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Search for "nanodots" in Full Text gives 48 result(s) in Beilstein Journal of Nanotechnology.
Heterostuctures of 4-(chloromethyl)phenyltrichlorosilane and 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine prepared on Si(111) using particle lithography: Nanoscale characterization of the main steps of nanopatterning
Beilstein J. Nanotechnol. 2018, 9, 1211–1219, doi:10.3762/bjnano.9.112
- or bicyclohexyl (BCH) for a selected amount of time to generate nanodots of CMPS (Figure 1c). Nanodots of CMPS formed selectively within the confined sites of nanoholes. The samples containing the CMPS nanodots were then refluxed in a solution of H2TPyP in ethanol and chloroform for 48 h to attach
- was chosen to passivate the silicon surface and to serve as a resist layer to accomplish spatial selectivity for surface reactions. The uncovered sites of Si(111) within the nanoholes expose hydroxyl groups for binding organosilanes such as CMPS. Preparation of CMPS nanodots The samples with nanoholes
- of Si(111) within an OTS resist were immersed in a solution of CMPS a to generate nanodots as reactive sites for further reaction steps with porphyrins. An example of the results for preparing nanodots of CMPS is shown in Figure 3. Nanodots grown in a solution of CMPS in BCH at 20 °C are shown in
Field-controlled ultrafast magnetization dynamics in two-dimensional nanoscale ferromagnetic antidot arrays
Beilstein J. Nanotechnol. 2018, 9, 1123–1134, doi:10.3762/bjnano.9.104
- magnetic metamaterials, known as magnonic crystals (MCs), which have great potential for technological applications and fundamental research [1][2]. Investigation and tailoring of the magnetization dynamics in ferromagnetic nanodots [3][4], nanowires [5] and antidots [6][7][8] have fuelled considerable
Co-reductive fabrication of carbon nanodots with high quantum yield for bioimaging of bacteria
Beilstein J. Nanotechnol. 2018, 9, 137–145, doi:10.3762/bjnano.9.16
- , Ireland School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK 10.3762/bjnano.9.16 Abstract A simple and straightforward synthetic approach for carbon nanodots (C-dots) is proposed. The strategy is based on a one-step hydrothermal chemical reduction with thiourea and urea
- in bioimaging thanks to their low cytotoxicity. Keywords: bioimaging; carbon nanodots; collaborative reduction; hydrothermal; Introduction Over recent years, carbon nanomaterials have remarkably influenced the growth of a wide range of fields, including electronics, photonics, energy, catalysis and
- medicine. Within this class of materials, carbon nanodots (C-dots) are deemed a major breakthrough for the development of fluorescent nanomaterials. They are a promising alternative to fluorescent inorganic semiconductor nanocrystals and organic dyes due to their chemical stability, good dispersibility in
Luminescent supramolecular hydrogels from a tripeptide and nitrogen-doped carbon nanodots
Beilstein J. Nanotechnol. 2017, 8, 1553–1562, doi:10.3762/bjnano.8.157
- are formed from unprotected D,L-tripeptides bearing the Phe-Phe motif and nitrogen-doped carbon nanodots (NCNDs) are promising materials for biological use. In this work, they were combined to obtain luminescent, supramolecular hydrogels at physiological conditions. The self-assembly of a tripeptide
- with narrower diameter distribution. Keywords: carbon nanodots; composites; hydrogels; nanomaterials; peptide self-assembly; Introduction Carbon nanodots (CNDs) are quasi-spherical nanoparticles with a diameter less than 10 nm. They are a very interesting class of nanocarbons because of their
- long term, a supramolecular hydrogel composed of a peptide and luminescent nanodots could be valuable for tissue regeneration based on a bioactive scaffold that can be also visualized in vivo by fluorescence microscopy. Alternatively, other potential applications could be developed in the future for
A top-down approach for fabricating three-dimensional closed hollow nanostructures with permeable thin metal walls
Beilstein J. Nanotechnol. 2017, 8, 1231–1237, doi:10.3762/bjnano.8.124
