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Search for "alumina" in Full Text gives 154 result(s) in Beilstein Journal of Nanotechnology.

Synthesis, spectroscopic characterization and thermogravimetric analysis of two series of substituted (metallo)tetraphenylporphyrins

  • Rasha K. Al-Shewiki,
  • Carola Mende,
  • Roy Buschbeck,
  • Pablo F. Siles,
  • Oliver G. Schmidt,
  • Tobias Rüffer and
  • Heinrich Lang

Beilstein J. Nanotechnol. 2017, 8, 1191–1204, doi:10.3762/bjnano.8.121

Graphical Abstract
  • soluble in solvents such as CH2Cl2, CHCl3, MeCN, DMSO, DMF it is possible to follow certain “criteria of purity” established by White, Bachmann and Burnham [21]. Thus, analytical amounts of these (metallo)porphyrins were chromatographed by thin layer chromatography (TLC) on alumina by using CHCl3/n-hexane
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Published 02 Jun 2017

Structural properties and thermal stability of cobalt- and chromium-doped α-MnO2 nanorods

  • Romana Cerc Korošec,
  • Polona Umek,
  • Alexandre Gloter,
  • Jana Padežnik Gomilšek and
  • Peter Bukovec

Beilstein J. Nanotechnol. 2017, 8, 1032–1042, doi:10.3762/bjnano.8.104

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  • Instrument in the temperature range from 25 to 950 °C with a heating rate of 10 K·min−1 in an argon atmosphere. Around 10 mg of sample was put in a 150 μL alumina crucible. The flow rate of Ar was 100 mL·min−1. In all the measurements the baseline was subtracted. Analysis of the released gasses was performed
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Published 10 May 2017

Study of the correlation between sensing performance and surface morphology of inkjet-printed aqueous graphene-based chemiresistors for NO2 detection

  • F. Villani,
  • C. Schiattarella,
  • T. Polichetti,
  • R. Di Capua,
  • F. Loffredo,
  • B. Alfano,
  • M. L. Miglietta,
  • E. Massera,
  • L. Verdoliva and
  • G. Di Francia

Beilstein J. Nanotechnol. 2017, 8, 1023–1031, doi:10.3762/bjnano.8.103

Graphical Abstract
  • chemiresistor have been analysed upon NO2 exposure at standard ambient temperature and pressure. Moreover, as comparison, inkjet-printed sensors have been manufactured on standard insulating substrates, namely alumina (Al2O3), and silicon dioxide (Si/SiO2). They have been characterized through gas sensing and
  • = 20 kΩ). The device printed on alumina (device D-AO) resulted in 31 overlapped layers, so driving the base resistance to 30 kΩ, similar to those of the paper-based devices. The fourth typology of device has been fabricated on silicon dioxide. It should be pointed out that the wetting of the aqueous
  • temperature and under ambient conditions. Sensor-device fabrication Different substrates, paper (Epson, premium glossy photo paper), alumina (purity 96%, Rockwell hardness = 82, resistivity > 1014 Ω·cm, roughness = 12–20 microinches) and Si/SiO2 (thermal oxide 300 nm, Silicon Valley), with gold electrodes
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Published 09 May 2017

Vapor deposition routes to conformal polymer thin films

  • Priya Moni,
  • Ahmed Al-Obeidi and
  • Karen K. Gleason

Beilstein J. Nanotechnol. 2017, 8, 723–735, doi:10.3762/bjnano.8.76

Graphical Abstract
  • that can be used as a cathode for micro lithium ion batteries. Composite electrodes for supercapacitors have been developed by forming pseudo-capacitive, conjugated polymer thin films on various electrodes such as vertically aligned CNTs, aligned graphene flakes, and nano-porous anodized alumina (NAA
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Published 28 Mar 2017

Gas sensing properties of MWCNT layers electrochemically decorated with Au and Pd nanoparticles

  • Elena Dilonardo,
  • Michele Penza,
  • Marco Alvisi,
  • Riccardo Rossi,
  • Gennaro Cassano,
  • Cinzia Di Franco,
  • Francesco Palmisano,
  • Luisa Torsi and
  • Nicola Cioffi

Beilstein J. Nanotechnol. 2017, 8, 592–603, doi:10.3762/bjnano.8.64

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  • MWCNTs, for gas sensing applications. Experimental Preparation of metal-decorated MWCNT-based chemiresistors MWCNT networked films were grown by chemical vapor deposition (CVD) directly onto the surface of an alumina substrate that was previously coated with a cobalt (Co) sputtered catalytic layer (≈6 nm
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Published 10 Mar 2017

