Zinc oxide nanostructures for fluorescence and Raman signal enhancement: a review

• Ioana Marica,
• Fran Nekvapil,
• Maria Ștefan,
• Cosmin Farcău and
• Alexandra Falamaș

Beilstein J. Nanotechnol. 2022, 13, 472–490, doi:10.3762/bjnano.13.40

• controlled method. ZnO nanorods were first grown and the rod surface was then decorated with Au NPs, resulting in ZnO nanorods with an average diameter of 300 nm and spherical Au NPs with sizes between 5 and 10 nm [46]. ZnO nanorod arrays were obtained by hydrothermal synthesis and then Ag NPs were deposited

• broad range of wavelengths. This multiplexing property was investigated for ZnO nanoflower (NF) and nanorod arrays by [114]. Different Alexa Fluor (AF) dyes were used and the results showed a significant enhancement of their fluorescence over the entire visual spectral range (400–840 nm). Specifically

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

• ], anisotropically etched single-crystal silicon [47], plasma-treated plastic [48] and anodic aluminum oxide films [49][50][51][52]. Some methods aim at the fabrication of three -dimensional silver or gold structures, such as oblique-angle vapor deposition used for the fabrication of silver nanorod arrays [53][54

Polarization-dependent strong coupling between silver nanorods and photochromic molecules

• Gwénaëlle Lamri,
• Alessandro Veltri,
• Jean Aubard,
• Pierre-Michel Adam,
• Nordin Felidj and
• Anne-Laure Baudrion

Beilstein J. Nanotechnol. 2018, 9, 2657–2664, doi:10.3762/bjnano.9.247

• measured nearby the nanorod arrays in order to eliminate the contribution of the molecular absorption band of the MC isomer. Results and Discussion Figure 2 shows the extinction spectra for nanorod widths of 70 nm (a–c) and 90 nm (d–f). In each graph, the blue curves are related to the short axis plasmonic

• ellipsometry. Extinction spectra of the silver nanorod arrays covered with photochromic molecules before (in SPY) and after (in MC) the photochromic transition. The 0° and 90° polarization orientations, corresponding to the excitation of the long and the short axis, are in black/grey and in dark/light blue

• . A halogen lamp is used to illuminate the sample from the glass side and the transmitted light is recorded through a 20× bright-field objective. The signal is then sent to a spectrometer to record extinction spectra. The Figure 1b shows typical extinction spectra recorded on five different nanorod

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

• components fall out as sediments. Furthermore, maintaining the temperature below the boiling point prevents any intense evaporation of the working solution, thereby allowing the experiment to be carried out without the use of an autoclave. In order to grow uniform and vertically aligned ZnO nanorod arrays

• times and dried. More detailed information can be found in [15][16]. The ZnO nanoneedles were synthesized by increasing the solution’s pH level to form nanorod arrays with reduced diameters and higher aspect ratios. In order to maintain the chemical purity of the samples, the same chemical components

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

• Rashmi Acharya,
• Brundabana Naik and
• Kulamani Parida

Beilstein J. Nanotechnol. 2018, 9, 1448–1470, doi:10.3762/bjnano.9.137

• reduced to a trivalent state [186]. Gao et al. fabricated MFe2O4 (M = Ni2+, Zn2+, Co2+ and Sr2+) modified TiO2 nanorod arrays (NRAs) to compare their photoelectrochemical and photocatalytic activity with that of bare TiO2 NRAs towards reduction of Cr(VI) [97]. All the modified TiO2 NRAs exhibited strong

Facile synthesis of a ZnO–BiOI p–n nano-heterojunction with excellent visible-light photocatalytic activity

• Mengyuan Zhang,
• Jiaqian Qin,
• Pengfei Yu,
• Bing Zhang,
• Mingzhen Ma,
• Xinyu Zhang and
• Riping Liu

Beilstein J. Nanotechnol. 2018, 9, 789–800, doi:10.3762/bjnano.9.72

• . described the synthesis of p–n heterostructures where p-type BiOI nanoplates decorated on n-type ZnO nanorod arrays which were synthesized through a solvothermal route. The high-contact areas provided by the fast charge transfer channel of BiOI and ZnO create the efficient photocatalyst [35]. Tong et al

