Highly ordered mesoporous silica film nanocomposites containing gold nanoparticles for the catalytic reduction of 4-nitrophenol

• Mohamad Azani Jalani,
• Leny Yuliati,
• Siew Ling Lee and
• Hendrik O. Lintang

Beilstein J. Nanotechnol. 2019, 10, 1368–1379, doi:10.3762/bjnano.10.135

• ; Introduction Mesoporous silica nanomaterials with pore size between 2 to 50 nm [1] have been recently applied to the development of biomedical adsorbents [2][3][4], drug delivery systems [5][6][7], catalysts [8][9][10], as well as supports for metal nanoparticles [11][12][13] due to their large surface area

• the performance for the above-mentioned applications, it is crucial to find a method for template removal. As a host for metal nanoparticles, mesoporous matrixes have been extensively used for the controlled growth of gold nanoparticles (AuNPs) [11][19]. For mesoporous silica, gold sources derived

A silver-nanoparticle/cellulose-nanofiber composite as a highly effective substrate for surface-enhanced Raman spectroscopy

• Yongxin Lu,
• Yan Luo,
• Zehao Lin and
• Jianguo Huang

Beilstein J. Nanotechnol. 2019, 10, 1270–1279, doi:10.3762/bjnano.10.126

• and biological substances where the substrates are crucial for obtaining an enhanced Raman signal [43][44][45]. The Raman signal of SERS is enhanced remarkably in the “hot spots” that are generated in the nanogaps of plasmonic metal nanoparticles (e.g., Au, Ag and Cu) through the amplification of the

• which the metal nanoparticles are deposited influences both the collection efficiencies and detection sensitivities. Cellulose, such as laboratory filter paper and bacterial nanocellulose, have been considered as superior candidates for the fabrication of SERS substrates with silver nanoparticles, due

Alloyed Pt₃M (M = Co, Ni) nanoparticles supported on S- and N-doped carbon nanotubes for the oxygen reduction reaction

• Stéphane Louisia,
• Yohann R. J. Thomas,
• Pierre Lecante,
• Marie Heitzmann,
• M. Rosa Axet,
• Pierre-André Jacques and
• Philippe Serp

Beilstein J. Nanotechnol. 2019, 10, 1251–1269, doi:10.3762/bjnano.10.125

• reaction (ORR) have been evaluated in a rotating ring disk electrode experiment. The Pt3M/N-CNT catalysts revealed excellent electrochemical properties compared to a commercial Pt3Co/Vulcan XC-72 catalyst. The nature of the carbon support plays a key role in determining the properties of the metal

• nanoparticles, on the preparation of the catalytic layer, and on the electrocatalytic performance in the ORR. On N-CNT supports, the specific activity followed the expected order Pt3Co > Pt3Ni, whereas on the annealed N-CNT support, the order was reversed. Keywords: carbon nanotubes; cobalt; ionic liquid

Enhanced inhibition of influenza virus infection by peptide–noble-metal nanoparticle conjugates

• Zaid K. Alghrair,
• David G. Fernig and
• Bahram Ebrahimi

Beilstein J. Nanotechnol. 2019, 10, 1038–1047, doi:10.3762/bjnano.10.104

• exert its antiviral activity from the outside of the cell. Thus, the addition of FluPep to cells in culture prevents infection by influenza viruses, as does intranasal delivery of the peptide in a murine model of human influenza [15]. Noble-metal nanoparticles possess a strong plasmon absorbance, which

• allows for the detection at very low levels, using a range of approaches, from absorbance [17][18] to photothermal microscopy [19] and various extensions of the latter [20][21]. Noble-metal nanoparticles can be passivated and functionalised with biomolecules such that they possess the biological

• biological activity of the peptide, for example, due to multivalent functionalisation of the nanoparticles. In addition, silver possesses innate antimicrobial activities [25]. Thus, noble-metal nanoparticles are potentially useful as both functional probes for antiviral peptides and as therapeutic delivery

Features and advantages of flexible silicon nanowires for SERS applications

• Hrvoje Gebavi,
• Vlatko Gašparić,
• Dubravko Risović,
• Nikola Baran,
• Paweł Henryk Albrycht and
• Mile Ivanda

