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

• (Figure 7B) it is clearly observed the presence of the metal oxide NP associated with the clay. In the SiO2-SEP-CTA heterostructure (Figure 7A) the fibers covered by a coating, which after calcination is transformed in more discrete nanoparticles of both SiO2 and the assembled ZnO NP, can be seen clearly

• involved clay [12][19][20]. Interestingly, the heterostructures described here exhibit advantages, such as a larger specific surface area, over related materials prepared by the direct attachment of metal oxide NP to the clay without incorporation of silica NP [22]. Moreover, the investigation on the

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

• was probably made too hastily based on our current knowledge of the LTCC material. We recently reported on an LTCC package that was flip-chip bonded to a complementary metal-oxide semiconductor (CMOS) integrated circuit (IC) chip to form a LoCMOS system [23]. It was designed with a CMOS chip for

Filled and empty states of Zn-TPP films deposited on Fe(001)-p(1×1)O

• Gianlorenzo Bussetti,
• Alberto Calloni,
• Rossella Yivlialin,
• Andrea Picone,
• Federico Bottegoni and
• Marco Finazzi

Beilstein J. Nanotechnol. 2016, 7, 1527–1531, doi:10.3762/bjnano.7.146

• metal oxide, namely an Fe(001)-p(1×1)O surface. The filled and empty electronic states were measured by means of UV photoemission and inverse photoemission spectroscopy on a single monolayer and a 20 monolayer thick film. The ionization energy and the electron affinity of the organic film were deduced

• and the interface dipole was determined and compared with data available in the literature. Keywords: inverse photoemission; metal-oxide film; OMBE; porphyrin; Introduction Thin organic films can be realized by depositing single molecules on surfaces, which is the first step for the so-called bottom

• ultrathin metal oxide (MO) films [9]. Here, a single layer of oxygen atoms can decouple, or at least reduce, the interaction between the grown molecules and the buried metal substrate. The mechanisms involved during the film growth on the oxide layer are still under debate. In this respect, we have recently

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

• light, which convey important information for the quantitative analysis of nitrogen dioxide. Keywords: dynamic gas sensing; indium oxide; nitrogen dioxide; pulsed UV light; UV-activated metal oxide; Introduction Technological barriers related to sensor performance and power consumption are currently

• known to be a source of acid rain and fog, to catalyse the formation of ozone and to trigger diseases of the respiratory system in humans [4][5]. The combustion of transportation fuels is responsible for over 50% of the anthropogenic emissions of nitrogen oxides. Some metal oxide semiconductors have

• been found to be highly sensitive to nitrogen dioxide levels in air [6][7] and there are commercially available metal oxide NO2 sensors [8]. In particular, many authors have reported nanostructured indium oxide as a promising material for the sensitive detection of nitrogen dioxide at trace levels in

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

• ][6]. During the last decades, different types of sensors were fabricated for environmental and health monitoring. Among the different detection systems, chemical sensors based on metal oxide nanomaterials are highly demanded because of their high sensitivity, small size, low cost and low power

• consumption [7][8]. Metal oxide sensors can detect ethanol and acetone only at high operating temperatures (≥300 °C) [7][9][10]. ZnO is a extensively studied and inspiring material due to its unique properties, namely the wide bandgap and large exciton binding energy [11]. Most of the literature is focused on

• have been improved because of the high surface area of RGO and nanostructured ZnO, as well as due to the ability of RGO to enhance the transport of charge carriers in the structure. Finally, incorporation of RGO into the metal oxide nanomaterials is a promising strategy in the detection of VOCs for

Metal oxide-graphene field-effect transistor: interface trap density extraction model

• Faraz Najam,
• Kah Cheong Lau,
• Cheng Siong Lim,
• Yun Seop Yu and
• Michael Loong Peng Tan

Beilstein J. Nanotechnol. 2016, 7, 1368–1376, doi:10.3762/bjnano.7.128

• interface trap states detrimentally affects the device drain current–gate voltage relationship Ids–Vgs. At the moment, there is no analytical method available to extract the interface trap distribution of metal-oxide-graphene field effect transistor (MOGFET) devices. The model presented here extracts the

• that can later be used in drain current model is highlighted as a major advantage of the model. Keywords: drain current compact model; interface trap distribution; metal-oxide-graphene field-effect transistor (MOGFET); surface potential; Introduction Graphene has recently attracted a lot of attention

• film resulting in the presence of trap states; Dit states (cm−2·eV−1) at the interface between the dielectric layer and graphene channel [2][3]. These trap states trap mobile carriers degrading the gate field modulation effect, thereby resulting in degraded surface potential. Popular metal-oxide