Gas-sensing behaviour of ZnO/diamond nanostructures

• Marina Davydova,
• Alexandr Laposa,
• Jiri Smarhak,
• Alexander Kromka,
• Neda Neykova,
• Josef Nahlik,
• Jiri Kroutil,
• Jan Drahokoupil and
• Jan Voves

Beilstein J. Nanotechnol. 2018, 9, 22–29, doi:10.3762/bjnano.9.4

• were exposed to pure hydrogen plasma for 10 min in order to create the p-type surface conductivity (Figure 1a) [29]. Vertically aligned 1-D ZnO nanorod arrays were synthesized either on a bare IDE glass substrate (Figure 1b) or on an IDE glass substrate covered with a diamond thin film (Figure 1c) by

Morphological and structural characterization of single-crystal ZnO nanorod arrays on flexible and non-flexible substrates

• Omar F. Farhat,
• Mohd M. Halim,
• Mat J. Abdullah,
• Mohammed K. M. Ali and
• Nageh K. Allam

Beilstein J. Nanotechnol. 2015, 6, 720–725, doi:10.3762/bjnano.6.73

• , The American University in Cairo, New Cairo 11835, Egypt 10.3762/bjnano.6.73 Abstract We report a facile synthesis of zinc oxide (ZnO) nanorod arrays using an optimized, chemical bath deposition method on glass, PET and Si substrates. The morphological and structural properties of the ZnO nanorod

• scale fabrication of ZnO nanoarchitectures on any substrate [12][13][14]. Herein, we report an optimized CBD method, employed to fabricate single-crystal ZnO nanorod arrays on flexible and non-flexible substrates at low temperature. High quality, oriented ZnO nanorods of uniform thickness and length

• distribution ensure a desired light absorption and propagation characteristics as well as percolation pathways for charge transfer. Experimental ZnO nanorod arrays were grown on three different substrates (glass, PET and Si) by the chemical bath deposition (CBD) technique. The substrates (2 × 2 cm) were

Electromagnetic enhancement of ordered silver nanorod arrays evaluated by discrete dipole approximation

• Guoke Wei,
• Jinliang Wang and
• Yu Chen

Beilstein J. Nanotechnol. 2015, 6, 686–696, doi:10.3762/bjnano.6.69

• applications of SERS. Recently, it has been demonstrated that highly ordered Ag and Cu nanorod arrays can be fabricated by a guided OAD method, which may circumvent the problems of gap-size and diameter control, leading to the reproducible fabrication of highly SERS-active substrates [16]. The SERS enhancement

• were investigated except in the sections of structure dependence and excitation-wavelength dependence. Results and Discussion Extinction for isolated nanorods and nanorod arrays Typically, metal nanoparticle with anisotropic structure shows multiple plasmon resonances associated with different modes

• that the EFs of S42 and S−42:42 are comparable at the same AR region between 3.0 and 5.0. And both of their EFavg decrease as the AR increases, consistent with the simulation result from Cu nanorod arrays in our previous work [16]. As the increase of surface area can result in an increased amount of

Hybrid spin-crossover nanostructures

• Carlos M. Quintero,
• Gautier Félix,
• Iurii Suleimanov,
• José Sánchez Costa,
• Gábor Molnár,
• Lionel Salmon,
• William Nicolazzi and
• Azzedine Bousseksou

Beilstein J. Nanotechnol. 2014, 5, 2230–2239, doi:10.3762/bjnano.5.232

• diagram for an analog device but employing NR as the emitting material [30]. Adapted with permission from [28] and [30], copyright 2008 and 2013 Elsevier. a) SEM image of a gold nanorod array with 200 nm pitch. b) Extinction spectra of three nanorod arrays with different aspect ratios. c) Plasmon

Controlling the dispersion of supported polyoxometalate heterogeneous catalysts: impact of hybridization and the role of hydrophilicity–hydrophobicity balance and supramolecularity

• Gijo Raj,
• Colas Swalus,
• Eglantine Arendt,
• Pierre Eloy,
• Michel Devillers and
• Eric M. Gaigneaux