Beilstein J. Nanotechnol. 2019, 10, 725–734, doi:10.3762/bjnano.10.72

• , preferably with clusters of metal nanoparticles, sharp edges and tips, are the key to strong electromagnetic enhancement ranging from 1010 to 1014 [3]. If the values of Raman cross section of the analyte and of SERS enhancement are appropriate, even single-molecule detection is possible. For example, under

• factor increases approximately as d−8 in the case of two metal nanoparticles with the polarization along the particle axis, which can be roughly applied to the case of two nanowires. However, in the reported substrates SiNWs are randomly oriented and the polarization measurement was not tested in detail

Deposition of metal particles onto semiconductor nanorods using an ionic liquid

• Michael D. Ballentine,
• Elizabeth G. Embry,
• Marco A. Garcia and
• Lawrence J. Hill

Beilstein J. Nanotechnol. 2019, 10, 718–724, doi:10.3762/bjnano.10.71

• potential to impact a number of applications [1][2][3][4]. Deposition of metal nanoparticles onto the nanorod surface competes with homogeneous nucleation of the metal nanoparticles, with the size and number of metal nanoparticles attached to each nanorod controlled by lattice matching of the materials and

• using gold. Conclusion In conclusion, we have demonstrated that deposition of noble metal nanoparticles onto CdSe@CdS nanorods is possible using the ionic liquid [bmim][Tf2N] without the need for additional surfactants or reducing agents. These procedures resulted in heterostructured particles with

Enhancement in thermoelectric properties due to Ag nanoparticles incorporated in Bi₂Te₃ matrix

• Srashti Gupta,
• Dinesh Chandra Agarwal,
• Bathula Sivaiah,
• Sankarakumar Amrithpandian,
• Kandasami Asokan,
• Ajay Dhar,
• Binaya Kumar Panigrahi,
• Devesh Kumar Avasthi and
• Vinay Gupta

Beilstein J. Nanotechnol. 2019, 10, 634–643, doi:10.3762/bjnano.10.63

• enhancement of the Seebeck coefficient for a given carrier concentration. Several groups have used this approach using different metal–semiconductor combinations to improve thermoelectric properties [13][14]. One group has reported the synthesis of bismuth metal nanoparticles (NPs) were through a solvothermal

• investigation of Ag in a Bi2Te3 matrix while focusing on an easy, reproducible low-cost synthesis suitable for scale-up. We show how to tune S and σ independently to achieve high S2σ values. One objective is to see which fraction of metal nanoparticles is required for the TE enhancement of a Bi2Te3 matrix and

Hydrophilicity and carbon chain length effects on the gas sensing properties of chemoresistive, self-assembled monolayer carbon nanotube sensors

• Juan Casanova-Cháfer,
• Carla Bittencourt and
• Eduard Llobet

Beilstein J. Nanotechnol. 2019, 10, 565–577, doi:10.3762/bjnano.10.58

• MWCNTs decorated with Au nanoparticles were analyzed by TEM in order to observe the distribution of metal nanoparticles on the carbon nanotubes. Figure 1 shows that the CNT sidewalls are densely and quite homogeneously decorated with Au nanoparticles (Table S1 in Supporting Information File 1 shows

Mo-doped boron nitride monolayer as a promising single-atom electrocatalyst for CO₂ conversion

• Qianyi Cui,
• Gangqiang Qin,
• Weihua Wang,
• Lixiang Sun,
• Aijun Du and
• Qiao Sun

Beilstein J. Nanotechnol. 2019, 10, 540–548, doi:10.3762/bjnano.10.55

• because it can take place at room temperature and atmospheric pressure with useful catalysts, making it feasible for extensive application and integration [12][13][14]. Metal nanoparticles supported on various substrates have been extensively investigated as heterogeneous catalysts in many reactions [10

• ][15][16][17]. Over the past few decades, researchers have focused on decreasing the size of metal nanoparticles in order to improve the surface area/volume ratio of low-coordinated metal atoms in order to enhance the selectivity toward specific species and to improve the electrocatalytic performance

Electromagnetic analysis of the lasing thresholds of hybrid plasmon modes of a silver tube nanolaser with active core and active shell

