Search results
Search for "gold" in Full Text gives 760 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.
Polyvinylpyrrolidone as additive for perovskite solar cells with water and isopropanol as solvents
Beilstein J. Nanotechnol. 2019, 10, 2374–2382, doi:10.3762/bjnano.10.228
- cm2. All samples were measured in air (25 °C). Results and Discussion Figure 1 illustrates how the PSCs were prepared. The PSCs of this study comprises a SnO2 electron transfer layer (ETL), a MAPbI3 coating, a Spiro-OMeTAD HTL as well as a gold electrode. In a first step, the perovskite layer was
Multiwalled carbon nanotube based aromatic volatile organic compound sensor: sensitivity enhancement through 1-hexadecanethiol functionalisation
Beilstein J. Nanotechnol. 2019, 10, 2364–2373, doi:10.3762/bjnano.10.227
- temperature toluene and benzene sensor based on multiwall carbon nanotubes (MWCNTs) decorated with gold nanoparticles and functionalised with a long-chain thiol self-assembled monolayer, 1-hexadecanethiol (HDT). High-resolution transmission electron microscopy (HRTEM) and Fourier transform infrared
- spectroscopy (FTIR) were performed to characterize the gold nanoparticle decoration and to examine the thiol monolayer bonding to the MWCNTs. The detection of aromatic vapours using Au-MWCNT and HDT/Au-MWCNT sensors down to the ppm range shows that the presence of the self-assembled layer increases the
- sensitivity (up to 17 times), selectivity and improves the response dynamics of the sensors. Keywords: gold-decorated MWCNTs; multiwall carbon nanotubes (MWCNTs); self-assembled monolayers (SAMs); sensitivity; selectivity; vapour sensor; Introduction Aromatic volatile organic compounds (VOCs) such as
Integration of sharp silicon nitride tips into high-speed SU8 cantilevers in a batch fabrication process
Beilstein J. Nanotechnol. 2019, 10, 2357–2363, doi:10.3762/bjnano.10.226
- separate the SU8 cantilevers from the wafer. The silicon oxide layer on the tips is then stripped using buffered hydrofluoric acid. The process is completed by titanium–gold (5–20 nm) sputtering on the chip-body side of the cantilevers. This layer serves as the reflective metal coating required for the
Design of a nanostructured mucoadhesive system containing curcumin for buccal application: from physicochemical to biological aspects
Beilstein J. Nanotechnol. 2019, 10, 2304–2328, doi:10.3762/bjnano.10.222
Adsorption and desorption of self-assembled L-cysteine monolayers on nanoporous gold monitored by in situ resistometry
Beilstein J. Nanotechnol. 2019, 10, 2275–2279, doi:10.3762/bjnano.10.219
- approaches to modify a gold surface. However, only few techniques are capable of characterizing the formation of these monolayers on porous substrates. Here, we present a method to in situ monitor the adsorption and desorption of self-assembled monolayers on nanoporous gold by resistometry, using cysteine as
- resistometry. From the desorption peak related to the (111) surface of the structure, which is associated with a resistance change of 4.8%, an initial surface coverage of 0.48 monolayers of cysteine could be estimated. Keywords: L-cysteine; in situ resistometry; nanoporous gold; self-assembled monolayer (SAM
- ); voltammetry; Findings Nanoporous gold, produced by selective etching of the less noble component of a AuAg master alloy (also known as dealloying), is a very promising material in many applications due to its three-dimensional nanoporous structure. Among many other technological applications as sensing [1][2
Four self-made free surface electrospinning devices for high-throughput preparation of high-quality nanofibers
Beilstein J. Nanotechnol. 2019, 10, 2261–2274, doi:10.3762/bjnano.10.218
- reservoir to the grounded collector was 18 cm, and the collector surfaces (200 mm × 200 mm) were covered with conductive aluminum foil in order to easily remove the electrospun nanofibers for further measurements. The electrospun nanofibers were dried at room temperature and sputter-coated with a gold film