Ammonia gas sensors based on In₂O₃/PANI hetero-nanofibers operating at room temperature

• Qingxin Nie,
• Zengyuan Pang,
• Hangyi Lu,
• Yibing Cai and
• Qufu Wei

Beilstein J. Nanotechnol. 2016, 7, 1312–1321, doi:10.3762/bjnano.7.122

• even death [5][6][7]. So, there is an urgent need to develop a kind of gas sensor with high sensitivity and selectivity to detect NH3 at room temperature. Metal oxide semiconductors can be applied as sensing materials for monitoring NH3. Ammonia sensors based on In2O3 [8], TiO2 [9], SnO2 [10], ZnO [11

• commonly used conducting polymers has received considerable attention. However, the sensitivity of PANI remains to be improved [21][22]. To conquer the limitations mentioned above, the combination of metal oxide and conducting polymers have been developed as an effective way to achieve enhanced performance

Improved lithium-ion battery anode capacity with a network of easily fabricated spindle-like carbon nanofibers

• Mengting Liu,
• Wenhe Xie,
• Lili Gu,
• Tianfeng Qin,
• Xiaoyi Hou and
• Deyan He

Beilstein J. Nanotechnol. 2016, 7, 1289–1295, doi:10.3762/bjnano.7.120

• the high theoretical capacity and enhanced reaction kinetics of MnO, the improved conductivity of carbon anchored with N, and the robust structural endurance, effectively alleviating the problem of volume change. The work provides another credible work supporting that the transition metal oxide based

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr₂FeMoO_6−x nanopowders formed by the citrate–gel method

• Marta Yarmolich,
• Nikolai Kalanda,
• Sergey Demyanov,
• Herman Terryn,
• Jon Ustarroz,
• Maksim Silibin and
• Gennadii Gorokh

Beilstein J. Nanotechnol. 2016, 7, 1202–1207, doi:10.3762/bjnano.7.111

• nm and a superstructural ordering of iron and molybdenum cations of 88%. Keywords: magnetic materials; microstructure; nanoparticles; phase transformation; sol–gel preparation; Introduction Due to their unique and extremely important magneto-transport and magnetic properties [1][2], metal oxide

An ellipsometric approach towards the description of inhomogeneous polymer-based Langmuir layers

• Falko O. Rottke,
• Burkhard Schulz,
• Klaus Richau,
• Karl Kratz and
• Andreas Lendlein

Beilstein J. Nanotechnol. 2016, 7, 1156–1165, doi:10.3762/bjnano.7.107

• dielectric properties of a film and its thickness [1]. Like applications of thin films, the uses of ellipsometry are widespread, ranging from the characterization of metal-oxide layers in semiconductors, over the characterization of functional organic films, to investigations of biologically relevant

Photocurrent generation in carbon nanotube/cubic-phase HfO₂ nanoparticle hybrid nanocomposites

• Protima Rauwel,
• Augustinas Galeckas,
• Martin Salumaa,
• Frédérique Ducroquet and
• Erwan Rauwel

Beilstein J. Nanotechnol. 2016, 7, 1075–1085, doi:10.3762/bjnano.7.101

• gap of 5.7 eV [14][15]. HfO2 has already been integrated in numerous technologies and has been chosen for the replacement of Si-based gate oxides in advanced complementary metal-oxide semiconductors (CMOS) [16]. Many efforts have been made towards the stabilization of the cubic phase of HfO2 due to

• surface of the nanoparticles on forming esters [25]. Moreover, π–π stacking has also proven effective in attaching inorganic metal oxide nanoparticles to the surface of nonfunctionalized nanotubes. In this approach, the aromatic ring of the CNT is directly connected to the benzyl ring of the inorganic

NO gas sensing at room temperature using single titanium oxide nanodot sensors created by atomic force microscopy nanolithography

• Li-Yang Hong and
• Heh-Nan Lin

Beilstein J. Nanotechnol. 2016, 7, 1044–1051, doi:10.3762/bjnano.7.97

• potential application of single metal oxide NDs for gas sensing with a performance that is comparable with that of metal oxide nanowire gas sensors. Keywords: atomic force microscopy nanolithography; photo-activation; photo-recovery; resistive NO gas sensor; titanium oxide nanodot sensor; Introduction In

• recent years, gas sensors have been widely used in a variety of fields, such as medical diagnosis [1][2], environmental monitoring [3] and combustion emission control [4]. Among all types of gas sensors, resistor-type gas sensors based on semiconducting metal oxide nanomaterials [5][6][7][8] are more

