Search results
Search for "nanopore" in Full Text gives 34 result(s) in Beilstein Journal of Nanotechnology.
Recent progress in actuation technologies of micro/nanorobots
Beilstein J. Nanotechnol. 2021, 12, 756–765, doi:10.3762/bjnano.12.59
- this, the new microrobot is expected to be used in targeted drug delivery and other biomedical fields. Si et al. [27] proposed a theoretical concept of a nanorobot consisting of a nanoparticle and four single-stranded DNAs placed on a quad-nanopore device for motion control. When an electric field is
- integrated into a solid-state nanopore platform to capture and sense target molecules. This shows that the application prospects of nanorobots are broad. However, the difficulty of how to achieve the accurate control of direction and speed of motion cannot be ignored. Qu et al. [28], who also wanted to study
A review of defect engineering, ion implantation, and nanofabrication using the helium ion microscope
Beilstein J. Nanotechnol. 2021, 12, 633–664, doi:10.3762/bjnano.12.52
- biomolecules by optical means, as opposed to having to rely on the conventional ionic current method. Nanopore fabrication using the HIM is discussed in more detail in Section 5. The HIM has also been used to tune the optical properties of quantum well structures [61]. In this work, epitaxially grown InGaAs
Bio-imaging with the helium-ion microscope: A review
Beilstein J. Nanotechnol. 2021, 12, 1–23, doi:10.3762/bjnano.12.1
Out-of-plane surface patterning by subsurface processing of polymer substrates with focused ion beams
Beilstein J. Nanotechnol. 2020, 11, 1693–1703, doi:10.3762/bjnano.11.151
- ][16]. It has also been demonstrated that it acts as a type of ion-beam resist in the fabrication of micro- and nanopore membranes and templates for nanowires by chemical etching of through-holes along ion tracks produced by high-energy ions [17][18]. In contrast to PMMA and PC polymers, PDMS is a
Fabrication of nano/microstructures for SERS substrates using an electrochemical method
Beilstein J. Nanotechnol. 2020, 11, 1568–1576, doi:10.3762/bjnano.11.139
- electrochemical method, three-dimensional arrayed nanopore structures are machined onto a Mg surface. The structured Mg surface is coated with a thin gold (Au) film, which is used as a surface-enhanced Raman scattering (SERS) substrate. A rhodamine 6G (R6G) probe molecule is used as the detection agent for the
- . Additionally, a 10−6 mol·L−1 solution of lysozyme was successfully detected using the Mg–Au nanopore substrates. Our low-cost method is reproducible, homogeneous, and suitable for the fabrication of SERS substrates. Keywords: electrochemical machining; gold (Au); lysozyme detection; magnesium (Mg); micro
- /nanopore; nano/microstructures; SERS substrate; Introduction Surface-enhanced Raman spectroscopy (SERS) can be used to detect biomolecules [1][2][3], explosives [4][5][6], and pesticide residues [7][8][9]. Plasmonic metal nanostructures are often used as SERS substrates to increase the molecule-specific
Electrochemical nanostructuring of (111) oriented GaAs crystals: from porous structures to nanowires
Beilstein J. Nanotechnol. 2020, 11, 966–975, doi:10.3762/bjnano.11.81
- within the nanopore wall at the interface with the electrolyte during anodization [23], and it equals ca. 2 × SCR [17]. As a result, for higher carrier concentrations in the GaAs wafer thinner nanowires are obtained. The density of the nanowires is quite homogeneous on a large scale (Figure 4C), while
Effect of Ag loading position on the photocatalytic performance of TiO2 nanocolumn arrays
Beilstein J. Nanotechnol. 2020, 11, 717–728, doi:10.3762/bjnano.11.59
- deposition in AFT1, no obvious nanoparticles can be observed in the TNC array, and not much Ag aggregation is present around the nanopore marked with the red circle. This implies that Ag can still enter the nanocolumn easily. In contrast, Ag nanoparticles can be clearly seen on the inner wall of the TNC of
- having the thickest layer of Ag (AFT3), a large amount of Ag accumulation can be observed around the nanopore marked with the yellow circle in Figure 3f, which closes the nanopore and hinders excessive Ag deposition in the TNC. Comparing the areas marked with the red circles in Figure 3e and 3f, it
An advanced structural characterization of templated meso-macroporous carbon monoliths by small- and wide-angle scattering techniques
Beilstein J. Nanotechnol. 2020, 11, 310–322, doi:10.3762/bjnano.11.23
