Gas sensing properties of individual SnO₂ nanowires and SnO₂ sol–gel nanocomposites

• Alexey V. Shaposhnik,
• Dmitry A. Shaposhnik,
• Sergey Yu. Turishchev,
• Olga A. Chuvenkova,
• Stanislav V. Ryabtsev,
• Alexey A. Vasiliev,
• Xavier Vilanova,
• Francisco Hernandez-Ramirez and
• Joan R. Morante

Beilstein J. Nanotechnol. 2019, 10, 1380–1390, doi:10.3762/bjnano.10.136

• the sensor is determined not only by the number of adsorption sites, but also by the electrical conduction mechanism. Smaller particles correspond to larger specific surface areas; the electrical conduction across such particles is more sensitive to an increase in the Debye layer width than by

Pure and mixed ordered monolayers of tetracyano-2,6-naphthoquinodimethane and hexathiapentacene on the Ag(100) surface

• Robert Harbers,
• Timo Heepenstrick,
• Dmitrii F. Perepichka and
• Moritz Sokolowski

Beilstein J. Nanotechnol. 2019, 10, 1188–1199, doi:10.3762/bjnano.10.118

• resolved STM images of clean Ag surface regions in parallel with islands of the molecules. However, this was experimentally not possible. This uncertainty concerning the adsorption sites applies also to the other hard-sphere models that we will report, e.g., that of the HTPEN/TNAP layer given below. Figure

• HTPEN and TNAP molecule sits exactly on the same adsorption sites on the Ag surface. Notably, the azimuthal orientation of the HTPEN molecules with respect to the substrate in the mixed HTPEN/TNAP phase differs significantly from that in the pure HTPEN phase (cf. Figure 2b and Figure 6d), whereas the

The effect of translation on the binding energy for transition-metal porphyrines adsorbed on Ag(111) surface

• Luiza Buimaga-Iarinca and
• Cristian Morari

Beilstein J. Nanotechnol. 2019, 10, 706–717, doi:10.3762/bjnano.10.70

• degrees of freedom of the molecule. The only system where we found a position-dependent magnetic moment is NiPP, where in the low-symmetry point a magnetic moment close to 2μB is obtained, while for other adsorption sites the magnetic moment is zero. Detailed information collected for a range of

• adsorption sites may find utility in the understanding of the surface dynamics as well as in the design of experiments oriented to the fabrication of nanostructures with controlled functionalities. Also, the comparison between properties of the six transition-metal porphyrines on silver may serve in the

Intuitive human interface to a scanning tunnelling microscope: observation of parity oscillations for a single atomic chain

• Sumit Tewari,
• Jacob Bakermans,
• Christian Wagner,
• Federica Galli and
• Jan M. van Ruitenbeek

Beilstein J. Nanotechnol. 2019, 10, 337–348, doi:10.3762/bjnano.10.33

• geometrical argument can be used on other surfaces as well, and it can be used to determine, e.g., on-top, bridge, and hollow adsorption sites of small molecules. A related approach by tracking an adatom movement and position to get the information about the background lattice has been reported earlier by

• show STM images with the topography colour scale tuned to reduce the apparent size of the two adatoms to match the superimposed surface lattice pattern. The full apparent size of Au adatoms on Au(111) is around 1 nm as shown in Figure 2b. (a) shows the two possible triangular hollow adsorption sites

Removal of toxic heavy metals from river water samples using a porous silica surface modified with a new β-ketoenolic host

• Said Tighadouini,
• Smaail Radi,
• Abderrahman Elidrissi,
• Khadija Haboubi,
• Maryse Bacquet,
• Stéphanie Degoutin,
• Mustapha Zaghrioui and
• Yann Garcia

Beilstein J. Nanotechnol. 2019, 10, 262–273, doi:10.3762/bjnano.10.25

• ). This indicates that the adsorption of metal ions occurs by a monolayer formation in the same limited number of adsorption sites on a homogeneous adsorbent surface. Thermodynamic modeling. The influence of temperature on the adsorption of Zn(II), Pb(II), Cd(II) and Cu(II) ions onto SiNL was evaluated

