Supported monodisperse Pt nanoparticles from [Pt-3(CO)(3)(mu(2)-CO)(3)](5)(2-) clusters for investigating support-Pt interface effect in catalysis

MOST of China [2011CB932403]; NSFC [21131005, 21021061, 20925103, 20923004]; Fok Ying Tung Education Foundation [121011]Here we present a surfactant-free strategy to prepare supported monodisperse Pt nanoparticles from molecular [Pt-3(CO)(3)(mu(2)-CO)(3)](5)(2-) clusters. The strategy allows facile deposition of same-sized Pt nanoparticles on various oxide supports to unambiguously study the interface effect between noble metal and metal oxide in catalysis. In this study, Fe2O3 is demonstrated to be a superior support over TiO2, CeO2 and SiO2 to prepare highly active supported Pt nanoparticles for CO oxidation, which indicates that the interfaces between Pt and iron oxide are the active sites for O-2 activation and CO oxidation

C2H2 Treatment as a Facile Method to Boost the Catalysis of Pd Nanoparticulate Catalysts

Zheng, NF (通讯作者)A facile method to boost the catalysis of Pd nanoparticulate catalysts by simple C2H2 treatment is developed. During the C2H2 treatment, Pd nanoparticles serve as active catalysts to polymerize C2H2 into transpolyacetylene. The deposition of trans-polyacetylene layer on Pd nanoparticles makes their surface hydrophobic. Such a hydrophobic surface modification helps to accumulate more hydrophobic substrates during catalysis, making the modified Pd nanoparticulate catalysts more active than untreated catalysts in the catalytic reaction involving hydrophobic substrates. Moreover, the coating of polyacetylene on Pd creates encapsulated Pd nanocatalysts, stabilizing Pd nanoparticles against sintering or aggregation. Since the catalytic polymerization of polyacetylene on Pd is not facet dependent, the development is readily applied to enhance the catalysis of commercial Pd nanoparticulate catalysts by simple C2H2 treatment.MOST of China 2011CB932403 NSFC 21131005 2133300

Stabilizing subnanometer Ag(0) nanoclusters by thiolate and diphosphine ligands and their crystal structures

MOST of China [2011CB932403]; NSFC [21131005, 21021061, 20925103]; Fok Ying Tung Education Foundation [121011]The combined use of thiolate and diphosphine as surface ligands helps to stabilize subnanometer Ag(0) nanoclusters, resulting in the successful crystallization of two Ag(0)-containing nanoclusters (Ag-16 and Ag-32) for X-ray single crystal analysis. Both clusters have core-shell structures with Ag-8(6+) and Ag-22(12+) as their cores, which are not simply either fragments of face-centered cubic metals or their fivefold twinned counterparts. The clusters display UV-Vis absorption spectra consisting of molecule-like optical transitions

One-Pot, High-Yield Synthesis of 5-Fold Twinned Pd Nanowires and Nanorods

通讯作者地址: Zheng, NF (通讯作者), Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 2. Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] the presence of poly(vinylpyrrolidone) and I-, uniform Pd nanowires and nanorods have been successfully prepared. As-prepared one-dimensional Pd nanostructures have a 5-fold twinned structure. The twinned Pd nanowires can be further transformed into nanowires/nanorods with a smaller aspect ratio and finally to multiply twinned particles upon increasing the reaction time. With structural anisotropy, the one-dimensional. Pd nanostructures exhibit different chemical reactivities on their tips and sides.Chinese Ministry of Education108077 RFDP 200803841010 NNSFC 20871100 20721001 MSTC 2009CB930703 2007C1381530

Ice-templating of core/shell microgel fibers through 'Bricks-and-Mortar' assembly

通讯作者地址: Stucky, GD (通讯作者), Univ Calif Santa Barbara, Mat Res Lab, Dept Chem & Biochem, Santa Barbara, CA 93106 USA 地址: 1. Univ Calif Santa Barbara, Mat Res Lab, Dept Chem & Biochem, Santa Barbara, CA 93106 USA 电子邮件地址: [email protected] 'bricks-and-mortar' assembly approach can be used to create well-defined fibers on the microscale with alternating organic-inorganic arrangement through a simple ice-templating strategy. ne fibers are constructed from closely packed monodisperse inorganic nanoparticles@PNIPAm core/shelf microgels. A series of functional 'bricks', such as core/shell and hollow nanoparticles are prepared

A multiple coating route to hollow carbon spheres with foam-like shells and their applications in supercapacitor and confined catalysis