- mesoporosity of these monolithic carbon materials was studied by the sorption behavior of a relatively large organic molecule (p-xylene) in comparison to typical gas adsorbates (Ar). In addition, to obtain a detailed view on the nanopore space small-angle neutron scattering (SANS) combined with in situ
- physisorption was applied, using deuterated p-xylene (DPX) as a contrast-matching agent in the neutron scattering process. The impact of the carbon precursor on the structural order on an atomic scale in terms of size and disorder of the carbon microstructure, on the nanopore structure, and on the template
- nanopore space and the building blocks surrounding the nanopores. In essence, the structure of “non-graphitic carbon materials” consists of hexagonal graphene layers that are stacked in a parallel way but do not possess 3D long-range crystallographic order. This structure is referred to as “turbostratic
Molecular architectonics of DNA for functional nanoarchitectures
Beilstein J. Nanotechnol. 2020, 11, 124–140, doi:10.3762/bjnano.11.11
- ligated by DNA via direct amidation, and the covalent attachment allowed the insertion of an array of porphyrin segments along the nucleotide sequence. Recently, a transmembrane lipid bilayer nanopore comprised of folded DNA became the center of attraction by mimicking natural protein pores. Howorka and
- co-workers reported the synthesis of porphyrin-conjugated DNA nanopores as a simple and effective strategy to span through the bilayer system [93]. The nanopore consisted of six hexagonally packed DNA double-helical assemblies that were preserved by double-crossover strands (Figure 8a). The two
- data (Figure 8c) showed the movement of ions through the lipid–nanopore interface via the formation of a toroidal pore. The binding of porphyrin-tethered nanopores with giant unilamellar vesicles was analyzed by confocal microscopy (Figure 8d). The inherent fluorescent signal of porphyrin showed their
Materials nanoarchitectonics at two-dimensional liquid interfaces
Beilstein J. Nanotechnol. 2019, 10, 1559–1587, doi:10.3762/bjnano.10.153
- uniform two-dimensional nanocarbon films, so-called carbon nanosheets, with ca. 10 nm thickness with dispersed nanopore structural motifs. The electrical conductivity of the transferred film was significantly increased after the thermal carbonization process. Nitrogen-doping was carried out simply by
Photoactive nanoarchitectures based on clays incorporating TiO2 and ZnO nanoparticles
Beilstein J. Nanotechnol. 2019, 10, 1140–1156, doi:10.3762/bjnano.10.114
- important to control the synthesis procedures in order to obtain the desired surface properties of the NPs, as well as suitable size and shape and nanopore characteristics in the resulting pillared layered structures. The formation of house-of-cards-like structures during the preparation of ZnO NPs in the
- nanopore structure and other surface characteristics. However, in the case of sepiolite and palygorskite, the sizes of the available nanospaces are too small for the generation of TiO2 and ZnO NPs within the nanopores [72]. In this case, mesopores, which can be ascribed to inter-fibre regions, could
Charged particle single nanometre manufacturing
Beilstein J. Nanotechnol. 2018, 9, 2855–2882, doi:10.3762/bjnano.9.266
- example, is interesting for the localisation and analysis of biomolecules. Miyazoe [91] used a conventional SEM fitted with an external reservoir for precursor injection to etch holes as small as 18 nm in diameter in a thin carbon membrane using both H2O and XeF2. Yemini [92] fabricated a nanopore array
Defect formation in multiwalled carbon nanotubes under low-energy He and Ne ion irradiation
Beilstein J. Nanotechnol. 2018, 9, 1951–1963, doi:10.3762/bjnano.9.186
- ]. For He+ irradiation of graphene, Stone–Thrower–Wales defects form preferentially [10]. For graphene, 1000 eV proved also to be the optimum energy for defect and nanopore formation at an incidence angle of 60° with respect to the surface normal and of 400–500 eV for angles closer to the surface normal
The inhibition effect of water on the purification of natural gas with nanoporous graphene membranes
Beilstein J. Nanotechnol. 2018, 9, 1906–1916, doi:10.3762/bjnano.9.182
- graphene. The membrane separation process involves CH4 + N2 mixtures with and without the addition of water. The results show that water is able to form hydrogen bonds with nitrogen atoms located in a nanopore rim. This effect causes a decrease of separation selectivity as well as a reduction of gas
