One-pot room-temperature aqueous synthesis of Ag₂Te–Ag nanocomposites

Abstract

Ag2Te–Ag nanocomposites are synthesized at room temperature using a simple aqueous reaction in one pot.

Low Temperature Activation of Tellurium and Resource‐Efficient Synthesis of AuTe2 and Ag2Te in Ionic Liquids

“…Thin films are accessible by vacuum deposition of tellurium on chlorine activated silver films [11] . For the synthesis of Ag 2 Te nanomaterials, which are especially interesting for thermoelectric applications, solvothermal methods are used [6,12–17] . Silver telluride nanowires have been synthesized by the composite‐hydroxide‐mediated (CHM) method at 180 to 225 °C, starting from AgNO 3 and elemental tellurium in NaOH/KOH with hydrazine hydrate and ethylenediamine (en) in a Teflon vessel [6] .…”

“…Ag 2 Te−Ag nanocomposites are accessible at room temperature by reacting AgCl and tellurium in an aqueous NaOH solution with NaBH 4 as reducing agent. The addition of NaCl enhances the solubility of AgCl, which leads to smaller silver grains [12] . Na 2 TeO 3 is often used as a tellurium source because of its good solubility.…”

“…The addition of NaCl enhances the solubility of AgCl, which leads to smaller silver grains. [12] Na 2 TeO 3 is often used as a tellurium source because of its good solubility. In a solvothermal co-reduction approach using a Teflon-lined stainless steel autoclave at 240 °C, more than 20 μm long nanowires formed from an aqueous solution of AgNO 3 with the disodium salt of ethylenediaminetetraacetic acid (Na 2 (EDTA) • 2H 2 O), ethylene glycol (EG), and NaOH.…”

A facile energy-saving route of fabricating thermoelectric Sb 2 Te 3 -Te nanocomposites and nanosized Te

“…As shown in equation (3.1), tellurium dissolves in alkaline solution and undergoes a disproportionation reaction to give Te 2− and TeO 3 2− . Upon addition of NaBH 4 , TeO 3 2− is reduced by to polytellurides with evolution of H 2 gas [ 34 – 36 ]. The presence of polytellurides is evidenced by its deep purple colour.…”

“…Since using solid-state reactions or melting processes would require high-energy input and consume tremendous amount of energy, we aim to synthesize thermoelectric materials using fabrication routes with less energy consumption either in the synthesis and/or consolidation stage [ 34 , 35 ]. In this paper, we demonstrate a green energy-saving route for fabricating Sb 2 Te 3 -Te nanocomposites, which only requires hot pressing the constituent nanopowders at 400°C under an applied pressure of 70 MPa for 1 h.…”