Nanoscale platinum(0) clusters in glassy carbon: synthesis, characterization, and uncommon catalytic activity

Pocard, Nicolas L.; Alsmeyer, Daniel C.; McCreery, Richard L.; Neenan, Thomas X.; Callstrom, Matthew R.

doi:10.1021/ja00028a059

Cited by 74 publications

(35 citation statements)

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“…McCreery et al published a series of reports on the preparation of nanoscale Pt(0) clusters in GC by incorporating Pt in a GC precursor, followed by thermolysis at 600˚C. 29,30 The obtained film contained 2 -3 nm Pt nanoparticles, which show high electrocatalytic activity. Fujishima et al reported on electrochemically deposited Cu-or Ni-modified BDD films for electrocatalytically oxidizing sugars and amino acids.…”

Section: ·2 Sputtered Nano-film Electrodementioning

confidence: 99%

Newly Developed Chemical Probes and Nano-Devices for Cellular Analysis

et al. 2008

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Homeostasis in an organism is maintained by activities within and between cells. Therefore, one is required to analyze both the cellular activities within cells, such as metabolisms or signal transduction, and cellular interactions, such as ligand-receptor recognition. We have developed a cellular analyzing system including a "real-time cellular imaging system" and a "comprehensive analysis system for cellular responses" as shown in Fig. 1. The system has been established using newly developed chemical probes and nano-devices. As chemical probes, we have developed 1) molecular imaging probes, and 2) mass probes.As nano-devices, we built 1) nano electrochemical and optical probes, 2) a sputtered nano-film electrode, 3) nano-dot SPR, 4) a nano-dot target plate for MS, and 5) microfluidic devices. We will review each of these probes and devices, and finally introduce a "real-time cellular imaging system" with an application model using PC12 cells and a "comprehensive analysis system for cellular responses", which measured IL-1β (interleukin-1β) as an example. Chemical Probes 2·1 Molecular imaging probesFluorescent imaging based on fluorescent probes offers a highly sensitive, high-speed spatial and temporal analysis of cells, and is widely used in the fields of biology and physiology. A cellular analyzing system including a "real-time cellular imaging system" and a "comprehensive analyzing system for cellular responses" was developed. A "real-time cellular imaging system" is a system used to measure real-time imaging of multiple phenomena of a single cell with high special and temporal resolutions for the purpose to understand the pathology and physiology in a single cell and realize to single cell level diagnosis. A "real-time cellular imaging system" includes multi-probe imaging with AFM (atomic force microscopy), optical and SECM (scanning electrochemical microscopy) modes, which provides us with topological information and biochemical reactions at the local area of the interior and exterior of a cell. Scanning electrochemical/optical microscopy was applied to image PC12 cells. On the other hand, cells respond to their specific substances via their ligands. Therefore, the comprehensive analysis of protein-protein interaction is the important issue to determine the functions of cells. For this purpose, a "comprehensive analysis system for cellular responses" was developed. This system is based on SPR (surface plasmon resonance) and MS (mass spectrometry) using a nano-fabricated substrate. The interaction between IL-1β and anti-IL-1β antibodies was detected.

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Section: ·2 Sputtered Nano-film Electrodementioning

confidence: 99%

Newly Developed Chemical Probes and Nano-Devices for Cellular Analysis

et al. 2008

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“…Several different carbon materials such as mesostructured carbon materials [1] , graphitic nanofibers [2] , mesocarbon microbeads [3] and hollow carbon spheres [4] were also reported as the supports of the Pt or Pt-based alloy catalysts [5,6] . However, major problems with porous carbon supports are as follows: Firstly, they lack chemical stability due to severe oxidation at higher positive potentials [7] . Secondly, self-agglomeration of the carbon particles within practical electrode structures limits the access of the fuel or the oxidant to the active sites of the electrocatalysts [8] .…”