• attractive than conventional devices [9]. The advantages include high sensitivity, high stability, fast detection and recovery, low power consumption, relatively low cost, and small size [9][10]. These advantages enable semiconducting metal oxide sensors to be implemented on integrated circuits for portable

Development of highly faceted reduced graphene oxide-coated copper oxide and copper nanoparticles on a copper foil surface

• Rebeca Ortega-Amaya,
• Yasuhiro Matsumoto,
• Andrés M. Espinoza-Rivas,
• Manuel A. Pérez-Guzmán and
• Mauricio Ortega-López

Beilstein J. Nanotechnol. 2016, 7, 1010–1017, doi:10.3762/bjnano.7.93

• or metal oxide nanoparticles [11]. In particular, rGO–Cu core–shell nanostructures have been synthesized by CVD [12][13], hydrothermal synthesis [14] and pyrolysis of an organocopper compound [15][16][17]. In a previous work, the authors reported the effective reduction of chemically exfoliated GO

Microscopic characterization of Fe nanoparticles formed on SrTiO₃(001) and SrTiO₃(110) surfaces

• Miyoko Tanaka

Beilstein J. Nanotechnol. 2016, 7, 817–824, doi:10.3762/bjnano.7.73

• of the metal–oxide interface, the metal, and the oxide, respectively, the metal is expected to form 3D aggregates (Volmer–Weber growth mode) [50]. From the previously reported surface free energies per unit area of the crystal facets [51][52], Equation 1 is supposed to hold well for the growth of a

• that interface matching is less important in this case. Kamaratos et al. reported that no iron oxidation at the metal–oxide interface was indicated in their adsorption study of Fe on the STO(001) surfaces [46]. This may explain the priority of nanoparticles to surface energies than interface matching

Fabrication and properties of luminescence polymer composites with erbium/ytterbium oxides and gold nanoparticles

• Julia A. Burunkova,
• Ihor Yu. Denisiuk,
• Dmitri I. Zhuk,
• Lajos Daroczi,
• Attila Csik,
• István Csarnovics and
• Sándor Kokenyesi

Beilstein J. Nanotechnol. 2016, 7, 630–636, doi:10.3762/bjnano.7.55

• telecommunication window at 1.54 µm, as well as for efficient optical amplification elements. For example, silicon oxides (SiOx) and silicon nitrides (SiNx) doped with Er can be integrated in a metal-oxide-semiconductor structure and used as infrared light sources or amplifiers in telecommunication systems [1

Bacteriorhodopsin–ZnO hybrid as a potential sensing element for low-temperature detection of ethanol vapour

• Saurav Kumar,
• Sudeshna Bagchi,
• Senthil Prasad,
• Anupma Sharma,
• Ritesh Kumar,
• Rishemjit Kaur,
• Jagvir Singh and
• Amol P. Bhondekar

Beilstein J. Nanotechnol. 2016, 7, 501–510, doi:10.3762/bjnano.7.44

• inorganic materials in order to overcome the intrinsic limitations of ZnO (i.e., poor selectivity and high working temperature) [31][32][33]. Metal/metal oxide–bR hybrids were previously reported for bio-optoelectronic and solar cell applications [7][20]. However, a hybrid structure employing ZnO and bR

Hydration of magnesia cubes: a helium ion microscopy study

• Ruth Schwaiger,
• Johannes Schneider,
• Gilles R. Bourret and
• Oliver Diwald

Beilstein J. Nanotechnol. 2016, 7, 302–309, doi:10.3762/bjnano.7.28

• thin solids such as lamellar hydroxides or hydroxide shells on top of the metal oxide cubic particles [21]. Because of its high resolution and surface sensitivity, HIM is particularly interesting for the characterization of reactive nanomaterials such as MgO, for which the unintended contact to

• , and environmental conditions that are experienced by particles in the different studies. This study describes the stability and transformation behavior of cubic metal oxide structures after their exposure to water in gaseous and liquid form. The influence of contact with water on the stability of

• morphologically well-defined MgO particle systems was investigated. We observed unexpected transformations ranging from swelling of the metal oxide nanostructure core to dissolution–recrystallization steps that give rise to the formation of hydroxides with entirely different microstructures [21]. Experimental All

Evaluation of gas-sensing properties of ZnO nanostructures electrochemically doped with Au nanophases

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

Beilstein J. Nanotechnol. 2016, 7, 22–31, doi:10.3762/bjnano.7.3

• . In this context, chemical gas sensors have a deep impact on human security, medical prevention and diagnosis, monitoring and detection of polluting and toxic substances [1]. Specifically, nowadays metal oxide semiconductors (MOS), such as WO3, SnO2, In2O3 and TiO2 [2], have been largely used as

