Synthesis of Inorganic Nanotubes

Rao, C. N. R.; Govindaraj, A.

doi:10.1002/9783527628940.ch6

Cited by 11 publications

(14 citation statements)

References 236 publications

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“…Further interest in unique and tunable size-dependent properties has motivated the development of quasi-one-dimensional (nanotube and nanowire) chalcogenides. The majority of these efforts, however, focus on physical and chemical synthesis techniques requiring templates, precursors, and hydro-or solvothermal methods, typically under relatively extreme conditions [14].…”

Section: Introductionmentioning

confidence: 99%

Field effect transistors based on semiconductive microbially synthesized chalcogenide nanofibers

2015

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Microbial redox activity offers a potentially transformative approach to the low-temperature synthesis of nanostructured inorganic materials. Diverse strains of the dissimilatory metal-reducing bacteria Shewanella are known to produce photoactive filamentous arsenic sulfide nanomaterials by reducing arsenate and thiosulfate in anaerobic culture conditions. Here we report in situ microscopic observations and measure the thermally activated (79 kJ mol(-1)) precipitation kinetics of high yield (504 mg per liter of culture, 82% of theoretical maximum) extracellular As2S3 nanofibers produced by Shewanella sp. strain ANA-3, and demonstrate their potential in functional devices by constructing field effect transistors (FETs) based on individual nanofibers. The use of strain ANA-3, which possesses both respiratory and detoxification arsenic reductases, resulted in significantly faster nanofiber synthesis than other strains previously tested, mutants of ANA-3 deficient in arsenic reduction, and when compared to abiotic arsenic sulfide precipitation from As(III) and S(2-). Detailed characterization by electron microscopy, energy-dispersive X-ray spectroscopy, electron probe microanalysis and Tauc analysis of UV-vis spectrophotometry showed the biogenic precipitate to consist primarily of amorphous As2S3 nanofibers with an indirect optical band gap of 2.37 eV. X-ray diffraction also revealed the presence of crystalline As8S(9-x) minerals that, until recently, were thought to form only at higher temperatures and under hydrothermal conditions. The nanoscale FETs enabled a detailed characterization of the charge mobility (∼10(-5) cm(2) V(-1) s(-1)) and gating behavior of the heterogeneously doped nanofibers. These studies indicate that the biotransformation of metalloids and chalcogens by bacteria enables fast, efficient, sustainable synthesis of technologically relevant chalcogenides for potential electronic and optoelectronic applications.

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Section: Introductionmentioning

confidence: 99%

Field effect transistors based on semiconductive microbially synthesized chalcogenide nanofibers

2015

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“…Several strategies, such as sulfurization by heating, decomposition of precursor crystals, or solvothermal synthesis, have been employed for the synthesis of inorganic nanotubes [3][4][5][6][7][8][9] . Among those, template synthesis is one of the rationalized methods for the production of inorganic nanotubes [10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Electrochemical method for rapid synthesis of Zinc Pentacyanonitrosylferrate Nanotubes

Bargeshadi¹,

Sabzi²

2014

10.5267/j.ccl

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In this paper, a rapid and simple approach was developed for the preparation of zinc pentacyanonitrosylferrate nanotubes (ZnPCNF NTs) within the cylindrical pores of anodic aluminum oxide (AAO) template by electrochemical method. The AAO was fabricated in two steps anodizing from aluminum foil. The first anodization of aluminum foil was performed in 0.2 mol L -1 H 2 C 2 O 4 followed by removal of the formed porous oxide film by a solution of 6 wt% of phosphoric acid. The second anodization step was then performed using the same conditions as the previous step. Scanning electron microscope (SEM) and X-ray diffraction (XRD) method were employed to characterize the resulting highly oriented uniform hollow tube array which its diameter was in the range of 25-75 nm depending on the applied voltage and the length of nanotubes was equal to the thickness of AAO which was about 2 m. The growth properties of the ZnPCNF NTs array film can be achieved by controlling the structure of the template and applied potential across the cell.

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“…1 Web: http://www.fen.bilkent.edu.tr/∼ozensoy. shape and porosity of TiO 2 particles [6][7][8]. In particular, utilization of organic templates such as polymers offers vast opportunities for controlling the shapes of inorganic materials at the micrometer/nanometer scale.…”

Section: Introductionmentioning

confidence: 99%

Thermal evolution of structure and photocatalytic activity in polymer microsphere templated TiO2 microbowls

Erdogan

Polat

Garifullin

et al. 2014

Applied Surface Science

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a b s t r a c tPolystyrene cross-linked divinyl benzene (PS-co-DVB) microspheres were used as an organic template in order to synthesize photocatalytic TiO 2 microspheres and microbowls. Photocatalytic activity of the microbowl surfaces were demonstrated both in the gas phase via photocatalytic NO(g) oxidation by O 2 (g) as well as in the liquid phase via Rhodamine B degradation. Thermal degradation mechanism of the polymer template and its direct influence on the TiO 2 crystal structure, surface morphology, composition, specific surface area and the gas/liquid phase photocatalytic activity data were discussed in detail. With increasing calcination temperatures, spherical polymer template first undergoes a glass transition, covering the TiO 2 film, followed by the complete decomposition of the organic template to yield TiO 2 exposed microbowl structures. TiO 2 microbowl systems calcined at 600 • C yielded the highest per-site basis photocatalytic activity. Crystallographic and electronic properties of the TiO 2 microsphere surfaces as well as their surface area play a crucial role in their ultimate photocatalytic activity. It was demonstrated that the polymer microsphere templated TiO 2 photocatalysts presented in the current work offer a promising and a versatile synthetic platform for photocatalytic DeNO x applications for air purification technologies.

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Synthesis of Inorganic Nanotubes

Cited by 11 publications

References 236 publications

Field effect transistors based on semiconductive microbially synthesized chalcogenide nanofibers

Field effect transistors based on semiconductive microbially synthesized chalcogenide nanofibers

Electrochemical method for rapid synthesis of Zinc Pentacyanonitrosylferrate Nanotubes

Thermal evolution of structure and photocatalytic activity in polymer microsphere templated TiO2 microbowls

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