- permeation. In the extreme case, when the nanopore rim contains only nitrogen atoms, water agglomerates at the center of the nanopore and effectively closes down the permeation path. The conclusions are confirmed by the analysis of stability and kinetics of hydrogen bonds. Keywords: graphene membrane
- reasons, the application of nanoporous graphene membrane deserves special attention. The separation through graphene crucially depends on the method of nanopore passivation. There are a lot of papers on graphene membranes doped with hydrogen, nitrogen or oxygen [7][8][9]. Sakaushi and Antonietti wrote an
Light extraction efficiency enhancement of flip-chip blue light-emitting diodes by anodic aluminum oxide
Beilstein J. Nanotechnol. 2018, 9, 1602–1612, doi:10.3762/bjnano.9.152
- a predominantly regular periodic nanostructure. The nanopore diameters of the three samples are approximately 73–75 nm, 77–79 nm, and 80–85 nm, and the distance between pores is approximately 15, 13, and 10 nm ± 2 nm. Figure 1a shows a relatively complete surface periodic structure; Figure 1b shows
Cathodoluminescence as a probe of the optical properties of resonant apertures in a metallic film
Beilstein J. Nanotechnol. 2018, 9, 1491–1500, doi:10.3762/bjnano.9.140
- and the subradiant, whispering gallery modes of circular grooves of various depths milled into a gold film have also been previously studied [56][57]. Symmetric and anti-symmetric modes of nanopore pairs in thin AlN/Au/AlN films [58] have been investigated using CL. Through the use of colloidal
Preparation and morphology-dependent wettability of porous alumina membranes
Beilstein J. Nanotechnol. 2018, 9, 1423–1436, doi:10.3762/bjnano.9.135
- work (type I–III) is shown. In the inset, a scheme describing non-isotropic etching of the pore walls [30] is shown. The authors of this work assume that the concentration of the electrolyte is initially higher on the surface of narrow channels (in the mouth of a nanopore, region 1). It then becomes
Nanoporous silicon nitride-based membranes of controlled pore size, shape and areal density: Fabrication as well as electrophoretic and molecular filtering characterization
Beilstein J. Nanotechnol. 2018, 9, 1390–1398, doi:10.3762/bjnano.9.131
- amorphous Si or SiN as a sacrificial layer. The size distributions of the opened SiN disks are similar to those of the Au NPs. The membranes are etched with a commercial RIE etcher at RT (cf. Figure 1f, for further details see Supporting Information File 1). The cross section of a nanopore of comparable
- obtained, respectively. Three different types of porous membranes were fabricated (Figure 2). The respective preparation parameters are given in Supporting Information File 1 (Table S1). Membranes A, B, and C were patterned with conically shaped nanopores. This nanopore shape was deduced from SEM
- membranes can be explained by modeling the membrane as a parallel connection of N nanopores (experimentally: N ≈ 107) leading to a total resistance of: where Rpore is the resistance of a single nanopore. Its value was successfully approximated by neglecting the influence of surface charges on the pore wall
Synthesis and characterization of noble metal–titania core–shell nanostructures with tunable shell thickness
Beilstein J. Nanotechnol. 2017, 8, 2083–2093, doi:10.3762/bjnano.8.208
- out using a qNano instrument (Izon Science) with tunable nanopore membranes NP100 (50–200 nm particles size range) for metal colloid measurements and NP150 (100–400 nm particle size range) for the CSNs measurements. The upper and lower cell chambers were filled with an electrolyte (PBS buffer). The
Application of visible-light photosensitization to form alkyl-radical-derived thin films on gold
Beilstein J. Nanotechnol. 2017, 8, 1863–1877, doi:10.3762/bjnano.8.187
- lateral dimensions of the nanopores indicate the actual area of contact between the particles of the surface mask and the gold substrate, which is quite a bit smaller than the periodicity. A representative cursor profile of a nanopore from the zoom-in topograph is shown in Figure 1c. A photografted alkyl
- particle lithography and the radical precursor Phth–Me. (a) Topography image acquired in air; (b) zoom-in view of hexagonally packed nanopores; (c) cursor profile across a single nanopore in (b); (d) corresponding phase image of (b). Attempted nanoshaving of the Au–Me Film on Au (111). (a) Topography image
