Wearable, stable, highly sensitive hydrogel–graphene strain sensors

• Jian Lv,
• Chuncai Kong,
• Chao Yang,
• Lu Yin,
• Itthipon Jeerapan,
• Fangzhao Pu,
• Xiaojing Zhang,
• Sen Yang and
• Zhimao Yang

Beilstein J. Nanotechnol. 2019, 10, 475–480, doi:10.3762/bjnano.10.47

• cast onto the hydrogel through drop casting and drying. Although the bare hydrogel already shows resistance changes with respect to strain, the graphene film was used to further increase the sensitivity. The graphene/WG-hydrogel strain sensor can be used to sense human finger movements. This stable

• hydrogel film using a drop casting and drying process. 5 mL of the 2 mg/mL graphene dispersion was drop casted onto the hydrogel and put in the oven at 35 °C until the graphene was fully dried. Assembly of the strain sensor: The strain sensor was fabricated by connecting the graphene/hydrogel to a copper

• , and the formation of ice at low temperature is restricted and the evaporation of water at high temperature is prohibited [11]. The graphene layer was formed on the hydrogel by directly drop casting the graphene solution onto the hydrogel and drying in an oven at 35 °C. The drying process removes the

Raman study of flash-lamp annealed aqueous Cu₂ZnSnS₄ nanocrystals

• Yevhenii Havryliuk,
• Oleksandr Selyshchev,
• Mykhailo Valakh,
• Alexandra Raevskaya,
• Oleksandr Stroyuk,
• Constance Schmidt,
• Volodymyr Dzhagan and
• Dietrich R. T. Zahn

Beilstein J. Nanotechnol. 2019, 10, 222–227, doi:10.3762/bjnano.10.20

• , up to 60 J/cm2, on NC films deposited on a glass substrate by drop-casting. The influence of film thickness and crystallinity of the initial NCs (before FLA) was also studied. Raman scattering was chosen as a main characterization method in this work, because it has already proved to be very

• FLA treatment, CZTS samples were deposited on a glass substrate by drop-casting. In order to investigate the effect of flash annealing at various energy densities, a series of samples was prepared from 0 up to 60 J/cm2 in steps of 5 J/cm2 with a pulse duration of 17.8 ms. Raman spectra were excited

Surface plasmon resonance enhancement of photoluminescence intensity and bioimaging application of gold nanorod@CdSe/ZnS quantum dots

• Siyi Hu,
• Yu Ren,
• Yue Wang,
• Jinhua Li,
• Junle Qu,
• Liwei Liu,
• Hanbin Ma and
• Yuguo Tang

Beilstein J. Nanotechnol. 2019, 10, 22–31, doi:10.3762/bjnano.10.3

• prepared by drop casting the sample dispersion onto an amorphous carbon-coated 300 mesh copper grid. Synthesis of GNRs To synthesize the GNRs, the seed-mediated growth method in CTAB solution was applied, as previously discussed [30][31]. The seed solution was prepared using 5 mL of a 0.2 M CTAB solution

Synthesis of rare-earth metal and rare-earth metal-fluoride nanoparticles in ionic liquids and propylene carbonate

• Marvin Siebels,
• Lukas Mai,
• Laura Schmolke,
• Kai Schütte,
• Juri Barthel,
• Junpei Yue,
• Jörg Thomas,
• Bernd M. Smarsly,
• Anjana Devi,
• Roland A. Fischer and
• Christoph Janiak

Beilstein J. Nanotechnol. 2018, 9, 1881–1894, doi:10.3762/bjnano.9.180

• images were recorded with a Gatan UltraScan 1000P detector. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) as shown in Figure S4a (Supporting Information File 1) was also performed with this microscope. TEM samples were prepared by drop-casting the diluted material

Tuning adhesion forces between functionalized gold colloidal nanoparticles and silicon AFM tips: role of ligands and capillary forces

• Sven Oras,
• Sergei Vlassov,
• Marta Berholts,
• Rünno Lõhmus and
• Karine Mougin