Sonochemical co-deposition of antibacterial nanoparticles and dyes on textiles

• Ilana Perelshtein,
• Anat Lipovsky,
• Nina Perkas,
• Tzanko Tzanov and
• Aharon Gedanken

Beilstein J. Nanotechnol. 2016, 7, 1–8, doi:10.3762/bjnano.7.1

• wide range of applications. Here, we report for the first time on the simultaneous sonochemical dyeing and coating of textiles with antibacterial metal oxide (MO) nanoparticles. In this one-step process the antibacterial nanoparticles are synthesized in situ and deposited together with dye

• antibacterial properties. The color fastness was evaluated by immersing the coated/dyed cotton in water and monitoring the absorbance of the colored fabric. Two major issues were solved in this research: i) the antibacterial activity of the metal oxide (MO) NPs was maintained while deposited simultaneously with

• the dye, ii) a stable sonochemical coloration of cotton fabric was achieved in spite of the rich literature on the use of ultrasonic waves for bleaching color from textiles [21][22][23][24]. Experimental Water-based synthesis of metal oxide (MO) NPs and their simultaneous coating with a dye on cotton

Large area scanning probe microscope in ultra-high vacuum demonstrated for electrostatic force measurements on high-voltage devices

• Urs Gysin,
• Thilo Glatzel,
• Thomas Schmölzer,
• Adolf Schöner,
• Sergey Reshanov,
• Holger Bartolf and
• Ernst Meyer

Beilstein J. Nanotechnol. 2015, 6, 2485–2497, doi:10.3762/bjnano.6.258

• . The grain seems to be covered by a residual layer partly smearing out the CPD contrast. The PtIr-coated tip is most probably contaminated by a metal oxide cluster (CuO or CrO) due to slight tip–sample contacts before the measurements, such that the work function is around Φtip = 5 eV [40]. Also in

Blue and white light emission from zinc oxide nanoforests

• Nafisa Noor,
• Luca Lucera,
• Thomas Capuano,
• Venkata Manthina,
• Alexander G. Agrios,
• Helena Silva and
• Ali Gokirmak

Beilstein J. Nanotechnol. 2015, 6, 2463–2469, doi:10.3762/bjnano.6.255

• nanostructures [2], nanoscale electronic devices and large area electronics has led to significant research efforts in metal-oxide semiconductors such as ZnO. ZnO is a common, low-cost, antibacterial [3] material that forms various nanostructures depending on the process conditions. It is a direct and wide band

Green and energy-efficient methods for the production of metallic nanoparticles

• Mitra Naghdi,
• Mehrdad Taheran,
• Satinder K. Brar,
• M. Verma,
• R. Y. Surampalli and
• J. R. Valero

Beilstein J. Nanotechnol. 2015, 6, 2354–2376, doi:10.3762/bjnano.6.243

Electrochemical coating of dental implants with anodic porous titania for enhanced osteointegration

• Amirreza Shayganpour,
• Alberto Rebaudi,
• Pierpaolo Cortella,
• Alberto Diaspro and
• Marco Salerno

Beilstein J. Nanotechnol. 2015, 6, 2183–2192, doi:10.3762/bjnano.6.224

• , traces of additional chemical elements are present, such as carbon, ascribed to organic contamination during packaging, and, to a lower extent, oxygen, ascribed to native metal oxide on the surface. Contamination of rhodium also appears at very low levels (estimated ≈0.8 at %), which was the same for

Selective porous gates made from colloidal silica nanoparticles

• Roberto Nisticò,
• Paola Avetta,
• Paola Calza,
• Debora Fabbri,
• Giuliana Magnacca and
• Dominique Scalarone

Beilstein J. Nanotechnol. 2015, 6, 2105–2112, doi:10.3762/bjnano.6.215

• 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

Distribution of Pd clusters on ultrathin, epitaxial TiO_x films on Pt₃Ti(111)

• Christian Breinlich,
• Maria Buchholz,
• Marco Moors,
• Tobias Pertram,
• Conrad Becker and
• Klaus Wandelt

Beilstein J. Nanotechnol. 2015, 6, 2007–2014, doi:10.3762/bjnano.6.204

• spillover to the metal particles [1][2]. Thus, the investigation of the properties of supported metal clusters and the influence of the metal-oxide interfaces are of great interest. In particular, titanium oxides are often correlated with the so-called strong metal support interaction (SMSI) effect, which

• describes the influence of a transition metal oxide support on noble metal clusters yielding novel catalytic properties [1][2][3][4][5][6][7]. In order to understand this effect, well-defined model systems are needed. “Well-defined” refers to both the clusters and the supporting substrate, as exemplified in