Graphene-enhanced metal oxide gas sensors at room temperature: a review

• Dongjin Sun,
• Yifan Luo,
• Marc Debliquy and
• Chao Zhang

Beilstein J. Nanotechnol. 2018, 9, 2832–2844, doi:10.3762/bjnano.9.264

• turn leads to a high specific surface area. Graphene enhances the conductivity of the composite materials, enabling the composite sensors to achieve a high response at low operating temperatures. Moreover, the introduction of graphene provides more adsorption sites at the surface of the composite so

• number of adsorption sites. Moreover, the TiO2–rGO sensor showed a better selectivity to NH3 than the pure rGO sensor owing to the acidic surface of TiO2 preferentially adsorbing primarily NH3. Ye et al. [74] stated that a TiO2–rGO sensor, fabricated via depositing GO and TiO2 nanoparticles on IDEs and

• , the specific surface area of vertical graphene sheets is extremely increased. The SnO2 nanoparticles on the VG sheets with the 3D structure provided numerous adsorption sites for target gas molecules. Apart from the abovementioned common MOS, some other MOS also have exceptional sensing properties

Controlling surface morphology and sensitivity of granular and porous silver films for surface-enhanced Raman scattering, SERS

• Sherif Okeil and
• Jörg J. Schneider

Beilstein J. Nanotechnol. 2018, 9, 2813–2831, doi:10.3762/bjnano.9.263

• ) compared to the continuous silver network as in case of the thicker 200 nm silver film. Therefore, in the 200 nm silver films more adsorption sites for the analyte are created and an increased SERS effect is observed for a particular concentration of RhB. Thus, for the 10 nm silver films hydrogen and argon

Nanocellulose: Recent advances and its prospects in environmental remediation

• Katrina Pui Yee Shak,
• Yean Ling Pang and
• Shee Keat Mah

Beilstein J. Nanotechnol. 2018, 9, 2479–2498, doi:10.3762/bjnano.9.232

• nanocellulose surfaces can improve their function as magnetite-based adsorbents for arsenic removal. It is proven that amino groups accessible for iron coordination result in a larger number of adsorption sites on the nanocellulose surface as compared to MFC. In addition, nanocellulose has also been proposed as

ZnO-nanostructure-based electrochemical sensor: Effect of nanostructure morphology on the sensing of heavy metal ions

• Marina Krasovska,
• Vjaceslavs Gerbreders,
• Irena Mihailova,
• Andrejs Ogurcovs,
• Eriks Sledevskis,
• Andrejs Gerbreders and
• Pavels Sarajevs

Beilstein J. Nanotechnol. 2018, 9, 2421–2431, doi:10.3762/bjnano.9.227

• water or water vapour results in the formation of negatively charged hydroxy (OH−) groups, which can themselves act as new adsorption sites on the ZnO surface. The adsorption mechanism is based on the interaction of positively charged metallic ions with negatively charged hydroxy groups on the ZnO

Electrospun one-dimensional nanostructures: a new horizon for gas sensing materials

• Muhammad Imran,
• Nunzio Motta and
• Mahnaz Shafiei

Beilstein J. Nanotechnol. 2018, 9, 2128–2170, doi:10.3762/bjnano.9.202

• semiconductor surface adsorption sites, enhancing oxygen adsorption at the grain surface, leading to improvement in the sensing response. The Pt catalyst also may cause an increase in the response. As the temperature increases up to 500 °C, the response decreases. A response time of 1 s for a 0.08 wt % Pt-doped

Synthesis of carbon nanowalls from a single-source metal-organic precursor

• André Giese,
• Sebastian Schipporeit,
• Volker Buck and
• Nicolas Wöhrl

Beilstein J. Nanotechnol. 2018, 9, 1895–1905, doi:10.3762/bjnano.9.181

• surface. Surface diffusion can generally be considered as particles moving between adjacent adsorption sites on a surface. This motion strongly depends on the energy of the particle at the surface, typically increasing with increasing temperature, as well as on the various surface properties influencing