- (Microchem Corp.) was spun at 3000 rpm on a 100 nm thick Al film, which was previously deposited on a Si substrate, and soft-baked at 110 °C for 1 min on a hot plate. Next, a 600 nm period square lattice of circular solid nanodots was written in the resist film by electron beam lithography (EBL) at 50 kV and
Obtaining and doping of InAs-QD/GaAs(001) nanostructures by ion beam sputtering
Beilstein J. Nanotechnol. 2017, 8, 12–20, doi:10.3762/bjnano.8.2
- it would be necessary to increase the current even further in order to obtain even denser array of nanodots. However, physical and technical reasons impede the realization of this idea. The physical reason consists in the increase in the dimensions of quantum dots and their dispersion, as it was
Nano- and microstructured materials for in vitro studies of the physiology of vascular cells
Beilstein J. Nanotechnol. 2016, 7, 1620–1641, doi:10.3762/bjnano.7.155
- advantage of optical superresolution, with which it is possible to go below the light diffraction limit, to perform photolithography with nanometer resolution. For example, using nano-antennas it was possible, by two-photon polymerization, to produce photoresist nanodots with diameters below 30 nm [64]. In
Fast diffusion of silver in TiO2 nanotube arrays
Beilstein J. Nanotechnol. 2016, 7, 1129–1140, doi:10.3762/bjnano.7.105
- nanotube arrays and observed the formation of Ag nanodots on the top surface of the TiO2 nanotube arrays. However, they did not examine and discuss whether there exist Ag nanodots inside the TiO2 nanotubes or on the surface of the TiO2 nanotubes. The microstructures of TiO2-based materials depend on the
Formation of pure Cu nanocrystals upon post-growth annealing of Cu–C material obtained from focused electron beam induced deposition: comparison of different methods
Beilstein J. Nanotechnol. 2015, 6, 1508–1517, doi:10.3762/bjnano.6.156
- annealing of Cu–C FEBID material from Cu(II) and Cu(I) precursors with respect to nanostructural changes and conductivity showing the potential of fabricating pure copper nanodots, from the as-grown amorphous Cu–C deposit. The thermal energy input favors the migration of Cu atoms to coalesce to pure Cu
Polymer blend lithography for metal films: large-area patterning with over 1 billion holes/inch2
Beilstein J. Nanotechnol. 2015, 6, 1205–1211, doi:10.3762/bjnano.6.123
- of both ordered gold or silver nanodot arrays and ordered nanohole arrays in a gold film [17][18]. Lithographic methods incorporated with self-assembled block copolymers are also promising ways to fabricate sub-100 nm metal nanodots or perforated films, however these processes are often complicated
Low-cost formation of bulk and localized polymer-derived carbon nanodomains from polydimethylsiloxane
Beilstein J. Nanotechnol. 2015, 6, 744–748, doi:10.3762/bjnano.6.76
- characterization of the byproduct materials are reported. We demonstrate that CVD led to bulk production of graphitic nanocrystals and single-walled carbon nanotubes while direct laser ablation may be employed for the formation of localized fluorescent nanodots. In the latter case, graphitic nanodomains and multi
- promising for the formation of carbon nanoresidues with controlled properties and in applications where high integration is desired. Keywords: carbon nanodomains; nanodots; polydimethylsiloxane; polymer-derived ceramics; Raman spectroscopy; Introduction Silicon-based polymer-derived ceramics (PDC) are of
- parameters and to verify if our methods can be a low-cost solution for the tunable formation of carbon nanodots. Diagram of the custom-made atmospheric pressure CVD reactor. Comparison of Raman spectra: pristine PDMS, carbon nanotubes (shiny domains) and graphite nanocrystals (dark domains). Raman
High speed e-beam lithography for gold nanoarray fabrication and use in nanotechnology
Beilstein J. Nanotechnol. 2014, 5, 1918–1925, doi:10.3762/bjnano.5.202
- layout writing. Below, we describe each of the proposed method for nanoarray fabrication (Figure 1b) and discuss their performance in the next section. In the conventional method, we design a grating of 5 nm by 5 nm nanodots equivalent to the beam step size (BSS) of the machine. Thus, each dot is
