observed during a two-week stability test. To the best of our knowledge, this is the highest efficiency of the inverted PSCs employing CuPc as HTL. For comparison, the devices using PCBM as ETL are also prepared and only achieve a highest efficiency of 15.74%. Various characterizations and analyses attest the enhanced charge transport and extraction as well as suppressed charge recombination and hysteresis for the C 60 -based devices. Since all the processes are accomplished under a low temperature, this enable us to fabricate flexible PSCs on polyethylene terephthalate (PET) substrates with a highest PCE of 12.96%. Our work provides a new strategy for fabricating cost-effective, highly efficient and hysteresis-free flexible PSCs in mass production.