Improving the catalytic activity for hydrogen evolution of monolayered SnSe_2(1−x)S_2x by mechanical strain

• Sha Dong and
• Zhiguo Wang

Beilstein J. Nanotechnol. 2018, 9, 1820–1827, doi:10.3762/bjnano.9.173

• agree with the reported by Huang et al. [36] with random SnSe2(1−x)S2x alloys. The bandgap evolution of monolayer SnSe2(1−x)S2x shows a band-bowing effect [36]. There are three possible adsorption sites for hydrogen on pristine SnS2 and SnSe2 monolayers, i.e., the top of the Sn site, the centre of a

• hexagonal site, and the top of S/Se atoms. Because of the symmetry breaking in SnSe2(1−x)S2x monolayers, the number of possible adsorption sites is increased. For example, there are six adsorption sites for hydrogen on the SnSeS monolayer, as shown in Figure 2, i.e., the top of S (TS) and Se (TSe) atoms

• energetically stable adsorption sites for hydrogen, which will be relaxed to near the S or Se atoms. Thus, we considered the sites on top of the S and Se atoms as adsorption sites for hydrogen in the following part of this paper. The Gibbs free energies of hydrogen adsorption on the basal plane of the monolayer

SO₂ gas adsorption on carbon nanomaterials: a comparative study

• Deepu J. Babu,
• Divya Puthusseri,
• Frank G. Kühl,
• Sherif Okeil,
• Michael Bruns,
• Manfred Hampe and
• Jörg J. Schneider

Beilstein J. Nanotechnol. 2018, 9, 1782–1792, doi:10.3762/bjnano.9.169

• due to the parallel stacking on CNTs in such VACNT bundles, on the groove sites present at the intersection of two CNTs, as well as on the outer periphery [28]. These different adsorption sites vary in their adsorption energies due to the difference in the coordination number of carbon atoms and

• curvature effects [28][29]. The presence of these multiple well-defined and reproducible adsorption sites makes VACNTs an ideal model structure for investigating and understanding gas adsorption in one-dimensional carbon materials. In our previous works, we have shown the successful application of VACNTs as

• and SWNTs lie on the same line while VACNTs exhibits a higher SO2 adsorption capacity. The SO2 uptake of Norit R1 Extra is no longer in line with the specific surface at a pressure of 3 bar. This is because, unlike other adsorbents, all the microporous adsorption sites of Norit R1 Extra are already

Free-radical gases on two-dimensional transition-metal disulfides (XS₂, X = Mo/W): robust half-metallicity for efficient nitrogen oxide sensors

• Chunmei Zhang,
• Yalong Jiao,
• Fengxian Ma,
• Sri Kasi Matta,
• Steven Bottle and
• Aijun Du

Beilstein J. Nanotechnol. 2018, 9, 1641–1646, doi:10.3762/bjnano.9.156

• NOx onto MoS2, indicating highly thermal stability.” Conclusion We have presented monolayer XS2 (X = Mo, W) as NO sensor based on first principles studies. The adsorption sites and energy for NO and NO2 molecules on MoS2 or WS2 layers have been studied. The calculations were carried out with different

CdSe nanorod/TiO₂ nanoparticle heterojunctions with enhanced solar- and visible-light photocatalytic activity

• Fakher Laatar,
• Hatem Moussa,
• Halima Alem,
• Lavinia Balan,
• Emilien Girot,
• Ghouti Medjahdi,
• Hatem Ezzaouia and
• Raphaël Schneider

Beilstein J. Nanotechnol. 2017, 8, 2741–2752, doi:10.3762/bjnano.8.273

• mg of photocatalyst. As expected, the photocatalytic degradation rates increased with the catalyst dosage, which is linked to the concentration of adsorption sites and photocatalytically active sites (k = 0.010, 0.019 and 0.034 min−1 for reactions conducted with 25, 50 and 100 mg of photocatalyst