Nonlinear absorption and scattering of a single plasmonic nanostructure characterized by x-scan technique
Beilstein J. Nanotechnol. 2019, 10, 2182–2191, doi:10.3762/bjnano.10.211
- nonlinearity of a single nanostructure, but also reports surprisingly large plasmonic nonlinearities. Keywords: absorption cross section; laser scanning microscopy; nanoplasmonics; nonlinear absorption; nonlinear scattering; single gold nanostructures; Introduction It is well known that the optical
- the novel two-path x-scan method to a single gold nanostructure, we have unraveled unprecedented large nonlinearities of both scattering and absorption. Results and Discussion Microscopic measurement of a single plasmonic nanostructure The idea for characterizing the nonlinear absorption and
- obtained by subtracting the backscattering from the attenuation signal, i.e., ANP − R. In the following, we report how the attenuation and backscattering signals of a single spherical gold nanostructure with increasing excitation intensity develop from an initial linear Gaussian shape to the nonlinear
Use of data processing for rapid detection of the prostate-specific antigen biomarker using immunomagnetic sandwich-type sensors
Beilstein J. Nanotechnol. 2019, 10, 2171–2181, doi:10.3762/bjnano.10.210
- Prussian blue (PB) interlayer and a gold shell. The enzymes horseradish peroxidase and glucose oxidase were immobilized to improve sensitivity, with linear ranges between 0.01 and 80.0 ng·mL−1 for CEA and from 0.014 to 142 ng·mL−1 for AFP, and detection limits of 4 pg·mL−1 and 7 pg·mL−1, respectively [25
- carbon electrodes (INμ-SPCEs) showed limits of detection of 0.23 pg·mL−1 for PSA and 0.30 pg·mL−1 for IL-6, measured in the serum of prostate cancer patients [26]. Immunosensors to detect PSA include magnetic nanoparticles modified with gold [27], nitrodopamine functionalized iron oxide nanoparticles [3
- polyclonal antibody, (3) capture of biomarker by the bioconjugate, (4) sandwich formation by injection of the biomarker captured by Ab2-MNP-HRP in the microfluidic system. The first step included the deposition of a bilayer of poly(diallyldimethylammonium) (PDDA) and gold nanoparticles (AuNPs) decorated with
Nitrogen-vacancy centers in diamond for nanoscale magnetic resonance imaging applications
Beilstein J. Nanotechnol. 2019, 10, 2128–2151, doi:10.3762/bjnano.10.207
- network parameter comparisons. This physiological study motivated the culture of neuronal networks onto a specific glass coverslip with embedded gold microwave resonator for ODMR sensing coated with polydimethylsiloxane using the same culturing procedure as for the physiological study. The ND suspension
The importance of design in nanoarchitectonics: multifractality in MACE silicon nanowires
Beilstein J. Nanotechnol. 2019, 10, 2094–2102, doi:10.3762/bjnano.10.204
- nucleophilic substitution reaction takes place, which causes silicon atoms to be etched/removed from the substrate. The metal layer, which is not consumed during the process, simply sinks down while the uncovered parts of the substrate form the tips of the NWs. Indeed, no consummation occurs when gold is used
- the cleaned surfaces by electron beam evaporation. These gold films do not coat the substrates uniformly. The uncovered parts of the Si surfaces become the seeds of the NWs in the subsequent etching step. For the etching step, the substrates are immersed in an aqueous solution of HF (5 M) and H2O2
- Si substrate by electron beam evaporation. The conditions during the growth of the gold thin film were similar to the ones during the growth of the samples SiNW1 and SiNW2. The black regions correspond to the uncovered silicon areas, while the white region represents the deposited Au. It is evident
Incorporation of doxorubicin in different polymer nanoparticles and their anticancer activity
Beilstein J. Nanotechnol. 2019, 10, 2062–2072, doi:10.3762/bjnano.10.201
