Mesoporous cerium oxide nanospheres for the visible-light driven photocatalytic degradation of dyes

• Subas K. Muduli,
• Songling Wang,
• Shi Chen,
• Chin Fan Ng,
• Cheng Hon Alfred Huan,
• Tze Chien Sum and
• Han Sen Soo

Beilstein J. Nanotechnol. 2014, 5, 517–523, doi:10.3762/bjnano.5.60

• Polycrystalline Ce7O12 samples have been previously synthesized, but harsh conditions (up to 1030 °C) by reduction of CeO2 with CO were employed [25][26]. Instead, mild, surfactant-free solvothermal conditions were used to prepare mesoporous cerium oxide with oxygen vacancies. A solution of ceric ammonium nitrate

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

• onto Si substrates in an aqueous solution containing zinc nitrate and hexamethylenetetramine (HMTA) with molar ratio of 1:1. A piece of bare Si was put face-down floating on top of the nutrient solution surface. The strategy to encapsulate nanoparticles into ZnO nanorods is through a multi-step growth

• nitrate and HMTA in the solution were used to control the nanorod thickness. To grow thin nanorods, 15 mM Zn2+ in the solution was used. Thick nanorods were grown in the 30 mM solution. After growth, the sample was rinsed with DI water and dried. Afterwards, nanoparticle suspension was dropped onto the

One pot synthesis of silver nanoparticles using a cyclodextrin containing polymer as reductant and stabilizer

• Arkadius Maciollek and
• Helmut Ritter

Beilstein J. Nanotechnol. 2014, 5, 380–385, doi:10.3762/bjnano.5.44

• using silver nitrate and a copolymer 1 from N-isopropylacrylamide (NIPAM) and mono-(1H-triazolylmethyl)-2-methylacryl-β-cyclodextrin acting as reductant and stabilizer without using any additional reducing agent is reported. The reduction was carried out in aqueous solution under pH neutral conditions

• at room temperature. The results of dynamic light scattering analysis and transmission electron microscopy show adjustable particle sizes from 30–100 nm, due to variation of silver nitrate concentration, the polymeric reducing and stabilisation agent concentration or reaction time. The spherical

• -β-cyclodextrin [20] as reduction and steric stabilization agent without any additional reduction agent or energy source. Silver nitrate has been reduced under pH neutral conditions at room temperature. In this green one pot synthesis neither commonly used toxic reduction agent nor additional energy

Study of mesoporous CdS-quantum-dot-sensitized TiO₂ films by using X-ray photoelectron spectroscopy and AFM

• Mohamed N. Ghazzal,
• Robert Wojcieszak,
• Gijo Raj and
• Eric M. Gaigneaux

Beilstein J. Nanotechnol. 2014, 5, 68–76, doi:10.3762/bjnano.5.6

• ]. Briefly, the titania films were dipped for 1 min into a saturated nitrate solution of Cd2+ and washed with water for several times in order to eliminate excess reactive species. The deposition of Cd2+ was performed under controlled pH (≈10), which was adjusted by adding NaOH solution at 1 M. The chemical

Cyclic photochemical re-growth of gold nanoparticles: Overcoming the mask-erosion limit during reactive ion etching on the nanoscale

• Burcin Özdemir,
• Axel Seidenstücker,
• Alfred Plettl and
• Paul Ziemann

Beilstein J. Nanotechnol. 2013, 4, 886–894, doi:10.3762/bjnano.4.100

• iron(III) nitrate into the PEO domains and applying a UV/ozone treatment iron oxide is obtained while the organic components are removed. Thus, after an additional annealing, a hexagonal array of Fe2O3 particles is obtained and can be used as mask for a subsequent etching process. Both of the last two

Characterization and properties of micro- and nanowires of controlled size, composition, and geometry fabricated by electrodeposition and ion-track technology

• Maria Eugenia Toimil-Molares

Beilstein J. Nanotechnol. 2012, 3, 860–883, doi:10.3762/bjnano.3.97

• electrolyte consisted of an aqueous solution of bismuth nitrate pentahydrate, TeO2, and nitric acid. As shown by means of XRD, TEM, SEM, and EDX (energy-dispersive X-ray analysis), the parameters involved in the electrodeposition process, T, U, and diameter, density, and length of the channels in the template