Beilstein J. Nanotechnol. 2018, 9, 660–670, doi:10.3762/bjnano.9.61

• obtained chemical end groups is presented in Table 2. NPs were characterized by transmission electron microscopy (TEM, ARM200 from JEOL). Drop casting of colloidal solution and drying process The experimental protocol of drop casting was the following: a microliter drop of gold colloidal solution was

• drop-casting. Adhesion was measured by a Bruker Multimode 8 AFM with the Peakforce Quantitative Nanomechanics (PeakForce QNM) mode. PeakForce QNM mode is a recent advancement in AFM method providing quantitative nanomechanical mapping mode with the simultaneous measurement of the sample’s adhesion

Enhanced photoelectrochemical water splitting performance using morphology-controlled BiVO₄ with W doping

• Xin Zhao and
• Zhong Chen

Beilstein J. Nanotechnol. 2017, 8, 2640–2647, doi:10.3762/bjnano.8.264

• by drop-casting of metal organic precursors with different volume ratios of water to ethylene glycol (EG). The morphologies of the obtained films are shown in Figure 1. An overview of the synthesis conditions and the corresponding sample labels can be found in Table 1. A detailed description of the

The role of ligands in coinage-metal nanoparticles for electronics

• Ioannis Kanelidis and
• Tobias Kraus

Beilstein J. Nanotechnol. 2017, 8, 2625–2639, doi:10.3762/bjnano.8.263

• reached a conductivity of 2000 S/cm [132]. Conventional drop casting of one size of gold nanoparticles functionalized by a π-conjugated terthiophene resulted in films of hexagonally packed particles. The terthiophene ligands aligned around the assembled particles, enabled face-to-face π–π interactions

Synthesis and characterization of noble metal–titania core–shell nanostructures with tunable shell thickness

• Bartosz Bartosewicz,
• Marta Michalska-Domańska,
• Malwina Liszewska,
• Dariusz Zasada and
• Bartłomiej J. Jankiewicz

Beilstein J. Nanotechnol. 2017, 8, 2083–2093, doi:10.3762/bjnano.8.208

• . The samples for SEM were prepared by drop-casting suspensions of the core–shell nanostructures on a silicon wafer and drying in air. SEM images and TRPS size histograms of Au@TiO2 (Samples A–D) structures with various titania shell thicknesses (see Table 1). SEM images and TRPS size histograms of Ag

Uptake and intracellular accumulation of diamond nanoparticles – a metabolic and cytotoxic study

• Antonín Brož,
• Lucie Bačáková,
• Pavla Štenclová,
• Alexander Kromka and
• Štěpán Potocký

Beilstein J. Nanotechnol. 2017, 8, 1649–1657, doi:10.3762/bjnano.8.165

• measurements to eliminate sample cross contamination. A Nicolet 8700 FTIR spectrometer (Thermo Scientific, USA) was equipped with N2 purging, a KBr beamsplitter and an MCT detector cooled by liquid nitrogen. 50 µL of the water suspension with NDs was applied on the Au mirror by the drop-casting method just

AgCl-doped CdSe quantum dots with near-IR photoluminescence

• Pavel A. Kotin,
• Sergey S. Bubenov,
• Natalia E. Mordvinova and
• Sergey G. Dorofeev

Beilstein J. Nanotechnol. 2017, 8, 1156–1166, doi:10.3762/bjnano.8.117

• with a large solid-angle CENTURIO EDX detector and Quantum EELS spectrometer. TEM samples were obtained by drop-casting QD/hexane sols on Cu holey and formvar carbon grids. Size distributions were obtained from TEM images. XRD measurements were performed with the use of a Rigaku D/MAX 2500 (Cu Kα

Adsorption characteristics of Er₃N@C₈₀on W(110) and Au(111) studied via scanning tunneling microscopy and spectroscopy

• Sebastian Schimmel,
• Zhixiang Sun,
• Danny Baumann,
• Denis Krylov,
• Nataliya Samoylova,
• Alexey Popov,
• Bernd Büchner and
• Christian Hess

