نتایج جستجو برای: nanoporous structure

تعداد نتایج: 1572004  

2015
Roberto Nisticò Paola Avetta Paola Calza Debora Fabbri Giuliana Magnacca Dominique Scalarone

Highly selective porous films were prepared by spin-coating deposition of colloidal silica nanoparticles on an appropriate macroporous substrate. Silica nanoparticles very homogenous in size were obtained by sol-gel reaction of a metal oxide silica precursor, tetraethyl orthosilicate (TEOS), and using polystyrene-block-poly(ethylene oxide) (PS-b-PEO) copolymers as soft-templating agents. Nanopa...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2012
Hossein Heli Fatemeh Pourbahman Naghmeh Sattarahmady

Nickel microspheres were synthesized via a water-in-oil reverse nanoemulsion system using nickel nitrate as the nickel precursor and hydrazine hydrate as the reducing agent. The nanoemulsion was a triton X-100/cyclohexane/water ternary system. The surface morphology of the nickel microspheres was studied by scanning electron microscopy, which indicated that the microspheres had a nanoporous str...

Journal: :Physical chemistry chemical physics : PCCP 2011
Masataka Hakamada Masaki Takahashi Toshiyuki Furukawa Kazuki Tajima Kazuki Yoshimura Yasumasa Chino Mamoru Mabuchi

Desorption of thiolate self-assembled monolayers (SAMs) seriously limits the fabrication of thiol-based devices. Here we demonstrate that nanoporous Au produced by dealloying Au-Ag alloys exhibits high electrochemical stability against thiolate desorption. Nanoporous Au has many defective sites, lattice strain and residual Ag on the ligament surface. First-principles calculations indicate that ...

2006
David W. Gidley Richard S. Vallery

■ Abstract Beam-based positron annihilation spectroscopy (PAS) is a powerful porosimetry technique with broad applicability in the characterization of nanoporous thin films, especially insulators. Pore sizes and distributions in the 0.3–30 nm range are nondestructively determined with only the implantation of low-energy positrons from a table-top beam. Depth-profiling with PAS has proven to be ...

2010
Kwangsu Kim Woonhyuk Baek Jung-Min Kim Tae-Sik Yoon Hyun Ho Lee Chi Jung Kang Yong-Sang Kim

Toluene gas was successfully measured at room temperature using a device microfabricated by a nanoimprinting method. A highly uniform nanoporous thin film was produced with a dense array of titania (TiO(2)) pores with a diameter of 70 ≈ 80 nm using this method. This thin film had a Pd/TiO(2) nanoporous/SiO(2)/Si MIS layered structure with Pd-TiO(2) as the catalytic sensing layer. The nanoimprin...

2012
Varun Rai Hapuarachchige C. Hapuarachchi Lee Ching Ng Siew Hwa Soh Yee Sin Leo Chee-Seng Toh

A nanoporous alumina membrane-based ultrasensitive DNA biosensor is constructed using 5'-aminated DNA probes immobilized onto the alumina channel walls. Alumina nanoporous membrane-like structure is carved over platinum wire electrode of 76 µm diameter dimension by electrochemical anodization. The hybridization of complementary target DNA with probe DNA molecules attached inside the pores influ...

Journal: :Nanoscale 2013
Vincent S D Voet Martijn Tichelaar Stefania Tanase Marjo C Mittelmeijer-Hazeleger Gerrit ten Brinke Katja Loos

The fabrication of nanoporous poly(vinylidene fluoride) (PVDF) and PVDF/nickel nanocomposites from semicrystalline block copolymer precursors is reported. Polystyrene-block-poly(vinylidene fluoride)-block-polystyrene (PS-b-PVDF-b-PS) is prepared through functional benzoyl peroxide initiated polymerization of VDF, followed by atom transfer radical polymerization (ATRP) of styrene. The crystalliz...

2015
Yang Li Mingfa Zhang Xiaopeng Zhang Guocheng Xie Zhiqiang Su Gang Wei

We describe the preparation of nanoporous carbon nanofibers (CNFs) decorated with platinum nanoparticles (PtNPs) in this work by electrospining polyacrylonitrile (PAN) nanofibers and subsequent carbonization and binding of PtNPs. The fabricated nanoporous CNF-PtNP hybrids were further utilized to modify glass carbon electrodes and used for the non-enzymatic amperometric biosensor for the highly...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2007
Suhan Kim Jinhan Cho Kookheon Char

Thermally stable nanoporous organosilicate thin films were realized by the microphase separation of pore-generating polymers mixed with an organosilicate matrix to be antireflective coatings (ARCs), for which a thin film with a refractive index (n) of 1.23 for zero reflection is required. The refractive index of such nanoporous organosilicate films can be tuned from 1.39 down to 1.23 by incorpo...

2016
KONSTANTIN MOCHALOV ALEXEY BOBROVSKY DARIA SOLOVYEVA PAVEL SAMOKHVALOV IGOR NABIEV VLADIMIR OLEINIKOV

Unique properties of nanohybrid composites based on different types of porous polymer matrices doped with fluorescent nanoparticles (quantum dots, QDs) are determined by the combination of the mechanical properties of the host matrix (flexibility, chemical stability, etc.) and a high luminescence intensity and extreme stability of QDs. Here, we report on the preparation, optical and microstruct...

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