Preparation and synthesis of Ag2Se nanowires produced by template directed synthesis

Glanville, Yvonne; Narehood, D. G.; Sokol, P. E.; Amma, Achim

doi:10.1039/b202913h

Cited by 35 publications

(18 citation statements)

References 7 publications

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“…In future work, we plan to investigate the off-stoichiometric compositions that exhibit high MR and determine the effect of 3-D nanoscale confinement on the p-type or n-type materials. This will provide an interesting comparison with the results reported for silver chalcogenides thin films 7,28 and wires, 9,29 …”

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confidence: 92%

Effect of nanoscale confinement on the β−α phase transition in Ag2Se

León

Ren

Saboungi

2008

Journal of Applied Physics

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The confinement of silver selenide was investigated using mesoporous silica. Results from x-ray diffraction and electron microscopy show that the confined material still exhibits a β to α transition similar to the one that takes place in the bulk crystalline state but with a transition temperature that depends significantly on the confinement conditions. Decreasing the pore size leads to an increase of the transition temperature, opposite to the behavior of the melting point observed in several metallic and organic materials. In the free particles, on the other hand, no size dependence is observed with particle sizes down to 4 nm.A recent review by Alcoutlabi and McKenna 1 has summarized the state of the art of nanoscale confinement effects on the first-order thermodynamics in confined geometries and shown that the Gibbs-Thomson equation is suitable for describing the changes in melting phenomena observed in the literature due to nanometer scale confinement. They also discussed the more challenging issue of the glass transition for confined systems under different geometrical conditions. However, to our knowledge the problem of the changes in solid-solid phase transitions due to confinement has not been addressed. Some silver ionic salts as well as silver chalcogenides undergo a relatively low-temperature solid-solid transition with dramatic differences between the two phases, e.g., transition from an ordered to a disordered phase with changes in the nature of the conduction mechanism in each phase. 2,3 The structure and spectroscopic properties of various Se based compounds confined in cages of zeolites have been studied, 4 but no attempts have been made to investigate changes induced by the confinement on firstorder transitions. Silver selenide, Ag 2 Se, is such an example and here we focus uniquely on this compound. At room temperature, Ag 2 Se is a narrow band-gap semiconductor with high carrier mobility and without magnetoresistance (MR) and undergoes a phase transition in the solid state. 5,6 The lowtemperature phase, designated as β−Ag 2 Se with an orthorhombic structure, has been widely used as a photosensitizer in photographic films and thermochromic materials. The transition to the hightemperature phase α−Ag 2 Se takes place accompanied by a decrease in volume and has been reported with values of the transition temperature T βα ranging from 127 °C to 143 °C. 7,8 The high-temperature phase is a superionic conductor with mobile Ag + ions used as the solid electrolyte in photochargeable secondary batteries. 9 In the liquid state, it has been shown that the temperature dependence of the conductivity is negative, which is unusual for liquids with a conductivity in the range typical for liquid semiconductors in the narrow definition of Mott. 10,11 Moreover, β−Ag 2 Se has been recently shown to exhibit a significant magnetoresistance (MR) by manipulating small departures from stoichiometry. 12 This large magnetic response, a near-linear increase of the resistance with the applied magnetic field witho...

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confidence: 92%

Effect of nanoscale confinement on the β−α phase transition in Ag2Se

León

Ren

Saboungi

2008

Journal of Applied Physics

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“…Electrodeposition of silver selenide thin films has been reported recently from aq. solution [15]. Template-based synthesis has also been described for silver selenide in addition to its synthesis by sonochemical method by using polyol and ethylenediamine [1,16].…”

Section: Introductionmentioning

confidence: 99%

Novel synthesis of silver selenide nano-powder from silver nitrate and organo-selenium compound

Khanna

Das

2004

Materials Letters

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“…A number of investigations have been carried out to address the synthesis of I–IV compound nanostructured materials (Glanville et al ., 2002). A novel electrochemical route to fabricate highly ordered stoichiometric Ag 2 Se and ternary Ag 2 Se 1− x Te x nanowire arrays from nonaqueous dimethyl sulphoxide solutions have been reported (Ruizhi et al ., 2003).…”

Section: Introductionmentioning

confidence: 99%

Morphological properties of Ag2SeTe nano thin films prepared by thermal evaporation

Vijayan¹,

Soundararajan²,

Chandramohan³

et al. 2011

Journal of Microscopy

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SummarySemiconducting silver selenide telluride (Ag 2 SeTe) thin films were prepared with different thicknesses onto glass substrates at room temperature using thermal evaporation technique. The structural properties were determined as a function of thickness by X-ray diffraction exhibiting no preferential orientation along any plane; however, the films are found to have peaks corresponding to mixed phase. The morphology of these films was studied using scanning electron microscope and atomic force microscopy respectively, and is reported. The morphological properties are found to be very sensitive to the thin film thickness. The composition of the films is also estimated using energy dispersive analysis using X-rays and are also reported.

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Preparation and synthesis of Ag2Se nanowires produced by template directed synthesis

Cited by 35 publications

References 7 publications

Effect of nanoscale confinement on the β−α phase transition in Ag2Se

Effect of nanoscale confinement on the β−α phase transition in Ag2Se

Novel synthesis of silver selenide nano-powder from silver nitrate and organo-selenium compound

Morphological properties of Ag2SeTe nano thin films prepared by thermal evaporation

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