A dioxaborine cyanine dye as a photoluminescence probe for sensing carbon nanotubes

• Mohammed Al Araimi,
• Petro Lutsyk,
• Anatoly Verbitsky,
• Yuri Piryatinski,
• Mykola Shandura and
• Aleksey Rozhin

Beilstein J. Nanotechnol. 2016, 7, 1991–1999, doi:10.3762/bjnano.7.190

• ) chiralities SWNT is more efficient than the RET for the (8,4) chirality. Thus, we can well discriminate the excitation peaks from excitonic levels of SWNTs and the RET from the dye complexed to the SWNT, where the RET has maximum at λEX = 735 nm. Finally, the ageing of the mixtures affects severely the

• = 720 nm) is quenched down to about a third for both the as-prepared (Figure 5a,c) and the aged (Figure 5b,d) mixtures. The quenching of the monomeric peak due to the ageing is almost the same (down to about a half) for the neat dye (Figure 5a,b) and for the mixtures with the SWNT (Figure 5c,d

• ). Importantly, the PL intensity of the band at λEX = 575 nm and λEM = 680 nm (resulted from the hydrolysis of dioxaborine cycle) does not change significantly after ageing of the mixture (Figure 5c,d). As it has been discussed before, in the neat dye the same band grew about four-fold during the ageing process

Role of solvents in the electronic transport properties of single-molecule junctions

• Katharina Luka-Guth,
• Sebastian Hambsch,
• Andreas Bloch,
• Philipp Ehrenreich,
• Bernd Michael Briechle,
• Filip Kilibarda,
• Torsten Sendler,
• Dmytro Sysoiev,
• Thomas Huhn,
• Artur Erbe and
• Elke Scheer

Beilstein J. Nanotechnol. 2016, 7, 1055–1067, doi:10.3762/bjnano.7.99

• is known that in Mes contacts with a conductance of G ≈ 0.1G0 and with G ≈ 0.03G0 may form [18][19]. This effect appears more frequently upon ageing of the samples and is therefore attributed to the increasing water content with time [45]. Contamination with water would also explain the appearance of

Surfactant-controlled composition and crystal structure of manganese(II) sulfide nanocrystals prepared by solvothermal synthesis

• Elena Capetti,
• Anna M. Ferretti,
• Vladimiro Dal Santo and
• Alessandro Ponti

Beilstein J. Nanotechnol. 2015, 6, 2319–2329, doi:10.3762/bjnano.6.238

• ) in an octadecene solution of Mn precursor, S, and (possibly) surfactant, and finally, ageing for 1 h before cooling and isolating the resulting NCs. MnO vs MnS: The role of sulfur and surfactant As anticipated in the Introduction, it was observed that when MnOl(OH) or MnOl2 (Ol - oleate) was

• evidence that MnOxS1−x NCs formed despite that both MnO and α-MnS have a rock salt structure. We investigated a wide range of ageing times (30–180 min) and such a NC mixture was obtained in all cases, showing that interconversion of MnO and α-MnS NCs during ageing did not occur. Both of these findings are

Mechanical properties of MDCK II cells exposed to gold nanorods

• Anna Pietuch,
• Bastian Rouven Brückner,
• David Schneider,
• Marco Tarantola,
• Christina Rosman,
• Carsten Sönnichsen and
• Andreas Janshoff

Beilstein J. Nanotechnol. 2015, 6, 223–231, doi:10.3762/bjnano.6.21

• Anna Pietuch Bastian Rouven Bruckner David Schneider Marco Tarantola Christina Rosman Carsten Sonnichsen Andreas Janshoff Institute of Physical Chemistry, Tammannstr. 6, University of Goettingen, 37077 Goettingen, Germany Max Planck Institute for Biology of Ageing, Joseph-Stelzmann-Strasse 9b

Mammalian cell growth on gold nanoparticle-decorated substrates is influenced by the nanoparticle coating

• Christina Rosman,
• Sebastien Pierrat,
• Marco Tarantola,
• David Schneider,
• Eva Sunnick,
• Andreas Janshoff and
• Carsten Sönnichsen

Beilstein J. Nanotechnol. 2014, 5, 2479–2488, doi:10.3762/bjnano.5.257

• Planck Institute for Biology of Ageing, Joseph-Stelzmann-Straße 9b, 50931 Cologne, Germany 10.3762/bjnano.5.257 Abstract In this work, we study epithelial cell growth on substrates decorated with gold nanorods that are functionalized either with a positively charged cytotoxic surfactant or with a