Liquid permeation and chemical stability of anodic alumina membranes

  • Dmitrii I. Petukhov,
  • Dmitrii A. Buldakov,
  • Alexey A. Tishkin,
  • Alexey V. Lukashin and
  • Andrei A. Eliseev

Beilstein J. Nanotechnol. 2017, 8, 561–570, doi:10.3762/bjnano.8.60

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  • , Russia 10.3762/bjnano.8.60 Abstract A study on the chemical stability of anodic alumina membranes and their performance in long-term water and organic solvent permeation experiments is reported. Anodic alumina possesses high stability for both protonic and aprotonic organic solvents. However, serious
  • channels blocking. This process intensifies in basic pH due to the high positive charge of the anodic alumina surface. An approach for improving anodic aluminum oxide stability towards dissolution in water by carbon CVD coating of the membrane walls is suggested. Keywords: anodic alumina; carbon-modified
  • media [1][13][14][15]. In contrast, the narrow pore size distribution of anodic alumina membranes should result in a sharp cut-off curve and excellent filtration characteristics [1]. The possible reason for low publishing and application activity in the field is the degradation of AAO membrane materials
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Published 06 Mar 2017

Formation and shape-control of hierarchical cobalt nanostructures using quaternary ammonium salts in aqueous media

  • Ruchi Deshmukh,
  • Anurag Mehra and
  • Rochish Thaokar

Beilstein J. Nanotechnol. 2017, 8, 494–505, doi:10.3762/bjnano.8.53

Graphical Abstract
  • obtain cobalt nanostructures of desired size and shape such as spherical nanoparticles [14][15] synthesized by high-temperature chemical reduction while controlling the pH value, cobalt–polymer composite tubes [16] formed by using alumina templates, cobalt cubes [17] produced in imidazolium ionic liquid
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Published 23 Feb 2017

Functionalized TiO2 nanoparticles by single-step hydrothermal synthesis: the role of the silane coupling agents

  • Antoine R. M. Dalod,
  • Lars Henriksen,
  • Tor Grande and
  • Mari-Ann Einarsrud

Beilstein J. Nanotechnol. 2017, 8, 304–312, doi:10.3762/bjnano.8.33

Graphical Abstract
  • cm−1. Thermogravimetric analysis (TGA) was acquired on a Netzsch Jupiter STA 449 C using an alumina crucible. The nanoparticles were firstly heat-treated from 25 to 150 °C (10 °C·min−1), maintained at 150 °C for 30 min, cooled down to room temperature, and heat-treated again from 25 to 200 °C (2
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Published 31 Jan 2017

Sensitive detection of hydrocarbon gases using electrochemically Pd-modified ZnO chemiresistors

  • Elena Dilonardo,
  • Michele Penza,
  • Marco Alvisi,
  • Gennaro Cassano,
  • Cinzia Di Franco,
  • Francesco Palmisano,
  • Luisa Torsi and
  • Nicola Cioffi

Beilstein J. Nanotechnol. 2017, 8, 82–90, doi:10.3762/bjnano.8.9

Graphical Abstract
  • -like ZnO-based chemiresistive gas sensor. After the annealing at 550 °C, pristine and Pd-modified ZnO were redispersed in ACN and drop-cast on alumina substrates to obtain sensing layers between gold contacts. These assemblies were subsequently thermally stabilized at 300 °C for 2 h. The description of
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Published 10 Jan 2017

Surface-enhanced Raman scattering of self-assembled thiol monolayers and supported lipid membranes on thin anodic porous alumina

  • Marco Salerno,
  • Amirreza Shayganpour,
  • Barbara Salis and
  • Silvia Dante

Beilstein J. Nanotechnol. 2017, 8, 74–81, doi:10.3762/bjnano.8.8

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  • anodic porous alumina (tAPA) was fabricated from a 500 nm thick aluminum (Al) layer coated on silicon wafers, through single-step anodization performed in a Teflon electrochemical cell in 0.4 M aqueous phosphoric acid at 110 V. Post-fabrication etching in the same acid allowed obtaining tAPA surfaces
  • of the use of tAPA–Au substrates as a platform for the development of surface-enhanced Raman spectroscopy (SERS) biosensors on living cells. In the future, these tAPA–Au-SLB substrates will be investigated also for drug delivery of bioactive agents from the APA pores. Keywords: anodic porous alumina
  • ; SERS; nanopores; supported lipid bilayers; thiols; Introduction Anodic porous alumina (APA) is a layered material usually obtained in thick form (≈10 µm thickness scale) from electrochemical anodization in the acidic aqueous electrolyte of aluminum (Al) foils [1]. In APA, the control of pore size
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Published 09 Jan 2017