Ab initio study of adsorption and diffusion of lithium on transition metal dichalcogenide monolayers

• Xiaoli Sun and
• Zhiguo Wang

Beilstein J. Nanotechnol. 2017, 8, 2711–2718, doi:10.3762/bjnano.8.270

• ][33][47], MoX2 [33][40][47][50][51][52][53][54][55], HfX2 [33][47] and WX2 [33][40][47][50][55][56][57][58]. The metallic MX2 monolayers have good electrical conductivity, which may make them good anode materials. As shown in Figure 3a and Figure 3b, there are two stable adsorption sites, that is, the

• hollow site (H) and the top position above the M atom (T) for Li to be adsorbed on the 2H- and 1T-MX2 monolayers [18]. Four adsorption sites (T1, T2, H1, and H2) are considered for Li adsorption onto the 1T'-MX2 monolayer, as shown in Figure 3c. To analyse the stability of Li adsorbed on the MX2

• views of ball and stick models of a MX2 monolayer in (a) 2H, (b) 1T and (c) 1T' phase. The M atoms have octahedral and trigonal prismatic coordination in the 1T/1T' and 2H phase, respectively. Band structures of MX2 monolayers in the stable phase. Fermi energy level is set to be 0. Possible adsorption

Adsorption of iron tetraphenylporphyrin on (111) surfaces of coinage metals: a density functional theory study

• Hao Tang,
• Nathalie Tarrat,
• Véronique Langlais and
• Yongfeng Wang

Beilstein J. Nanotechnol. 2017, 8, 2484–2491, doi:10.3762/bjnano.8.248

• vacuum disappears upon adsorption on the metal surfaces. The high-spin state of physisorbed FeTPP is stable on all adsorption sites. This result reveals that an external permanent element such as a STM tip or an additional molecule is needed to use FeTPP or similar molecules as model system for molecular

• state, which will be used as reference for the total energy comparison from now on. At the three other adsorption sites (hollow-hcp, top and bridge), the energy is higher by 0.04 eV. The magnetic moment of HS state is 4.18 ± 0.05 μB for these four sites. At hollow-fcc, the IS state energy is found to be

Modelling focused electron beam induced deposition beyond Langmuir adsorption

• Dédalo Sanz-Hernández and
• Amalio Fernández-Pacheco

Beilstein J. Nanotechnol. 2017, 8, 2151–2161, doi:10.3762/bjnano.8.214

• regimes described by the ML model (a, b, c), compared with the Langmuir model (d), under same conditions. The system was solved using v1 = vGAS = 1, ve = 0.04. Solutions are represented on a test surface with 45 adsorption sites. FEBID maps representing growth rate (contours) and adsorbate concentration

α-Silicene as oxidation-resistant ultra-thin coating material

• Ali Kandemir,
• Fadil Iyikanat,
• Cihan Bacaksiz and
• Hasan Sahin

Beilstein J. Nanotechnol. 2017, 8, 1808–1814, doi:10.3762/bjnano.8.182

• demonstrated as protective material from oxidation. In particular, large binding energies between a single oxygen atom and silicene were calculated for the possible adsorption sites. This strong interaction can break the oxygen–oxygen bond as well. Moreover, the energy barriers for the oxygen atom between

Adsorption and diffusion characteristics of lithium on hydrogenated α- and β-silicene

• Fadil Iyikanat,
• Ali Kandemir,
• Cihan Bacaksiz and
• Hasan Sahin

Beilstein J. Nanotechnol. 2017, 8, 1742–1748, doi:10.3762/bjnano.8.175

• the total energy of single-layer hydrogenated silicene and two-layer Ag(111). N is the number of total atoms contained in the unit cell. Binding energies were calculated for the most favorable adsorption sites. Binding energies of the Li atom were calculated by using the formula where Ebind is the