- suspensions were diluted with purified water to 0.25 mg/mL. The suspension was dripped on a filter (MF-Millipore™ membrane filter VSWP, 0.1 µm) and dried for 24 h in a desiccator. Afterwards, the membranes were sputtered with gold under argon atmosphere (SCD 040, BAL-TEC, Balzers, Liechtenstein). The SEM
Synthesis of highly active ETS-10-based titanosilicate for heterogeneously catalyzed transesterification of triglycerides
Beilstein J. Nanotechnol. 2019, 10, 2039–2061, doi:10.3762/bjnano.10.200
Nanostructured and oriented metal–organic framework films enabling extreme surface wetting properties
Beilstein J. Nanotechnol. 2019, 10, 1994–2003, doi:10.3762/bjnano.10.196
- nanostructured M-CAT-1 films exhibiting pronounced needle-like morphology on gold substrates were established by incorporating a crystallization promoter into the film synthesis. These nanostructured M-CAT-1 MOF films feature extreme wetting phenomena, specifically superhydrophilic and underwater superoleophobic
- were synthesized as highly crystalline bulk materials. The M-CAT-1 surface energy was estimated by contact angle measurements using pellet samples exposing nonoriented crystallites on the surface. Next, oriented and compact Co- and Ni-CAT-1 films were deposited on gold surfaces by vapor-assisted
- conversion (VAC). These films showed enhanced hydrophilic and underwater oleophobic properties compared to the corresponding pressed pellet samples. Oriented, nanostructured M-CAT-1 films exhibiting a pronounced needle-like morphology on gold substrates were obtained by adding a crystallization promotor into
Gold-coated plant virus as computed tomography imaging contrast agent
Beilstein J. Nanotechnol. 2019, 10, 1983–1993, doi:10.3762/bjnano.10.195
- computed tomography (CT) imaging in vitro. The gold-coated cowpea mosaic virus (Au-CPMV) particles were generated by the electrostatic adsorption of positively charged electrolyte on the virus capsid with the subsequent incubation and reduction of anionic gold complexes. Au-CPMV particles as a CT contrast
- ; computed tomography (CT); gold; nanotechnology; viruses; targeting; Introduction Numerous types of nanomaterials are currently under investigation in medicine, including dendrimers, polymeric nanoparticles (NPs), liposomes and protein-based NPs. Each system has advantages and disadvantages in terms of its
- contrast agents including gold nanoparticles (AuNPs) [13], bromine [14], platinum [15], ytterbium [16], gadolinium [4], and tungsten [15]. Many of the systems are made up of a core that is coated with a polymeric material such as liposomes [17], micelles [13], lipoproteins or polymeric nanoparticles [18
Porous silver-coated pNIPAM-co-AAc hydrogel nanocapsules
Beilstein J. Nanotechnol. 2019, 10, 1973–1982, doi:10.3762/bjnano.10.194
- , Zhao et al. created pH- and temperature-sensitive bioprobes by incorporating pNIPAM hydrogel cores with europium organic complexes [67]. In separate studies, Lee and co-workers utilized both biocompatible gold nanoshells, iron oxide nanoparticles, and gold nanorods with thermo-responsive hydrogel
- nanoscale delivery system that can be targeted, optically activated, and subsequently release a payload (e.g., drugs). Notably, gold and silver nanoshells can be heated by application of NIR light and subsequently be used to transfer heat to an incorporated hydrogel polymer particle [69]. Upon heating
- , these hydrogel polymers shrink and release water and other materials encapsulated inside. Typically, gold, silver, and copper are the most commonly used materials for NIR activation, with silver being intermediate in both cost and oxidation resistance. Previous efforts have reported the combination of
The influence of porosity on nanoparticle formation in hierarchical aluminophosphates
Beilstein J. Nanotechnol. 2019, 10, 1952–1957, doi:10.3762/bjnano.10.191
- 0FA, UK Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK 10.3762/bjnano.10.191 Abstract In this work we explore the deposition of gold onto a silicoaluminophosphate, using a variety of known nanoparticle deposition techniques. By comparing the gold particles