Advances in NO₂ sensing with individual single-walled carbon nanotube transistors

• Kiran Chikkadi,
• Matthias Muoth,
• Cosmin Roman,
• Miroslav Haluska and
• Christofer Hierold

Beilstein J. Nanotechnol. 2014, 5, 2179–2191, doi:10.3762/bjnano.5.227

• previous studies are present only when the nanotube is in contact with a substrate such as SiO2. Drift and low-frequency noise Drift of a sensor may have several origins, related to the ageing of the device, changes in materials properties over time, or ultra-low frequency noise. For example, if a

Structural, optical and photocatalytic properties of flower-like ZnO nanostructures prepared by a facile wet chemical method

• Sini Kuriakose,
• Neha Bhardwaj,
• Jaspal Singh,
• Biswarup Satpati and
• Satyabrata Mohapatra

Beilstein J. Nanotechnol. 2013, 4, 763–770, doi:10.3762/bjnano.4.87

• ) as compared to ZnO nanoparticles. XRD, UV–vis absorption, PL, FTIR and TEM studies revealed the formation of Zn(OH)2 surface layer on ZnO nanostructures upon ageing. We demonstrate that the formation of a passivating Zn(OH)2 surface layer on the ZnO nanostructures upon ageing deteriorates their

• efficiency to photocatalytically degrade of MB. Keywords: ageing; nanoparticles; nanosheets; photocatalysis; ZnO; Introduction Water contamination due to hazardous water soluble organic dyes and chemicals poses a severe threat to the environment. The excess azo dyes in effluents from textile and dyeing

• (MB) in 60 min. ZnO nanoparticles (NP) that were synthesized by wet chemical methods can be passivated by a Zn(OH)2 layer during ageing. Hong et al. [35] have shown that the photocatalytic activity of ZnO NP is drastically reduced when the is surface modified with polysterene. In this paper, we have

Ultraviolet photodetection of flexible ZnO nanowire sheets in polydimethylsiloxane polymer

• Jinzhang Liu,
• Nunzio Motta and
• Soonil Lee

Beilstein J. Nanotechnol. 2012, 3, 353–359, doi:10.3762/bjnano.3.41

• block the UV light. Moreover, carbon-based polymers undergo oxidation with ageing, and the degradation could be expedited by the absorption of UV light. In this paper, we report results of experiments on UV photodetectors based on a thin sheet of ZnO nanowires embedded in polydimethylsiloxane (PDMS

• due to ageing. The surface Ag2O layer, a narrow bandgap semiconductor, added an extra barrier for electrons flowing between Ag nanoparticles and ZnO nanowires, resulting in the nonlinear I–V curves in Figure 3a. The I–V curve of the device in PDMS measured in the dark, plotted in the insert in Figure

Template-assisted formation of microsized nanocrystalline CeO₂ tubes and their catalytic performance in the carboxylation of methanol

• Jörg J. Schneider,
• Meike Naumann,
• Christian Schäfer,
• Armin Brandner,
• Heiko J. Hofmann and
• Peter Claus

Beilstein J. Nanotechnol. 2011, 2, 776–784, doi:10.3762/bjnano.2.86

• and characterization of hierarchical microsized nanocrystalline ceria fibre mats Formation of ceria tubes without surfactant Ceria tubes were prepared by an exotemplating technique. After controlled ageing of a sol-precursor solution prepared from cerium ammonium nitrate (NH4)2Ce(NO3)6 in water and

Inorganic–organic hybrid materials through post-synthesis modification: Impact of the treatment with azides on the mesopore structure

• Miriam Keppeler,
• Jürgen Holzbock,
• Johanna Akbarzadeh,
• Herwig Peterlik and
• Nicola Hüsing

Beilstein J. Nanotechnol. 2011, 2, 486–498, doi:10.3762/bjnano.2.52

• sorption analysis. Similar effects were observed for unmodified silica gels by simple ageing in azide-containing media, whether a relatively small or a sterically demanding counter ion (Na+ or (H3C)4N+) was used. The structural modification did not seem to depend greatly on whether an organic aprotic

• [18]. Each of these strategies allows for a high level of control over macropore/mesopore size distribution, surface area, etc. It is well known that ageing of silica gels in different environments or in hydrothermal conditions has a pronounced influence on the final gel structure [19][20]. Ageing at

• . Simple ageing of unmodified mesoscopically organized silica gels in azide-containing media allows us to demonstrate that the observed effects are not due to the inserted azide-functionalities, which are covalently attached to the silica surface, but rather to an exposure of a mesostructured silica matrix