• Denys M. Natarov,
• Trevor M. Benson and
• Alexander I. Nosich

Beilstein J. Nanotechnol. 2019, 10, 294–304, doi:10.3762/bjnano.10.28

• of publications have dealt with the modeling of nanolasers based on metal nanoparticles and nanowires equipped with active cores or shells [4][5][6][7][8][9]. Note that in [4], the authors studied the effect of a metal tube on the lowest-order modes of the active core while the presence of the

• plasmon modes of the tube itself was neglected. More recently, the attention of researchers became focused on lasing in periodic arrays of metal nanoparticles supported by or immersed into an active layer [10][11][12][13] or with other active region configurations [14]. In this paper, we explore the modes

Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

• Alexander Rostek,
• Marina Breisch,
• Kevin Pappert,
• Kateryna Loza,
• Marc Heggen,
• Manfred Köller,
• Christina Sengstock and
• Matthias Epple

Beilstein J. Nanotechnol. 2018, 9, 2763–2774, doi:10.3762/bjnano.9.258

• determine the effect of particle exposure on the viability of human mesenchymal stem cells (hMSCs). Except for silver, no adverse effect of any of the metal nanoparticles was observed for concentrations up to 50 ppm (50 mg L−1) incubated for 24 h, indicating that noble metal nanoparticles (rhodium

• , and nanomedicine [1][2][3]. Noble metal nanoparticles are of particular importance due to their diverse properties such as surface plasmon resonance, chemical inertness, and antibacterial action (silver) [4][5][6][7][8][9]. However, concerns have been raised with respect to their biological effect

• after unintended exposure [10][11][12][13][14]. Noble metal nanoparticles such as Au, Pt, Pd, and Rh have distinct catalytic properties in biology, and have been reported to show several enzyme-like activities in vitro, including reactive oxygen species scavenger activity [15][16][17][18][19][20][21][22

Enhancement of X-ray emission from nanocolloidal gold suspensions under double-pulse excitation

• Wei-Hung Hsu,
• Frances Camille P. Masim,
• Armandas Balčytis,
• Hsin-Hui Huang,
• Tetsu Yonezawa,
• Aleksandr A. Kuchmizhak,
• Saulius Juodkazis and
• Koji Hatanaka

Beilstein J. Nanotechnol. 2018, 9, 2609–2617, doi:10.3762/bjnano.9.242

• -absorption efficiency and an enhanced generation of high-energy electrons from a highly ionized plasma with high electron temperature [10][11] under intense laser irradiation. For an efficient augmentation in X-ray intensity, femtosecond (fs)-laser excitation of metal nanoparticles and nanoclusters is of

Au–Si plasmonic platforms: synthesis, structure and FDTD simulations

• Anna Gapska,
• Marcin Łapiński,
• Paweł Syty,
• Wojciech Sadowski,
• Józef E. Sienkiewicz and
• Barbara Kościelska

Beilstein J. Nanotechnol. 2018, 9, 2599–2608, doi:10.3762/bjnano.9.241

• concluded that the proposed method of manufacturing nanostructures yields good results. Of course, there are also other methods for the production of nanostructures or metal nanoparticles, for example laser irradiation of thin metallic films deposited on various substrates [29][30][31][32][33]. This method

High-throughput micro-nanostructuring by microdroplet inkjet printing

• Hendrikje R. Neumann and
• Christine Selhuber-Unkel

Beilstein J. Nanotechnol. 2018, 9, 2372–2380, doi:10.3762/bjnano.9.222

• densities is highly important in many fields, ranging from nano-optics to biosensor technologies and biomaterials. A well-established method to fabricate quasi-hexagonal patterns of metal nanoparticles is block copolymer micelle nanolithography, which relies on the self-assembly of metal-loaded micelles on

• nanoparticle structures is dip-pen nanolithography [7]. Although all these methods are highly precise, it would be expensive and time consuming to use them to coat large areas on the centimeter scale. A convenient, high-throughput method to achieve hexagonal patterns of metal nanoparticles with a well-defined

The role of adatoms in chloride-activated colloidal silver nanoparticles for surface-enhanced Raman scattering enhancement

• Nicolae Leopold,
• Andrei Stefancu,
• Krisztian Herman,
• István Sz. Tódor,
• Stefania D. Iancu,
• Vlad Moisoiu and
• Loredana F. Leopold