• H atoms, the nearest adsorption site to 6Si is 2H. It is reasonable to assume that Li atoms diffuse through these two favorable adsorption sites. The diffusion barrier of a Li atom between these two nearest binding sites is 768 meV. However, once the Li atom overcomes the energy barrier, its

• adsorption sites is most likely. The diffusion barrier of a Li atom on H-β-Si is 411 meV. Therefore, the energy barrier for the Li atom on H-β-Si is almost half of that on H-α-Si. As can be seen from Figure 3c, the 2HT′ site is the energetically most favorable site for the second Li atom on H-β-Si. The

Adsorption and electronic properties of pentacene on thin dielectric decoupling layers

• Sebastian Koslowski,
• Daniel Rosenblatt,
• Alexander Kabakchiev,
• Klaus Kuhnke,
• Klaus Kern and
• Uta Schlickum

Beilstein J. Nanotechnol. 2017, 8, 1388–1395, doi:10.3762/bjnano.8.140

• 50 mV at a frequency of 832 Hz. a) STM topography image of pentacene on h-BN (U = −1 V, I = 50 pA). b) Large-scale STM topography image of pentacene on h-BN. The white circles indicate the preferential adsorption sites illustrated in the inset. Inset: Illustration of the six possible pentacene

Hierarchically structured nanoporous carbon tubes for high pressure carbon dioxide adsorption

• Julia Patzsch,
• Deepu J. Babu and
• Jörg J. Schneider

Beilstein J. Nanotechnol. 2017, 8, 1135–1144, doi:10.3762/bjnano.8.115

• high temperature treatment from lesser graphitic-like material. The growth of these sp² zones leads to a decrease of open adsorption sites and leads to an obstruction of former micropores. Characterization of silicon carbide tubes (5) Figure 7 shows TEM images of the silicon carbide tubes (5) and the

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

• chosen at bias voltages of 0.826 V and −1.181 V reveal a bright-dark pattern on the monolayer coinciding with the interfacial reconstruction. Regions where the Au(111)-interface is considered to be of fcc termination appear darker in Figure 5b whereas the hcp adsorption sites are imaged brighter. Figure

• (blue). The rigid downward shift of the molecular derived states at the fcc adsorption sites could be assigned to a more pronounced pillow effect [24][25][26]. The influence of the interface dipole which appears stronger in the fcc regions led to a further reduction of the Au(111)-work-function

• accompanied by a reduction of the electron injection barrier. Furthermore, fcc-spectrums LUMO derived peak obviously exhibit a more pronounced broadening. Thus, a stronger adsorbate-substrate-interaction of the fullerenes on the fcc adsorption sites is suggested, leading to a higher degree of hybridization

High photocatalytic activity of Fe₂O₃/TiO₂ nanocomposites prepared by photodeposition for degradation of 2,4-dichlorophenoxyacetic acid

• Shu Chin Lee,
• Hendrik O. Lintang and
• Leny Yuliati

Beilstein J. Nanotechnol. 2017, 8, 915–926, doi:10.3762/bjnano.8.93

• obtained with increasing Fe/Ti ratio, suggesting that the adsorption sites were not covered by the deposition of Fe2O3. Figure 2B shows the photocatalytic performance of the TiO2 and the Fe2O3/TiO2 (PD) nanocomposites after the exclusion of the 2,4-D adsorption. No significant difference in the activity

Triptycene-terminated thiolate and selenolate monolayers on Au(111)

• Jinxuan Liu,
• Martin Kind,
• Björn Schüpbach,
• Daniel Käfer,
• Stefanie Winkler,
• Wenhua Zhang,
• Andreas Terfort and
• Christof Wöll

Beilstein J. Nanotechnol. 2017, 8, 892–905, doi:10.3762/bjnano.8.91

• , indicating a monolayer with only one adsorption site (or adsorption sites with equal binding energies), and a low defect density. Comparison to the Trp1Se SAM reveals an important difference: Here the appearance of Trp1Se+ fragments points to an additional desorption channel with cleavage of the gold