Beilstein J. Nanotechnol. 2017, 8, 1127–1134, doi:10.3762/bjnano.8.114

• was purchased from SES Research. For STM measurements, the samples was purified by high-pressure liquid chromatography (HPLC) with Buckyprep-M column and toluene as a solvent, washed with acetone and hexane, and then transferred to the crucible of the Knudsen cell by drop-casting from toluene. To

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

• in depositing LPE graphene-based ink in a controlled manner so as to produce sensor devices with reproducible performances in terms of electrical responses upon gas exposures [11]. This is not guaranteed by other conventional liquid-phase processes like drop-casting [12]. Hence, a LPE graphene

• rather unexpected and it deserves to be further investigated in a future work since, according to our experience, devices prepared with the same type of graphene dispersion onto Al2O3 and Si/SiO2 by drop-casting are stable and show better sensing performances over much longer times [16]. In order to

• fabrication in comparison to other techniques commonly used, e.g., drop-casting deposition. Overall, the main drawback in paper-based devices is the surface morphology of the sensing film, induced by the granular surface of the substrate. The Al2O3-based device, which shows a surface characterized by planar

Nanoantenna-assisted plasmonic enhancement of IR absorption of vibrational modes of organic molecules

• Alexander G. Milekhin,
• Olga Cherkasova,
• Sergei A. Kuznetsov,
• Ilya A. Milekhin,
• Ekatherina E. Rodyakina,
• Alexander V. Latyshev,
• Sreetama Banerjee,
• Georgeta Salvan and
• Dietrich R. T. Zahn

Beilstein J. Nanotechnol. 2017, 8, 975–981, doi:10.3762/bjnano.8.99

• energy of the most pronounced vibrational modes in cortisol. The deposition of cortisol on a solid substrate implies, as a general rule, the use of the drop-casting method, which results in inhomogeneous coverage. The dielectric function of the media surrounding the nanoantennas is changed after

• )-11,17,21-trihydroxypregn-4-ene-3,20-dione) was purchased from Calbiochem (USA) and was used without further purification. Cortisol dissolved in ethanol at concentration of 10 ng/mL (27.6 μM) was deposited onto arrays of Au nanoantennas by drop-casting. The drop volume was 2 μL. The LSPR energy on Au

Methods for preparing polymer-decorated single exchange-biased magnetic nanoparticles for application in flexible polymer-based films

• Laurence Ourry,
• Delphine Toulemon,
• Souad Ammar and
• Fayna Mammeri

Beilstein J. Nanotechnol. 2017, 8, 408–417, doi:10.3762/bjnano.8.43

• the ligand exchange procedure and dispersed in THF. Thin films were prepared by drop casting on silicon wafers and SEM images were recorded. Interestingly, Figure 9 depicts an incomplete monolayer of ENPs (with a scheme presented in the insert). Then, ENP-PMMA was introduced in a solution of PMMA in

• ATRP initiator after 3 h polymerization; (c,d) ENP-Br obtained by ligand exchange (oleic acid/ATRP initiator) under the same conditions. Thin films prepared by drop casting of a suspension of ENP-PMMA in THF. SEM images of various assemblies of ENP-PMMA, obtained by drop casting from THF suspension

Effect of Anderson localization on light emission from gold nanoparticle aggregates

• Mohamed H. Abdellatif,
• Marco Salerno,
• Gaser N. Abdelrasoul,
• Ioannis Liakos,
• Alice Scarpellini,
• Sergio Marras and
• Alberto Diaspro

Beilstein J. Nanotechnol. 2016, 7, 2013–2022, doi:10.3762/bjnano.7.192

• size and shape of the nanostructured system. In this work, we studied the photoluminescence dependence of aggregates of 14 nm diameter gold nanoparticles (AuNPs) synthesized by drop-casting a liquid suspension on two different substrates of glass and quartz. The AuNP aggregates were characterized by

• AuNPs was then drop cast on the substrates in ambient conditions in order to obtain the films of AuNP aggregates. The substrates were cleaned by sonication for 20 min in a 1:1 mixture of ethanol/milli-Q water, prior to drop casting. Sample characterization The AuNP absorbance was characterized by a