From iron coordination compounds to metal oxide nanoparticles

  • Mihail Iacob,
  • Carmen Racles,
  • Codrin Tugui,
  • George Stiubianu,
  • Adrian Bele,
  • Liviu Sacarescu,
  • Daniel Timpu and
  • Maria Cazacu

Beilstein J. Nanotechnol. 2016, 7, 2074–2087, doi:10.3762/bjnano.7.198

Graphical Abstract
  • Mettler Toledo TGA-SDTA851e type thermogravimetric analyzer under nitrogen flow (20 mL/min), at 10 °C∙min−1 heating rate for samples of 2–5 mg each. Alumina crucibles (70 µL) were used as sample holders. Every experiment was repeated three times and showed a good reproducibility. The data were processed
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Published 28 Dec 2016

Nanostructured SnO2–ZnO composite gas sensors for selective detection of carbon monoxide

  • Paul Chesler,
  • Cristian Hornoiu,
  • Susana Mihaiu,
  • Cristina Vladut,
  • Jose Maria Calderon Moreno,
  • Mihai Anastasescu,
  • Carmen Moldovan,
  • Bogdan Firtat,
  • Costin Brasoveanu,
  • George Muscalu,
  • Ion Stan and
  • Mariuca Gartner

Beilstein J. Nanotechnol. 2016, 7, 2045–2056, doi:10.3762/bjnano.7.195

Graphical Abstract
  • prepared and deposited on a miniaturized porous alumina transducer using the sol–gel and dip coating method. The transducer, developed by our research group, contains Au interdigital electrodes on one side and a Pt heater on the other side. The sensing films were characterized using SEM and AFM techniques
  • compared to its response to CO2, CH4, and C3H8, thus the sensor is considered to be selective for CO under these test conditions. Keywords: composite thin film sensor; dip coating; low detection limit; miniaturized alumina transducer; selective CO detection; sol–gel; Introduction For the past decade, the
  • applications in areas where gas burners are still used. Experimental Sensor fabrication The miniaturized alumina transducer was designed and developed using specific microtechnology processes, clean room facilities and software. The transducer fabrication involved two major steps: a) simulation for choosing
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Published 22 Dec 2016

Organoclay hybrid materials as precursors of porous ZnO/silica-clay heterostructures for photocatalytic applications

  • Marwa Akkari,
  • Pilar Aranda,
  • Abdessalem Ben Haj Amara and
  • Eduardo Ruiz-Hitzky

Beilstein J. Nanotechnol. 2016, 7, 1971–1982, doi:10.3762/bjnano.7.188

Graphical Abstract
  • formation of silica/alumina-clay heterostructures providing acid-catalyst behavior [18][19]. Similarly, silica–titania delaminated clays have been also prepared via the generation of TiO2/SiO2 NP in the interlayer space of smectites and vermiculites modified with long-chain alkylammonium species, promoting
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Published 12 Dec 2016

Low temperature co-fired ceramic packaging of CMOS capacitive sensor chip towards cell viability monitoring

  • Niina Halonen,
  • Joni Kilpijärvi,
  • Maciej Sobocinski,
  • Timir Datta-Chaudhuri,
  • Antti Hassinen,
  • Someshekar B. Prakash,
  • Peter Möller,
  • Pamela Abshire,
  • Sakari Kellokumpu and
  • Anita Lloyd Spetz

Beilstein J. Nanotechnol. 2016, 7, 1871–1877, doi:10.3762/bjnano.7.179

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  • form small-sized patterns to connect the closely spaced contact pads. The ICA was applied on the contact pads of the LTCC as “bumps” with a stamping process (Figure 2). The stamp was made of alumina by laser processing. The sensor chip was glued onto the bumps by epoxy and cured at 150 °C on a hot
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Published 29 Nov 2016

Effective intercalation of zein into Na-montmorillonite: role of the protein components and use of the developed biointerfaces