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confidence: 99%

Three-dimensional ordered macroporous platinum-based electrode for methanol oxidation

et al. 2006

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In this paper, three-dimensional ordered macroporous platinum catalysts with high real surface area were synthesized using the inverted colloidal crystals template technique and have been employed for the electrooxidation of methanol. The morphology and electrocatalytic behavior of the porous Pt electrodes were investigated with atomic force microscopy and electrochemical techniques. For the same amount of Pt deposited, the real surface areas of the electrodes are 9.16 and 8.00 cm 2 for the porous electrodes with pore size of 320 and 500 nm respectively, which are more than 5 times larger than the directly deposited Pt electrode (1.4 cm 2 ). The pore size effect on the methanol electrooxidation was investigated by testing low concentration solution of methanol and porous materials with different pore sizes. The synthesized macroporous Pt electrode shows high stability toward the electrooxidation of methanol and is promising for the direct methanol fuel cell.The attractive application of the direct oxidation methanol fuel cell (DMFC) in wide application areas, such as portable energy and stationary power suppliers, stimulates researchers to search for optimal anodic electrocatalysts for the oxidation of methanol. In practical performance, the catalysts are generally dispersed as nanoparticles for conducting supports with high surface area for obtaining maximum catalyst utilization. Porous carbon is one of the well-known supports for the dispersion of electrocatalysts. Several different carbon materials such as mesostructured carbon materials [1] , graphitic nanofibers [2] , mesocarbon microbeads [3] and hollow carbon spheres [4] were also reported as the supports of the Pt or Pt-based alloy catalysts [5,6] . However, major problems with porous carbon supports are as follows: Firstly, they lack chemical stability due to severe oxidation at higher positive potentials [7] . Secondly, self-agglomeration of the carbon particles within practical electrode structures limits the access of the fuel or the oxidant to the active sites of the electrocatalysts [8] . In order to improve the stability of the supports, Honda et al. used the conductive nanoporous diamond as a support of Pt nanoparticles [9] . Other interesting reports on the preparation of platinum nanostructures in ionic liquids using electrochemical or chemical methods have appeared recently [10][11][12] .Here we report the preparation of 3D ordered macroporous Pt frameworks by using the inverted colloidal crystals template technique. This technique has been developed recently for the preparation photonic materials [13] . The sizes of the pores and the periodicity of the porous structures can be precisely controlled and readily tuned by changing the sizes of the colloids and the thickness of the templates [14] . Special catalytic activity of the prepared macroporous structured catalysts can be expected due to the high surface to volume ratios and the special structure of the roughened materials. In addition, the stable voids within the colloidal crystals can be ...

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“…Nanostructures have received great attention recently due to their special optical, electronic, magnetic and chemical properties [1][2][3][4][5]. The most popular approach involves the synthesis of nanoparticles in situ within the block copolymer template by using preformed micelles of block copolymers containing metal precursors [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of polystyrene-b-poly(2-vinylpyridine) coordinated to metal or metal ion nanoparticles

Lekesiz

Kaleli

Uyar

et al. 2014

Journal of Analytical and Applied Pyrolysis

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a b s t r a c tIn this study, Co, Cr or Au 3+ functional polystyrene-block-poly(2-vinylpyridine), PS-b-P2VP complexes were prepared and characterized. Coordination of metal atom or ion to nitrogen atom of pyridine rings was confirmed by FTIR analyses. The strength and efficiency of coordination of P2VP blocks to Co, Cr or Au 3+ mainly depends on charge and stability of the complex formed that is mainly related to the energy of d orbitals. The results reveal that the thermal stability of the polymer composite formed increases with the increase in strength of the coordination. Changes in thermal decomposition mechanism and product distribution were recorded. Degradation of P2VP units coordinated to Cr, Co or Au 3+ was started by loss of pyridine units leaving an unsaturated and/or crosslinked polymer backbone that degraded at relatively high temperatures.

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Nanoscale platinum(0) clusters in glassy carbon: synthesis, characterization, and uncommon catalytic activity

Abstract: Scheme 111 3 4 3 Ph-I, X = N3 or X OTMS 3 r' 3 b "-HX and Phl 3c

Cited by 74 publications

References 0 publications

Newly Developed Chemical Probes and Nano-Devices for Cellular Analysis

Newly Developed Chemical Probes and Nano-Devices for Cellular Analysis

Three-dimensional ordered macroporous platinum-based electrode for methanol oxidation

Preparation and characterization of polystyrene-b-poly(2-vinylpyridine) coordinated to metal or metal ion nanoparticles

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