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

• method described by Masson et al. [39][40]. Drop casting of the polystyrene particles on a clean glass slide leads to a densely packed monolayer on the substrate (Figure 2). The sphere mask consists of ordered areas of several square millimetres covering more than the optical spot size of the SPR device

Optical absorption signature of a self-assembled dye monolayer on graphene

• Tessnim Sghaier,
• Sylvain Le Liepvre,
• Céline Fiorini,
• Ludovic Douillard and
• Fabrice Charra

Beilstein J. Nanotechnol. 2016, 7, 862–868, doi:10.3762/bjnano.7.78

• types of depositions are reported: (i) drop casting of a droplet of a toluene solution containing the exact amount of molecules needed for a coverage of 0.45 molecule per nm2 (SAM 1) and (ii) dip-coating in a ca. 10−5 M solution in toluene followed by rinsing in toluene and ethanol (SAM 2). The

• transmission spectra of SAM1 and SAM2 are nearly identical and correspond to a rigid bathochromic shift of 0.14 eV (1130 cm−1) of the whole vibronic system. This quantitative similarity further supports the homogeneous formation of one monolayer by dip coating, as was shown in the case of drop casting. At the

• drop casting is very similar to the one reported in the literature for PTCDI microcrystalline films [36] (µC, solid and dotted lines). Moreover, micro-spectroscopy has shown a high inhomogeneity of the absorption strength, whereas the measured spectra acquired at different places remain homothetic

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

• ratio in order to retain the conformational stability of bR in the solution phase without affecting its photoactive properties [37]. The drop casting method was used for the deposition of this suspension on the ZnO-TF as well as ZnO-NRs [14]. This modification serves to enhance the surface activity

• /bR) were fabricated by manually drop casting 50 µL of the bR protein suspension (using a micropipette) on the ZnO-TF and ZnO-NR substrates (625 mm2 area) [14]. The deposited film was dried in vacuum at room temperature by using a standard 3 L desiccator connected to a Millipore vacuum pump (4 bar

• ), respectively. Comparative XRD patterns of the ZnO-TF, ZnO-TF/bR, ZnO-NR and ZnO-NR/bR structures. SEM characterization. (a) ZnO-TF has grown over the ITO substrate and was annealed at 400 °C. (b) ZnO-NR structure grown over the ZnO-TF seed layer. (c) ZnO-TF/bR hybrid structure prepared by drop casting. (d) ZnO

Controlled graphene oxide assembly on silver nanocube monolayers for SERS detection: dependence on nanocube packing procedure

• Martina Banchelli,
• Bruno Tiribilli,
• Roberto Pini,
• Luigi Dei,
• Paolo Matteini and
• Gabriella Caminati

Beilstein J. Nanotechnol. 2016, 7, 9–21, doi:10.3762/bjnano.7.2

• GO. Although fabrication of GO-covered nanoparticles has been explored using several methods such as voltammetric co-reduction [33], formation of composite graphene oxide/PAMAM–silver nanoparticles through self-assembly followed by microwave irradiation [34] and GO drop-casting onto amino

• graphene oxide deposits on silicon oxide obtained by simple drop casting followed by evaporation and shows, as expected, the presence of irregularly shaped sheets of lateral dimension ranging from a few nanometres to micrometres with nonuniform thickness ranging from 1.0 nm for single layers to 3.6 nm for

Nanoscale rippling on polymer surfaces induced by AFM manipulation

• Mario D’Acunto,
• Franco Dinelli and
• Pasqualantonio Pingue

Beilstein J. Nanotechnol. 2015, 6, 2278–2289, doi:10.3762/bjnano.6.234

• interpretation of the data more complicated. Presence of solvents: As it is widely known, polymers dissolve in solvents with similar chemo-physical properties. This is why they can be easily molded in a variety of shapes including thin films, by means of spin coating or drop casting. The relative presence of

Optimized design of a nanostructured SPCE-based multipurpose biosensing platform formed by ferrocene-tethered electrochemically-deposited cauliflower-shaped gold nanoparticles