  • Ana C. S. Alcântara,
  • Margarita Darder,
  • Pilar Aranda and
  • Eduardo Ruiz-Hitzky

Beilstein J. Nanotechnol. 2016, 7, 1772–1782, doi:10.3762/bjnano.7.170

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  • . Structurally each silicate layer is formed by the repetition of a central octahedral alumina sheet sandwiched by two tetrahedral silica sheets [3]. Isomorphic substitutions in the octahedral and, partially, in the tetrahedral sheets result in a net negative charge of the layers that is compensated by cations
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Published 18 Nov 2016

Prediction of the mechanical properties of zeolite pellets for aerospace molecular decontamination applications

  • Guillaume Rioland,
  • Patrick Dutournié,
  • Delphine Faye,
  • T. Jean Daou and
  • Joël Patarin

Beilstein J. Nanotechnol. 2016, 7, 1761–1771, doi:10.3762/bjnano.7.169

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  • optics could become covered by molecules, leading to a deterioration of these tools. Porous alumina, silica, zeolites and charcoal have been tested to solve the molecular contamination issue, and zeolites have been selected as the best candidates. At very low concentration, zeolites are able to trap
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Published 18 Nov 2016

Properties of Ni and Ni–Fe nanowires electrochemically deposited into a porous alumina template

  • Alla I. Vorobjova,
  • Dmitry L. Shimanovich,
  • Kazimir I. Yanushkevich,
  • Sergej L. Prischepa and
  • Elena A. Outkina

Beilstein J. Nanotechnol. 2016, 7, 1709–1717, doi:10.3762/bjnano.7.163

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  • Physics, National Academy of Sciences of Belarus, P. Brovka 19, Minsk 220072, Belarus 10.3762/bjnano.7.163 Abstract The comparative analysis of the electrochemical deposition of Ni and Ni–Fe nanowires (NWs) into ordered porous alumina templates is presented. The method developed allows for obtaining NWs
  • value of Ni–Fe NWs in the alumina template is higher than that of the Ni sample and bulk Ni, also the Curie temperature of the Ni–Fe sample (790 K) is higher than that of the Ni sample one or bulk Ni. Keywords: electrochemical deposition; nanowire; porous alumina template; specific magnetization
  • thin-film and bulk analogues [6][7]. There are different methods to fabricate NWs including electrochemical deposition into porous alumina (PA) templates. The advantages of this method such as low cost, simplicity and efficient testability make it very attractive from the practical point of view [8][9
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Published 14 Nov 2016

Fingerprints of a size-dependent crossover in the dimensionality of electronic conduction in Au-seeded Ge nanowires

  • Maria Koleśnik-Gray,
  • Gillian Collins,
  • Justin D. Holmes and
  • Vojislav Krstić

Beilstein J. Nanotechnol. 2016, 7, 1574–1578, doi:10.3762/bjnano.7.151

Graphical Abstract
  • measuring the electrical conductivity, σNW, and field effect mobility, μNW, we were able to identify the dominant scattering mechanisms and the R-dependence of the electrostatic screening length. Ge NWs used in this study were synthesized at 400 °C on anodized alumina supports using a Au nanoparticle seeded
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Published 02 Nov 2016

Graphene-enhanced plasmonic nanohole arrays for environmental sensing in aqueous samples

  • Christa Genslein,
  • Peter Hausler,
  • Eva-Maria Kirchner,
  • Rudolf Bierl,
  • Antje J. Baeumner and
  • Thomas Hirsch

Beilstein J. Nanotechnol. 2016, 7, 1564–1573, doi:10.3762/bjnano.7.150

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  • arrays have been first fabricated 1995 by Masuda and Fukuda using a replication process of an anodized alumina structure [23]. Since then, a vast number of techniques has been invented. For example, as focused ion beam (FBI) milling allows a control of the size and shape of the nanoholes with good
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Published 01 Nov 2016

Enhanced detection of nitrogen dioxide via combined heating and pulsed UV operation of indium oxide nano-octahedra