- obtained by aligning several layouts. The last method called “sequence method” that we introduce here for the gold nanodots array fabrication defines shapes as a series of lines and jumps with either beam “on” or “off” (See Supporting Information File 1 for the detailed code). In this way it is possible to
- ) and the “sequence” (Figure 2d) techniques. We didn’t notice significant difference in the fabricated gold nanoarrays. The dose per dot, corresponding to optimized nanodots (meaning less than 5% of missing dots and dots size below 15 nm), is similar for all the studied techniques: 3–4 fC/dot
Silicon and germanium nanocrystals: properties and characterization
Beilstein J. Nanotechnol. 2014, 5, 1787–1794, doi:10.3762/bjnano.5.189
- perspective, group-IV nanocrystals are usually divided into free-standing and embedded. The first class of models mimics the NCs grown, for example, by using plasma methods; the second class comprises nanocrystals embedded in another material, as for example Si nanodots in SiO2, or in a different phase of the
- same material, for example crystalline Si nanodots in amorphous Si. Free-standing nanocrystals in vacuum can be modeled by using real-space boundary conditions, i.e., requiring the wavefunction to vanish far from the nanocrystal. An alternative approach is to impose periodic boundary conditions
Synthesis of hydrophobic photoluminescent carbon nanodots by using L-tyrosine and citric acid through a thermal oxidation route
Beilstein J. Nanotechnol. 2014, 5, 1513–1522, doi:10.3762/bjnano.5.164
- Venkatesh Gude Department of Chemistry, Assam University-Silchar, Assam, 788011, India 10.3762/bjnano.5.164 Abstract Hydrophobic photoluminescent carbon nanodots (CNDs) were fabricated by using citric acid and L-tyrosine precursor molecules through a simple, facile thermal oxidation process in
- molecule detection, energy transfer [1]. A special form of carbon (smaller than 10 nm in size) exhibiting fascinating properties are carbon nanodots (CNDs), which are different in their properties from zero-band gap graphene, diamond, and fullerene. Carbon nanodots (CNDs) exhibit properties such as
- dissolved in dry acetone and filtered in order to separate undissolved components such as unreacted reactants and condensation products. The obtained dark brown filtrate was subjected to rotary evaporation in order to produce tyrosine-passivated carbon nanodots (TCNDs) at 220 °C for 30 min, hereafter
Physics, chemistry and biology of functional nanostructures II
Beilstein J. Nanotechnol. 2014, 5, 1218–1219, doi:10.3762/bjnano.5.134
- resolved by the introduction of self-assembled magnetic nanodots on the MgB2 surface, which gives rise to a new hybrid material with the desired properties [2]. The conceptual idea of this Thematic Series saw the light of day at the international conference bearing the “NANO” logo, which took place in
Nanostructure sensitization of transition metal oxides for visible-light photocatalysis
Beilstein J. Nanotechnol. 2014, 5, 696–710, doi:10.3762/bjnano.5.82
- for more detailed information [106]. Carbon nanodots are a new class of carbon nanomaterials and consist of discrete, quasipherical nanoparticles with sizes below 10 nm [107][108][109][110]. Since they have been reported on in 2004 for the first time [111], carbon dots have gradually become an
- important member in the nanocarbon family due to their benign, abundant and low-cost nature. As carbonaceous quantum dots, carbon nanodots display PL behavior dependent on their size and the excitation wavelength. In addition, carbon dots are also characterized by water solubility, chemical inertness and
- resistance to photobleaching. Up to now, many methods [112][113][114][115][116][117][118][119][120][121][122][123][124][125][126][127] are available for the fabrication of carbon nanodots, for instance, the electrochemical method, the microwave method, the ultrasonic method, the hydrothermal method. Due to
Synthesis of embedded Au nanostructures by ion irradiation: influence of ion induced viscous flow and sputtering