- as supports for gold deposition in order to explore the influence that the microporous and hierarchical systems had on the nanoparticles characteristics. All three deposition methods (IW, WI and AE) were carried out on both HP-SAPO-5 and MP-SAPO-5 with an intended theoretical loading of 1 wt % Au
- . Metal analysis on the deposited MP-SAPO-5 (Table S3, Supporting Information File 1) shows that the gold loadings vary significantly depending on the immobilisation strategy used, with IW being the most effective (0.66 wt % Au) and WI being the least (0.10 wt % Au). Likely the minimal amount of solvent
Engineered superparamagnetic iron oxide nanoparticles (SPIONs) for dual-modality imaging of intracranial glioblastoma via EGFRvIII targeting
Beilstein J. Nanotechnol. 2019, 10, 1860–1872, doi:10.3762/bjnano.10.181
- studied with regard to their long blood half-life [11], easy surface modification and excellent biocompatibility [12]. In the past years, several multifunctional vehicles for glioblastoma imaging have been developed, such as gold nanoparticles [13][14], which were integrated for diagnosis and treatment
Microfluidic manufacturing of different niosomes nanoparticles for curcumin encapsulation: Physical characteristics, encapsulation efficacy, and drug release
Beilstein J. Nanotechnol. 2019, 10, 1826–1832, doi:10.3762/bjnano.10.177
- unwanted side effects [8][9]. Liposomes, solid lipid nanoparticles, dendrimers, micelles, polymeric nanoparticles, gold nanoparticles, and carbon nanotubes are among the most common types of nanoparticle delivery systems [10]. These efforts have been reported in several studies. For example, Guo et al
Nanoarchitectonics meets cell surface engineering: shape recognition of human cells by halloysite-doped silica cell imprints
Beilstein J. Nanotechnol. 2019, 10, 1818–1825, doi:10.3762/bjnano.10.176
- cells templates offer other fascinating opportunities due to their cell-mimicking geometries, for example, a novel class of bioinspired colloid particles was fabricated recently. Colloid antibodies were produced via the formation of solid silica shells doped with gold nanoparticles on bacterial cells
- , fixed with formaldehyde, sputter-coated with a thin gold layer and then imaged using a Hitachi SU8000 microscope. As shown in Figure 2D–F, the typical smooth surface topography of HeLa cells was changed drastically by the deposition of either pure or halloysite-doped silica. Analysing the cell diameter
- . Characterisation Scanning electron microscopy (SEM) imaging of samples sputter-coated with gold was performed with a Hitachi SU8000 microscope equipped with energy-dispersive X-ray (EDX) spectrometer. The interaction of cells with inorganic shapes was also recorded with an atomic-force microscope (Dimension Icon
Toxicity and safety study of silver and gold nanoparticles functionalized with cysteine and glutathione
Beilstein J. Nanotechnol. 2019, 10, 1802–1817, doi:10.3762/bjnano.10.175
- Zagreb, Croatia 10.3762/bjnano.10.175 Abstract This study was designed to evaluate the nano–bio interactions between endogenous biothiols (cysteine and glutathione) with biomedically relevant, metallic nanoparticles (silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs)), in order to assess the
- . Keywords: biocompatibility; cysteine; ecotoxicity; glutathione; nano–bio interactions; nanosafety; nanotoxicity; Introduction Metallic nanoparticles (NPs) such as silver and gold have been employed in a wide range of products and applications in the biomedical field owing to their remarkable physico
- -chemical properties. Silver nanoparticles (AgNPs) are extensively used in antimicrobial coatings for medical devices, wound dressing, cosmetic products and food packaging due to their antimicrobial, antiangiogenic and anti-inflammatory properties [1][2][3][4][5]. Biomedical applications of gold
Growth dynamics and light scattering of gold nanoparticles in situ synthesized at high concentration in thin polymer films