Beilstein J. Nanotechnol. 2014, 5, 1749–1759, doi:10.3762/bjnano.5.185

• arrangement of carbon atoms in the graphite basal plane, and hence reveal that the orientation of nanorods in the hybrid material is indeed controlled by the epitaxial interaction of DODA chains with HOPG. The periodicity of the nanorod arrays, measured as peak-to-peak distances from AFM cross-section

Nanostructure sensitization of transition metal oxides for visible-light photocatalysis

• Hongjun Chen and
• Lianzhou Wang

Beilstein J. Nanotechnol. 2014, 5, 696–710, doi:10.3762/bjnano.5.82

• carbon nanodot–TiO2 nanotube [130], carbon nanodot–SrTiO3 film [131], carbon nanodot–TiO2 nanoparticle [114], and carbon nanodot–ZnO nanorod arrays [132], exhibited a good performance for photoelectrochemical water splitting or photocatalytic activity in dye degradation under visible light irradiation

Encapsulation of nanoparticles into single-crystal ZnO nanorods and microrods

• Jinzhang Liu,
• Marco Notarianni,
• Llew Rintoul and
• Nunzio Motta

Beilstein J. Nanotechnol. 2014, 5, 485–493, doi:10.3762/bjnano.5.56

• study the morphologies of ZnO nanorods and embedded nanoparticles. For micro-PL measurement, ZnO nanorod arrays were crushed against a bare Si, to produce fractured nanorods lying on the surface. A micro-Raman/PL spectrometer (Renishaw inVia) with 532 nm laser was employed to study the PL of single ZnO

Template based precursor route for the synthesis of CuInSe₂ nanorod arrays for potential solar cell applications

• Mikhail Pashchanka,
• Jonas Bang,
• Niklas S. A. Gora,
• Ildiko Balog,
• Rudolf C. Hoffmann and
• Jörg J. Schneider

Beilstein J. Nanotechnol. 2013, 4, 868–874, doi:10.3762/bjnano.4.98

• CuInSe2 (CISe) nanorods are promising for the fabrication of highly efficient active layers in solar cells. In this work we report on a nanocasting approach, which uses track-etched polycarbonate films as hard templates for obtaining three-dimensionally (3D) arranged CISe nanorod arrays. Copper and indium

• purity and crystallinity, and a stoichiometric composition of the CISe ternary semiconductor compound. Keywords: CIS; light absorption; nanocasting; nanorod arrays; precursor synthesis; Introduction Polycrystalline heterojunction solar cells with a columnar morphology of the photovoltaic active layer

• synthesis of stoichiometric ternary CuInS2 nanorod arrays [9]. In the present work, we extend our method to the photochemically even more active CuInSe2 material and demonstrate the synthesis of uniform polycrystalline CuInSe2 nanorod arrays. Selenourea was used as a Se source analogous to thiourea in our

Low-temperature solution growth of ZnO nanotube arrays

• Ki-Woong Chae,
• Qifeng Zhang,
• Jeong Seog Kim,
• Yoon-Ha Jeong and
• Guozhong Cao

Beilstein J. Nanotechnol. 2010, 1, 128–134, doi:10.3762/bjnano.1.15

• ]. Figure 2 shows the SEM image of ZnO nanorod arrays obtained by a growth on the ZnO-seeded ITO substrate at 90 °C for 10 h. The synthesized ZnO nanorods with a diameter of ~200 nm were well aligned and have a perfect hexagonal shape. The length of the ZnO nanorods observed by SEM was approximately 1.2 µm

• ZnO-seeded ITO substrate annealed at 500 °C for 30 min. Top view of ZnO nanorod arrays grown on a ZnO-seeded ITO substrate at 90 °C for 10 h. Evolution of the morphology of ZnO nanocrystals ranging from rods to tubes while the solution was kept at 90 °C for 3 h and then cooled down to (a) 80 °C (20 h

• temperature decreases. SEM top morphology of ZnO nanorod arrays grown on a ZnO-seeded ITO substrate at 60 °C for 24 h. SEM images of (a) ZnO nanorods grown at 90 °C for 3 h and then 60 °C for 5 h, and (b) nanotubes grown at 60 °C for 5 h in a solution which was, however, pretreated at 60 °C for 1 h and then