Paper modified with ZnO nanorods – antimicrobial studies

• Mayuree Jaisai,
• Sunandan Baruah and
• Joydeep Dutta

Beilstein J. Nanotechnol. 2012, 3, 684–691, doi:10.3762/bjnano.3.78

• show ZnO nanorods grown on paper by using a 10 mM zinc nitrate and hexamine growth solution for 10 h and 20 h, respectively. The ZnO nanorods grown with a 20 mM concentration of reactants (Figure 6e and Figure 6f) are thicker and longer as compared to the ones grown at 10 mM [27][28]. The dimensions of

• the ZnO nanorods grown under different conditions are given in Table 1. The overall loading of ZnO on the paper matrix is about 200 μg/cm2 for the sample onto which the nanorods were grown in a reaction bath with a concentration of 10 mM of zinc nitrate and hexamethylenetetramine, and about 1.2 mg/cm2

• seeded paper substrates were dipped in an equimolar solution of zinc nitrate hexahydrate [Zn (NO3)2·6H2O, APS Ajax Finechem] and hexamethylenetetramine [(CH2)6N4, Carlo Erba], and the admixture was maintained at 90 °C for up to 20 h, which led to the growth of hexagonal ZnO nanorods. Two different

Conducting composite materials from the biopolymer kappa-carrageenan and carbon nanotubes

• Ali Aldalbahi,
• Jin Chu,
• Peter Feng and
• Marc in het Panhuis

Beilstein J. Nanotechnol. 2012, 3, 415–427, doi:10.3762/bjnano.3.48

• , glycerine) is a polyol compound widely used in a diverse range of industries. For example, in the food industries it is added as a humectant, while it is also used to produce an essential ingredient (glyceryl nitrate) for explosives. Of particular relevance to the research presented in this paper is its

Variations in the structure and reactivity of thioester functionalized self-assembled monolayers and their use for controlled surface modification

• Inbal Aped,
• Yacov Mazuz and
• Chaim N. Sukenik

Beilstein J. Nanotechnol. 2012, 3, 213–220, doi:10.3762/bjnano.3.24

• dimension to the versatility and utility of the SAMs [4][5][6][7]. Our laboratory has reported in situ transformations of siloxane-anchored SAMs in which SAM surface functionality was changed from benzene rings to arylsulfonic acids [8][9], from nitrate esters to hydroxyls [10], and from carboxylate esters

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

• (5 mL) with tip dimensions of 0.8 × 40 mm at an electrode distance of 20 cm and 26 kV for 12 h. After 12 h, a dense web of PMMA fibres was collected on the copper counter electrode (15 × 15 cm2). Preparation of ceria nanotubes 1.37 g (2.5 mmol) cerium ammonium nitrate (NH4)2Ce(NO3)6 (Alfa Aesar, 98.0

• %, Sigma-Aldrich) in ethanol (≥99.8%, 1% methyl ethyl ketone, Carl Roth) was added under vigorous stirring to an ethanolic solution of cerium(III) nitrate hexahydrate (≥99.5%, p.a, Carl Roth, 0.33 mol·L−1) with 20% molar excess. A white gel formed instantaneously and was subsequently aged for an additional

Highly efficient ZnO/Au Schottky barrier dye-sensitized solar cells: Role of gold nanoparticles on the charge-transfer process

• Tanujjal Bora,
• Htet H. Kyaw,
• Soumik Sarkar,
• Samir K. Pal and
• Joydeep Dutta

Beilstein J. Nanotechnol. 2011, 2, 681–690, doi:10.3762/bjnano.2.73

• -nanocomposite DSSC. Experimental Preparation of ZnO/Au-nanocomposite photoelectrode All chemicals used in this study were analytical grade and were used without any further purification. Zinc acetate dihydrate (Zn(CH3COO)2·2H2O, Merck), zinc nitrate hexahydrate (Zn(NO3)2·6H2O, Sigma-Aldrich) and

• ][39]. Briefly, a 1 mM zinc acetate solution in isopropanol was used to prepare the ZnO seed layer on a FTO substrate followed by annealing in air at 350 °C for 5 h. A 20 mM aqueous solution of zinc nitrate and hexamethylenetetramine was used as a precursor solution for ZnO-nanorod growth and the