Beilstein J. Nanotechnol. 2014, 5, 105–110, doi:10.3762/bjnano.5.10
- surface. As we observed in our previous report [10], in which the well-ordered nanodots with an average size of 30 nm were created on the surface and were partially buried in the glass substrate after irradiation with a fluence of 1 × 1016 ions/cm2. In the present study, the average size of nanoparticle
Guided immobilisation of single gold nanoparticles by chemical electron beam lithography
Beilstein J. Nanotechnol. 2013, 4, 336–344, doi:10.3762/bjnano.4.39
- order to overcome this threshold and to facilitate the processing, alternative approaches have been developed, which utilise the self-assembly capabilities of chemically tailored metal nanoparticles. Amongst others, Enderle et al. demonstrated very recently the formation of gold nanodots by self
Plasmonic oligomers in cylindrical vector light beams
Beilstein J. Nanotechnol. 2013, 4, 57–65, doi:10.3762/bjnano.4.6
- optical microscopes. Oligomer rings composed of gold nanodots, SEM images on the left, confocal luminescence images under azimuthally polarized illumination on the right. Lower row: Simulations based on a planar convolution of the exciting light field with the structure geometry. The left image depicts
The memory effect of nanoscale memristors investigated by conducting scanning probe microscopy methods
Beilstein J. Nanotechnol. 2012, 3, 722–730, doi:10.3762/bjnano.3.82
- at an appropriate Vtip with the tip of the conducting scanning force microscope (C-SFM). (a) Topographic image (20 μm × 20 μm) of a 24 nm thick LSMO thin film. A certain concentration of outcropped insulating (La,Sr)xOy (LSO) nanodots (50–80 nm high) are used as an in situ reference for topographic
Focused electron beam induced deposition: A perspective
Beilstein J. Nanotechnol. 2012, 3, 597–619, doi:10.3762/bjnano.3.70
Parallel- and serial-contact electrochemical metallization of monolayer nanopatterns: A versatile synthetic tool en route to bottom-up assembly of electric nanocircuits
Beilstein J. Nanotechnol. 2012, 3, 134–143, doi:10.3762/bjnano.3.14
- –2 nm. On small dotlike template sites, this metal growth mode yields discrete Ag nanodots (Figure 2 and Figure 3, top row), whereas continuous Ag nanowires with a bamboolike structure of higher and lower metal features are formed on narrow template lines (Figure 3, middle row left). Identical
- silver nanodots fabricated by this serial CET process are similar to those produced in the parallel CET mode (Figure 2 and Figure 3); however, the serial process offers the option of precise control over the generation of discrete nanoparticles at isolated sites within each OTSeo template line, in
- nanodots and nanowires, may be achieved by using metal-film stamps in the parallel-metallization mode (Figure 2 and Figure 3), serial generation of metal/monolayer nanoobjects occupying only a limited portion of the total area of the respective monolayer-template features (such as the nanodots in Figure 5
Self-assembly of octadecyltrichlorosilane: Surface structures formed using different protocols of particle lithography
Beilstein J. Nanotechnol. 2012, 3, 114–122, doi:10.3762/bjnano.3.12
- protocols of particle lithography combined with either vapor deposition, immersion, or contact printing. Changing the physical approaches for applying molecules to masked surfaces produced OTS nanostructures with different shapes and heights. Ring nanostructures, nanodots and uncovered pores of OTS were
- -shaped nanostructures were produced by using latex-particle lithography with immersion, as shown in Figure 5 with wide-area and zoom-in topography views. The long-range periodicity of the array of nanodots is shown with an FFT within the inset of Figure 5a. The surface density of the nanodots is
- approximately 3.3 × 109 nanostructures/cm2, showing ~120 nanopatterns within the 2.5 × 2.5 µm2 frame shown in Figure 5b. The heights of the nanodots measure 0.5 ± 0.3 nm. Immersion of a masked substrate in a solvent is the most common approach for preparing films of OTS, and has produced the most consistent
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