- individual nanopore in (a); (d) cursor profile for the nanoshaved area in (b). Film of Au–NHBoc prepared on Au(111) with nanopores using particle lithography. (a) Topograph of nanopores; (b) zoom-in topography view of nanopores; (c) cursor profile for the line in (b); (d) corresponding phase image of (b). Au
Surface functionalization of 3D-printed plastics via initiated chemical vapor deposition
Beilstein J. Nanotechnol. 2017, 8, 1629–1636, doi:10.3762/bjnano.8.162
- , allowing for conformal coating on complex surfaces such as mictrotrenches [25] and nanopore membranes [26]. Since the rate of reaction in iCVD is limited by adsorption of monomer to the substrate, a lower substrate temperature results in a faster polymerization rate [24]. Thus, the thermally insulating
False positives and false negatives measure less than 0.001% in labeling ssDNA with osmium tetroxide 2,2’-bipyridine
Beilstein J. Nanotechnol. 2016, 7, 1434–1446, doi:10.3762/bjnano.7.135
- surrogate for nanopore-based DNA sequencing due to OsBp’s “perfect” label attributes. Osmylated deoxyoligos translocate unassisted and measurably slow via sub-2 nm SiN solid-state nanopores, as well as via the alpha-hemolysin (α-HL) pore. Both nanopores discriminate clearly between osmylated and intact
- properties of the degradation products via nanopore translocation can be evaluated to assure base calling quality in a DNA sequencing effort. Keywords: α-hemolysin; capillary electrophoresis; DNA sequencing; high-performance liquid chromatography; nanopores; osmium tetroxide bipyridine; osmylated oligos
- ) method [4]. Nevertheless, SBS limitations [5], and the need for single-molecule sequencing at a fast speed, low cost, and accurate base-calling has led to the exploration of nanopore-based solutions and other platforms [6][7]. Physical scientists embraced nanopore technology for a plethora of
Single pyrimidine discrimination during voltage-driven translocation of osmylated oligodeoxynucleotides via the α-hemolysin nanopore
Beilstein J. Nanotechnol. 2016, 7, 91–101, doi:10.3762/bjnano.7.11
- Yun Ding Anastassia Kanavarioti Chemistry Department, University of Utah, Salt Lake City, UT, USA Yenos Analytical LLC, El Dorado Hills, CA, USA 10.3762/bjnano.7.11 Abstract The influence of an electric field on an isolated channel or nanopore separating two compartments filled with electrolytes
- produces a constant ion flux through the pore. Nucleic acids added to one compartment traverse the pore, and modulate the current in a sequence-dependent manner. While translocation is faster than detection, the α-hemolysin nanopore (α-HL) successfully senses base modifications in ssDNA immobilized within
- the pore. With the assistance of a processing enzyme to slow down translocation, nanopore-based DNA sequencing is now a commercially available platform. However, accurate base calling is challenging because α-HL senses a sequence, and not a single nucleotide. Osmylated DNA was recently proposed as a
Growth and morphological analysis of segmented AuAg alloy nanowires created by pulsed electrodeposition in ion-track etched membranes
Beilstein J. Nanotechnol. 2015, 6, 1272–1280, doi:10.3762/bjnano.6.131
- nanopore membrane with 109 pores/cm2 and sputtered Au on the bottom membrane side. The green curve in Figure 1b corresponds to a solution containing 50 mM KAuCN2 and 20 mM KAgCN2. (c) Three representative EDX spectra of bundles of nanowires corresponding to different arrays deposited at −0.5 V (red line
Enhancing the thermoelectric figure of merit in engineered graphene nanoribbons
Beilstein J. Nanotechnol. 2015, 6, 1176–1182, doi:10.3762/bjnano.6.119
- . In monolayer graphene, this increases the electronic thermoelectric figure of merit ZTe from 0.01 to 0.5. The largest values of ZTe are found when a nanopore is introduced into bilayer graphene, such that the current flows from one layer to the other via the inner surface of the pore, for which
- hydrogen terminated edges (Figure 1a), a monolayer graphene nanopore with hydrogen terminated edges (Figure 1b), an AA-bilayer graphene nanoribbon (Figure 1c), an engineered bilayer graphene nanopore (Figure 1d), an AA-bilayer graphene with monolayer lead, in which the transport takes place from the top
- layer to the bottom layer (Figure 1e), an engineered bilayer graphene nanopore with monolayer leads and either hydrogen termination [9] (Figure 1f) or oxygen termination (Figure 1g) inside the pore. The ribbon lengths (L) and widths (W) in all cases are almost equal (L ≈ 6 nm, W ≈ 3 nm) and the pores
Other Beilstein-Institut Open Science Activities
