Room-Temperature Chemical Synthesis of Silver Telluride Nanowires

Abstract

We have developed a room-temperature solution-phase route for the preparation of one-dimensional silver telluride nanowires (Ag 2 Te NWs). The Ag 2 Te NWs of 600 nm length and 20 nm diameter were synthesized by the reaction of tellurium nanowires (Te NWs) with silver nitrate (AgNO 3 ) in water. We propose that Te NWs act as the template and the reducing agent simultaneously, enabling the formation of polycrystalline Ag 2 Te NWs. Various microscopic and spectroscopic tools, such as HRTEM, SEM, EDAX, XRD, DSC, XPS, and Raman, were used for the characterization of Ag 2 Te NWs. The phase transition corresponding to the structural transition from the low-temperature monoclinic phase to the high-temperature face-centered cubic phase occurs at 417.7 K. We studied the electrical resistance and investigated the influence of temperature on the thermal emf. The Seebeck coefficient showed a maximum of ∼142 µV K -1 , a value much higher than that of the bulk material and thin films (65-130 µV K -1 ). A surface-enhanced Raman scattering investigation of dispersed Ag 2 Te NWs showed them to be sensitive up to 10 -7 M crystal violet. The monodispersity and the homogeneity of the NWs through a simple solution-phase protocol would pave the way for further studies and applications.

TOP as ligand and solvent to synthesize silver telluride nanosheets

“…[4][5][6][7][8][9] Moreover, the recent discovery of the surface-enhanced Raman scattering of Ag 2 Te nanowires has generated intense interest from both fundamental research and application point of views. [10] Thus, a variety of synthetic strategies have been developed to explore novel architectures and morphological patterns of this important functional material. For instance, Ag 2 Te nanocrystals were synthesized from a mixture of AgNO 3 and Te in ethylene glycol or ethylenediamine by ultrasonication at room temperature.…”

“…[15,16] Alternatively, a room-temperature solution-phase route was developed for the preparation of Ag 2 Te nanowires. [10] Ag 2 Te nanomaterials with a large surface-to-volume ratio are attracting ever-increasing attention. In particular, nanosheets are considered ideal candidates for probing size-and dimensionality-dependent physical or chemical phenomena as well as for applications in nanodevices due to their large aspect ratio and faceting nature.…”

Morphological evolution, growth mechanism, and magneto-transport properties of silver telluride one-dimensional nanostructures

“…Recently, Ag 2 Te NWs were synthesized by a composite hydroxide-mediated method, where AgNO 3 and Te powder were heated at 498 K in a Teflon vessel containing ethylenediamine and hydrazine hydrate [23]. Samal and Pradeep [24] have developed a room-temperature solution-phase route for the preparation of 1D Ag 2 Te NWs. In addition, our research group has more recently reported the synthesis and electrical properties of individual Ag 2 Te NWs via a hydrothermal process [25].…”

Heterojunction double dumb-bell Ag2Te–Te–Ag2Te nanowires

“…These 1D Te nanostructures have further been utilised as a template for synthesizing different metal telluride nanostructures. [27][28][29][30][31][32][33] While several of these single phase NWs have been synthesized, recent efforts have been directed towards the facile synthesis of heterostuctured NWs though reports have been very few. 34 These 1D heteronanostructures belong to multiple types.…”