  • Oriol Gonzalez,
  • Sergio Roso,
  • Xavier Vilanova and
  • Eduard Llobet

Beilstein J. Nanotechnol. 2016, 7, 1507–1518, doi:10.3762/bjnano.7.144

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  • the use of combined heating and pulsed UV light activation of indium oxide gas sensors for enhancing their performance in the detection of nitrogen dioxide in air. Indium oxide nano-octahedra were synthesized at high temperature (900 °C) via vapour-phase transport and screen-printed onto alumina
  • ) purchased from Sigma Aldrich, was placed on an alumina boat. The distance between the alumina boat and the silicon substrate was 1 cm and these were placed at the centre of the furnace. Temperature was raised to 900 °C at a rate of 15 °C/min, and kept constant for 120 min. The indium oxide nano-octahedra
  • mechanically removed from the silicon substrate employing a razor blade and mixed in a solution of 1,2-propanediol to form a printable ink. This ink was screen-printed on top of commercially available (Ceram Tech GmbH, Germany), alumina transducer elements, which comprised a pair of Pt interdigitated
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Published 25 Oct 2016

A composite structure based on reduced graphene oxide and metal oxide nanomaterials for chemical sensors

  • Vardan Galstyan,
  • Elisabetta Comini,
  • Iskandar Kholmanov,
  • Andrea Ponzoni,
  • Veronica Sberveglieri,
  • Nicola Poli,
  • Guido Faglia and
  • Giorgio Sberveglieri

Beilstein J. Nanotechnol. 2016, 7, 1421–1427, doi:10.3762/bjnano.7.133

Graphical Abstract
  • ZnO nanostructures is similar to that described in our previous work [24]. Thin films of metallic Zn with a thickness of 600 nm were deposited on 2 mm square alumina substrates by means of radio frequency (RF) magnetron sputtering. Thin deposited films of Zn were anodized in 2 M oxalic acid dihydrate
  • heater were deposited on the front and rear sides of the alumina substrate, respectively. During gas sensing tests, the conductance of the samples was monitored by means of the volt-amperometric technique and the applied voltage during the measurements was 1 V. We recorded the resistance of the
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Published 10 Oct 2016

Voltammetric determination of polyphenolic content in pomegranate juice using a poly(gallic acid)/multiwalled carbon nanotube modified electrode

  • Refat Abdel-Hamid and
  • Emad F. Newair

Beilstein J. Nanotechnol. 2016, 7, 1104–1112, doi:10.3762/bjnano.7.103

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  • polished with 0.05 μm alumina water slurry using a polishing cloth until the electrode surfaces developed a mirror finish. Then, it was rinsed thoroughly with double-distilled water. The PGA/MWCNT/GC modified electrode was prepared as follows. 20 µL of the MWCNT suspension was drop-casted onto the polished
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Published 29 Jul 2016

Functional fusion of living systems with synthetic electrode interfaces

  • Oskar Staufer,
  • Sebastian Weber,
  • C. Peter Bengtson,
  • Hilmar Bading,
  • Joachim P. Spatz and
  • Amin Rustom

Beilstein J. Nanotechnol. 2016, 7, 296–301, doi:10.3762/bjnano.7.27

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  • the NEI on top of the assembly. For additional pressure, a 5 g weight was placed on the setup (Figure 2b, FG) to enforce membrane penetration and overcome the low proportion and stochastic nature of nanoelectrode penetration observed for mammalian CHO cells using hollow alumina nanostraws [7]. The
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Published 26 Feb 2016

Synthesis and applications of carbon nanomaterials for energy generation and storage

  • Marco Notarianni,
  • Jinzhang Liu,
  • Kristy Vernon and
  • Nunzio Motta

Beilstein J. Nanotechnol. 2016, 7, 149–196, doi:10.3762/bjnano.7.17

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  • flow of a hydrocarbon gas over a catalyst in a tube furnace. The catalyst is typically transition metal nanoparticles on a support such as alumina. Materials grown on the catalyst are collected after cooling the furnace to room temperature. The key process parameters are the hydrocarbon and catalyst
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Published 01 Feb 2016

Linear and nonlinear optical properties of hybrid metallic–dielectric plasmonic nanoantennas

  • Mario Hentschel,
  • Bernd Metzger,
  • Bastian Knabe,
  • Karsten Buse and
  • Harald Giessen

Beilstein J. Nanotechnol. 2016, 7, 111–120, doi:10.3762/bjnano.7.13

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  • , Utikal et al. [61] buried gold gratings within dielectric waveguides consisting of alumina, indium tin oxide, or tungsten trioxide, respectively, and studied the third harmonic spectra. They found that the overall signal is generated not only by the gold itself, but by the dielectric waveguide as well
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Published 26 Jan 2016
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