Beilstein J. Nanotechnol. 2018, 9, 2236–2247, doi:10.3762/bjnano.9.208

• the order of 106–107 for isolated metal nanoparticles [8]. The chemical mechanism of Raman signal enhancement is based on a metal–molecule electronic transition [8][12]. The electronic coupling of the molecule with the metal surface of the nanoparticle leads to a significant increase in the Raman

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

• (e.g., polypyrrole (PPy), polyaniline (PANI), polythiophene (PTh) and their derivatives) [32][87][88][90], MOx nanofibers surface functionalized by metal nanoparticles [75] and graphene sheets incorporated with MOx nanofibers [89]. 4.1 Conductometric gas sensors Nanostructure-based conductometric

Self-assembled quasi-hexagonal arrays of gold nanoparticles with small gaps for surface-enhanced Raman spectroscopy

• Emre Gürdal,
• Simon Dickreuter,
• Fatima Noureddine,
• Pascal Bieschke,
• Dieter P. Kern and
• Monika Fleischer

Beilstein J. Nanotechnol. 2018, 9, 1977–1985, doi:10.3762/bjnano.9.188

• . A combination of micellar nanolithography and electroless deposition (ED) enables the tuning of the spacing and size of the noble metal nanoparticles. Long-range ordered quasi-hexagonal arrays of gold nanoparticles on silicon substrates with a variation of the particle sizes from about 20 nm to 120

• lithography; optical antenna; self-assembly; SERS; Introduction Over the last decades self-assembled layers of gold nanoparticles have taken an important role in emerging nanotechnologies. Noble metal nanoparticles show localized surface plasmon polariton resonances (LSPRs) in the visible and infrared

• remarkable optical properties make them attractive for applications in biosensing, biomedical science and as optical antennas [6][7][8]. In particular, metal nanoparticles can be employed to strongly enhance the signal intensity in chemically specific Raman sensing [9]. This technique is known as surface

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

• ([BMIm][BF4]), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIm][NTf2]) and in propylene carbonate (PC) yield oxide-free rare-earth metal nanoparticles (RE-NPs) in [BMIm][NTf2] and PC for RE = Pr, Gd and Er or rare-earth metal-fluoride nanoparticles (REF3-NPs) in the fluoride-donating

• diameters of (1.5 ± 0.5) to (5 ± 1) nm. The characterization was completed by energy-dispersive X-ray spectroscopy (EDX). Keywords: ionic liquids; metal amidinates; rare-earth metal-fluoride nanoparticles; rare-earth metal nanoparticles; soft wet-chemical synthesis; Introduction Rare-earth (RE) elements

• general metal-fluoride nanoparticles, are important in materials science and modern chemistry [21][22]. However, in the absence of fluoride donors we obtained oxide-free rare-earth metal nanoparticles (RE-NPs) of Pr, Gd and Er (Scheme 1). By using either the chemically more inert IL 1-butyl-3

Synthesis of hafnium nanoparticles and hafnium nanoparticle films by gas condensation and energetic deposition

• Irini Michelakaki,
• Nikos Boukos,
• Dimitrios A. Dragatogiannis,
• Spyros Stathopoulos,
• Costas A. Charitidis and
• Dimitris Tsoukalas

Beilstein J. Nanotechnol. 2018, 9, 1868–1880, doi:10.3762/bjnano.9.179

• nanoparticles is reported for the first time in the literature. Keywords: energetic deposition; hafnium; inert-gas condensation; nanomechanical properties; nanoparticles; nanoparticle thin films; Introduction In the past decades, the interest in and the exploitation of metal nanoparticles (NPs) spread across

• . While for face-centered (fcc) metal NPs a lot of studies have been made [14][15][16], the knowledge regarding hexagonal close-packed (hcp) metal nanoparticles, despite their interesting properties, is limited. Some examples of hcp nanoparticles reported in bibliography are ruthenium NPs, which

• have already excluded oxidation in the aggregation zone, there is no physical reason why there should be oxidation within the deposition chamber where the pressure is lower than within the aggregation zone. The distinct core–shell structure is typical of most metal nanoparticles when exposed to air at

Uniform cobalt nanoparticles embedded in hexagonal mesoporous nanoplates as a magnetically separable, recyclable adsorbent