• Wicem Argoubi,
• Maroua Saadaoui,
• Sami Ben Aoun and
• Noureddine Raouafi

Beilstein J. Nanotechnol. 2015, 6, 1840–1852, doi:10.3762/bjnano.6.187

• biosensor was prepared by simply drop-casting a mixture of the HRP enzyme solution and chitosan as displayed in Figure 1. The chitosan was used as a matrix to retain the enzyme on the nanostructured surface [39]. The stepwise preparation was also characterized using CV and EIS spectroscopy. CV showed an

• ultrapure water and the unmodified gold was blocked by the addition of 5 µL of a 3% BSA solution. The enzyme-based platform was prepared by drop-casting 5 µL of HRP solution (10 mg/mL) onto the ferrocene-modified cfAuNPs-structured electrode. Determination of the concentrations of hIgG and H2O2 in real

Electrical properties and mechanical stability of anchoring groups for single-molecule electronics

• Riccardo Frisenda,
• Simge Tarkuç,
• Elena Galán,
• Mickael L. Perrin,
• Rienk Eelkema,
• Ferdinand C. Grozema and
• Herre S. J. van der Zant

Beilstein J. Nanotechnol. 2015, 6, 1558–1567, doi:10.3762/bjnano.6.159

• tip-shaped electrodes. The vertical displacement of the pushing rod translates in an horizontal displacement in the plane of the electrode with an attenuation factor of 5 · 10−5. Molecules 1–4 were deposited onto the MCBJ device by drop-casting a solution (2 μL of 1 mM in dichloromethane) on the

Electronic interaction in composites of a conjugated polymer and carbon nanotubes: first-principles calculation and photophysical approaches

• Florian Massuyeau,
• Jany Wéry,
• Jean-Luc Duvail,
• Serge Lefrant,
• Abu Yaya,
• Chris Ewels and
• Eric Faulques

Beilstein J. Nanotechnol. 2015, 6, 1138–1144, doi:10.3762/bjnano.6.115

• SWNT in methanol as solvent. PPV–SWNT composite films of 200 nm thickness were obtained with SWNT mass concentrations x = 0–64% by drop casting onto ultraclean quartz substrates followed by thermal conversion under vacuum at 573 K. Time-resolved PL experiments were carried out by exciting the samples

Exploiting the hierarchical morphology of single-walled and multi-walled carbon nanotube films for highly hydrophobic coatings

• Francesco De Nicola,
• Paola Castrucci,
• Manuela Scarselli,
• Francesca Nanni,
• Ilaria Cacciotti and
• Maurizio De Crescenzi

Beilstein J. Nanotechnol. 2015, 6, 353–360, doi:10.3762/bjnano.6.34

• angles of samples was V = 10 μL. Moreover, every contact angle was measured 15 s after drop casting to ensure that the droplet reached its equilibrium position. Scanning electron micrographs of SWCNT (a,c) and MWCNT (b,d) films at different magnifications 200,000× (a,b), and 10,000× (c,d). In the images

Poly(styrene)/oligo(fluorene)-intercalated fluoromica hybrids: synthesis, characterization and self-assembly

• Giuseppe Leone,
• Francesco Galeotti,
• William Porzio,
• Guido Scavia,
• Luisa Barba,
• Gianmichele Arrighetti,
• Giovanni Ricci,
• Chiara Botta and
• Umberto Giovanella

Beilstein J. Nanotechnol. 2014, 5, 2450–2458, doi:10.3762/bjnano.5.254

• PT15 (Figure 3). Thicker films of PT5, PT15 and PT30 prepared by drop casting of toluene solutions, show a distribution of SME aggregates ranging from a few micrometers to a few tens of micrometers. As evidenced by the fluorescence microscope images in Figure 4, the blue emission comes solely from the

• orientation of most of the silicates forming clusters (Figure 4d). Self-assembly We explored further possibilities of organization of these materials by drop casting dilute solutions in carbon disulfide under humid atmosphere. Under these conditions, the fast evaporation of the solvent and its consequent