Beilstein J. Nanotechnol. 2019, 10, 1768–1777, doi:10.3762/bjnano.10.172
- inorganic film by, e.g., thermal annealing. Results: Simple laser reflection experiments showed that this growth process induced light scattering at the film/air interface. We report on this phenomenon, considering the growth dynamics of gold nanoparticles in a polymer film. The scattering of light was
- regimes in the dynamics of the nanoparticle growth and in the optical response of the nanocomposite. Keywords: gold; imaging ellipsometry; metal nanoparticles; plasmonic nanocomposite; polymer films; Introduction Over the last 20 years, numerous studies were carried out to investigate the optical
- properties of plasmonic nanocomposite materials from experimental, theoretical as well as numerical points of view [1][2]. Metal nanoparticles (NPs) play a central role in the development of nanotechnology-based optical devices. Gold nanoparticles (AuNPs) are used in spectrally selective coatings to block
Synthesis of nickel/gallium nanoalloys using a dual-source approach in 1-alkyl-3-methylimidazole ionic liquids
Beilstein J. Nanotechnol. 2019, 10, 1754–1767, doi:10.3762/bjnano.10.171
- copper or gold grids. The size distribution was determined manually or with the aid of the Gatan Digital Micrograph software from at least 50 individual particles. Selected-area electron diffraction (SAED) patterns have been recorded with the above mentioned TEM instruments. The area selection was
- obtaining focused diffraction patterns. The diffraction images were calibrated with Debye–Scherrer patterns recorded from a gold reference sample (S106, Plano GmbH, Wetzlar, Germany). High-resolution X-ray photoelectron spectroscopy, HRXPS- (ESCA-) measurements were performed with a Fisons/VG Scientific
- samples of copper, silver and gold at 50 eV and 10 eV pass energy and comparison with reference values. Spectra were obtained with an Al Kα X-ray source, using C 1s as a reference for the binding energy [50]. Gas chromatography–mass spectrometry (GC–MS) data were recorded on a Thermo Finnigan Trace DSQ
Novel hollow titanium dioxide nanospheres with antimicrobial activity against resistant bacteria
Beilstein J. Nanotechnol. 2019, 10, 1716–1725, doi:10.3762/bjnano.10.167
- -positive and Gram-negative bacteria [2]. In recent years, metal and metal oxide NPs, such as silver, gold, titanium and zinc oxide NPs, have been extensively studied due to their interesting antimicrobial character [3][4][5]. Titanium dioxide (TiO2) NPs have also attracted significant attention due to
Doxorubicin-loaded human serum albumin nanoparticles overcome transporter-mediated drug resistance in drug-adapted cancer cells
Beilstein J. Nanotechnol. 2019, 10, 1707–1715, doi:10.3762/bjnano.10.166
- (IsoporeTM membrane filter, Merck Millipore, Darmstadt, Germany) and dried overnight in a desiccator. Afterwards, the membrane filter was sputtered with gold (Sputter SCD 040, BALTEC, Liechtenstein) under argon atmosphere. SEM was performed on a CamScan CS4 microscope (Cambridge Scanning Company, Cambridge
Nanoporous smartPearls for dermal application – Identification of optimal silica types and a scalable production process as prerequisites for marketed products
Beilstein J. Nanotechnol. 2019, 10, 1666–1678, doi:10.3762/bjnano.10.162
- name smartCrystals®) [8][9][10]. These materials have been on the market as commercial dermal cosmetic products since 2007 (e.g., hesperidin, la prairie Switzerland) [11][12]. They can be considered as the current “gold standard”. The trick with nanocrystals is that the physicochemical properties on
- ) with a Moticam camera and the software Motic Images Plus at 100, 400, and 1,000-fold magnification. SEM was performed at 10,000-fold magnification using a Zeiss DSM950 (Carl Zeiss AG, Germany) instrument. The samples were sputter-coated with gold–palladium in an argon atmosphere at 15–20 kV at 0.05
Other Beilstein-Institut Open Science Activities