• Can Zhao,
• Yuexiao Song,
• Tianyu Xiang,
• Wenxiu Qu,
• Shuo Lou,
• Xiaohong Yin and
• Feng Xin

Beilstein J. Nanotechnol. 2018, 9, 1770–1781, doi:10.3762/bjnano.9.168

• number of researches have demonstrated that carbon-based nanocomposites can serve as effective adsorbents for wastewater purification [6][7][8][9]. The introduction of transition metal nanoparticles into a mesoporous carbon matrix to form transition-metal-loaded mesoporous carbon nanocomposites (TM-MCNs

• composition [18][19]. They are a typical class of inorganic lamellar clays with dual-metal cations (e.g., CoAl) and anions or guest molecules within the interlayer region. The reduction of metal cations uniformly distributed in the lattice of LDHs by reducing agents to form well-dispersed metal nanoparticles

• in their framework has become a quite possible strategy for introduction of metal nanoparticles onto the support. The metal cations might migrate across the interlayer space during the thermal reduction process at high temperature due to the weak van der Waals forces between the interlayer of the LDH

Atomistic modeling of tribological properties of Pd and Al nanoparticles on a graphene surface

• Alexei Khomenko,
• Miroslav Zakharov,
• Denis Boyko and
• Bo N. J. Persson

Beilstein J. Nanotechnol. 2018, 9, 1239–1246, doi:10.3762/bjnano.9.115

• canonical ensemble and account for numerical and round errors. Results and Discussion We have performed MD calculations for the sliding of Al and Pd metallic nanoparticles on graphene. The lateral sizes Lx, Ly, Lz of metal nanoparticles along the x,y,z-axes have been calculated as the difference between the

Review on nanoparticles and nanostructured materials: history, sources, toxicity and regulations

• Jaison Jeevanandam,
• Ahmed Barhoum,
• Yen S. Chan,
• Alain Dufresne and
• Michael K. Danquah

Beilstein J. Nanotechnol. 2018, 9, 1050–1074, doi:10.3762/bjnano.9.98

• started using glazed ceramics for metallic luster decorations [22]. These decorations showed amazing optical properties due to the existence of distinct Ag and/or Cu NPs isolated within the outermost glaze layers. These decorations are an example of metal nanoparticles that display iridescent bright green

Comparative study of antibacterial properties of polystyrene films with TiO_x and Cu nanoparticles fabricated using cluster beam technique

• Vladimir N. Popok,
• Cesarino M. Jeppesen,
• Peter Fojan,
• Anna Kuzminova,
• Jan Hanuš and
• Ondřej Kylián

Beilstein J. Nanotechnol. 2018, 9, 861–869, doi:10.3762/bjnano.9.80

• 10.3762/bjnano.9.80 Abstract Background: Antibacterial materials are of high importance for medicine, and for the production and conservation of food. Among these materials, polymer films with metal nanoparticles (NPs) are of considerable interest for many practical applications. Results: The paper

Noble metal-modified titania with visible-light activity for the decomposition of microorganisms

• Maya Endo,
• Zhishun Wei,
• Kunlei Wang,
• Baris Karabiyik,
• Kenta Yoshiiri,
• Paulina Rokicka,
• Bunsho Ohtani,
• Agata Markowska-Szczupak and
• Ewa Kowalska

Beilstein J. Nanotechnol. 2018, 9, 829–841, doi:10.3762/bjnano.9.77

• ; antimicrobial properties; bactericidal effect; noble-metal nanoparticles; plasmonic photocatalysis; Introduction Environmental pollution and the lack of clean potable water are main issues facing human development. Although, various methods of efficient control and monitoring of waste management have been

A review of carbon-based and non-carbon-based catalyst supports for the selective catalytic reduction of nitric oxide

• Shahreen Binti Izwan Anthonysamy,
• Syahidah Binti Afandi,
• Mehrnoush Khavarian and
• Abdul Rahman Bin Mohamed

Beilstein J. Nanotechnol. 2018, 9, 740–761, doi:10.3762/bjnano.9.68

• groups for the attachment of metal nanoparticles. It is believed that the oxidative treatment may create defects to the hexagonal or pentagonal structures of the GR sheet in the nanotubes. The functional groups can be introduced at the bent parts, defect sites, and at the sidewall of the MWCNTs. Acid