Ceria/silicon carbide core–shell materials prepared by miniemulsion technique

• Lars Borchardt,
• Martin Oschatz,
• Robert Frind,
• Emanuel Kockrick,
• Martin R. Lohe,
• Christoph P. Hauser,
• Clemens K. Weiss,
• Katharina Landfester,
• Bernd Büchner and
• Stefan Kaskel

Beilstein J. Nanotechnol. 2011, 2, 638–644, doi:10.3762/bjnano.2.67

• /CeO2 has a smaller amount of active material (1.5 wt % Ce) than SiC/CeO2 (4 wt %), it shows a higher activity, which can be explained by the more efficient immobilization of the cerium nitrate on the acrylic acid modified surface of the PCS spheres during functionalization. The specific surface area of

Twofold role of calcined hydrotalcites in the degradation of methyl parathion pesticide

• Alvaro Sampieri,
• Geolar Fetter,
• María Elena Villafuerte-Castrejon,
• Adriana Tejeda-Cruz and
• Pedro Bosch

Beilstein J. Nanotechnol. 2011, 2, 99–103, doi:10.3762/bjnano.2.11

• only with carbonates but also with other anionic entities such as phosphate, nitrate and sulfate. However, the X-ray diffraction patterns of Zn–Al (Figure 3b) show that the hydrotalcite structure is only partly recovered, which is in accord with the MP degradation behavior. As expected, the X-ray

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

• National Center for Nanomaterials Technology, Pohang University of Science and Technology, Pohang, South Korea 10.3762/bjnano.1.15 Abstract Single crystal ZnO nanotube arrays were synthesized at low temperature in an aqueous solution containing zinc nitrate and hexamethylenetetramine. It was found that

• . Experimental ZnO nanorods were grown on an indium doped tin oxide (ITO) glass substrate, on which ZnO nanocrystallites as seeds were pre-prepared via an electrophoretic deposition. Typically, the ITO substrate was immersed in a 0.5 M zinc nitrate (Fisher Scientific Corp., USA), and an electric potential of 2.5

• -seeded ITO substrates were sealed in a vial containing an equimolar solution of 0.1 M zinc nitrate and hexamethylenetetramine (Alfa Aesar, USA). The solution was then heated to 90 °C and kept for 10 h in a programmable furnace (Thermolyne Type 48000, USA). A different process was adopted to form

Aerosol assisted fabrication of two dimensional ZnO island arrays and honeycomb patterns with identical lattice structures

• Mitsuhiro Numata and
• Yoshihiro Koide

Beilstein J. Nanotechnol. 2010, 1, 71–74, doi:10.3762/bjnano.1.9

• ) × 15 (depth) cm3). After drying for 1 h in air, calcination was performed at atmospheric pressure in an oven set at 500 °C for 2 h. Subsequently, ZnO nanocrystals were grown by immersing the substrate in a cylindrical glass vessel that contained a mixed aqueous solution of zinc nitrate hexahydrate (10

Enhanced visible light photocatalysis through fast crystallization of zinc oxide nanorods

• Sunandan Baruah,
• Mohammad Abbas Mahmood,
• Myo Tay Zar Myint,
• Tanujjal Bora and
• Joydeep Dutta

Beilstein J. Nanotechnol. 2010, 1, 14–20, doi:10.3762/bjnano.1.3

• crystallization (with microwave irradiation) is shown in Figure 4. The width and length of the nanorods were measured after 5 h growth with starting solutions of 0.1 mM, 1.0 mM and 10.0 mM zinc nitrate hexahydrate and hexamethylenetetramine at a temperature of 90 °C. An increase in size was observed for the

• growth concentrations of the reactant solution. A typical scanning electron micrograph of ZnO nanorods grown through fast crystallization in a reaction bath containing 10.0 mM zinc nitrate hexahydrate and hexamethylenetetramine with microwave irradiation for 10 h is shown in Figure 5. Visible structural

• by fast hydrolysis (surface area ≈ 33.74 cm2), were selected. Sample 2 was selected as it showed maximum activity compared to Sample 1 and Sample 3. The fast hydrolyzed sample was grown using a reaction bath at a concentration of 10.0 mM of zinc nitrate and hexamine for 4 h under microwave