Fang, XL (通讯作者)Recent advances in the sol-gel process derived resorcinol-formaldehyde (RF) coating strategies offer new opportunities for the synthesis and applications of hollow carbon spheres (HCS). Due to the lack of an effective route for controlling the pore structures, the synthesis of RF resin derived HCS with a high specific surface area for promising applications is still a challenge. In this work, we present a facile and effective template-directed multiple coating route to synthesize RF resin derived HCS with foam-like shells (HCSF). The as-synthesized HCSF exhibit a significantly higher specific surface area (1286 m(2) g(-1)) and larger pore volumes (2.25 cm(3) g(-1)) than the RF resin derived HCS (639 m(2) g(-1) and 0.56 cm(3) g(-1)). Our experiments demonstrated that the cationic surfactant CTAB plays a critical role in forming the foam-like pore structure. Compared with the RF resin derived HCS, the as-synthesized HCSF show advantageous performances in supercapacitor and confined catalysis due to their unique pore structures.NSFC 21301144 21131005 21333008 20925103 21021061 MOST of China 2011CB93240

Small molecules control the formation of Pt nanocrystals: a key role of carbon monoxide in the synthesis of Pt nanocubes

通讯作者地址: Zheng, NF (通讯作者), Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 电子邮件地址: [email protected], [email protected] many previous studies, nonaqueous synthesis of Pt nanocubes with tunable size has been achieved by the use of metal carbonyls (e.g., Fe(CO)(5), Co-2(CO)(8), W(CO)(6)). The presence of zero-valent metals in the carbonyls was demonstrated as the key factor to the nanocube formation but the role of CO was entirely ignored. By using CO alone, we have now demonstrated that the favorable growth of Pt nanocubes in the presence of CO is mainly owing to the effect that the Pt (100) surface is stabilized by the co-adsorption of CO and amine.NSFC 20925103,20871100,20721001; Fok Ying Tung Education Foundation,121011; MSTC,2011CB932403,2009CB930703; NSF of Fujian Province,2009J06005; Key Scientific Project of Fujian Province 2009HZ0002-

Near-infrared light-triggered irreversible aggregation of poly(oligo(ethylene glycol) methacrylate)-stabilised polypyrrole nanoparticles under biologically relevant conditions

National Nature Science Foundation of China [21021061, 20925103]We report the use of near-infrared (NIR) radiation to trigger the irreversible flocculation of poly(oligo(ethylene glycol) methacrylate)stabilised polypyrrole nanoparticles in physiological buffer

Multifunctional ultrasmall Pd nanosheets for enhanced near-infrared photothermal therapy and chemotherapy of cancer

通讯作者地址: Zheng, NF 电子邮件地址:[email protected] (NIR) photothermal therapy has developed very quickly in recent years. However, its clinical applications are hindered by many practical problems, such as low accumulation in tumors, high laser power density and high biotoxicity in vivo. Herein, a versatile system combining chemotherapy with photothermal therapy for cancer therapy using ultrasmall Pd nanosheets (SPNS) has been developed. The SPNS can serve as pH-responsive drug carriers to efficiently deliver DOX into cancer cells and tumors. On the other hand, the coordinative loading of DOX on SPNS enhances its accumulation in tumor tissue. So we can efficiently ablate tumor using low-intensity laser radiation. Importantly, with ultrasmall size (similar to 4.4 nm), SPNS surface-functionalized with reduced glutathione (GSH) can be cleared from the body through the renal system into the urine. This cancer therapeutic nanosystem, which exhibits a significant synergistic effect and low systemic toxicity, has great potential for clinical applications.Ministry of Science and Technology of China 2011CB932403 2014CB932004 National Natural Science Foundation of China 2113100

Sub-10-nm Pd Nanosheets with Renal Clearance for Efficient Near-Infrared Photothermal Cancer Therapy

通讯作者地址: Zheng, NF (通讯作者)Efficient renal clearance is of fundamentally important property of nanoparticles for their in vivo biomedical applications. In this work, we report the successful synthesis of ultra-small Pd nanosheets (SPNS) with an average diameter of 4.4 nm and their application in photothermal cancer therapy using a near infrared laser. The ultra-small Pd nanosheets have strong optical absorption in the NIR region and high photothermal conversion efficiency (52.0%) at 808 nm. After being surface-functionalized with reduced glutathione (GSH), the SPNS-GSH was administered to mice to investigate the biodistribution, photothermal efficacy and tumor ablation in vivo. The in vivo photothermal therapy studies clearly demonstrate that surface modification with GSH allows the nanosheets to exhibit prolonged blood circulation and thus high accumulation in tumors. Upon 808 nm NIR irradiation, the tumors can be completely ablated. More importantly, with the size below the renal filtration limit (<10 nm), the GSHylated Pd nanosheets can be nicely cleared from body through the renal excretion route and into urine. Together with the high efficacy of NIR photothermal therapy, the unique renal clearance properties make the ultra-small Pd nanosheets promising for practical use in photothermal cancer therapy.MOST of China 2011CB932403 2014CB932004 NSFC of China 21131005 2092510