Solvothermal synthesis and thermoelectric properties of indium telluride nanostring-cluster hierarchical structures

Abstract

A simple solvothermal approach has been developed to successfully synthesize n-type α-In2Te3 thermoelectric nanomaterials. The nanostring-cluster hierarchical structures were prepared using In(NO3)3 and Na2TeO3 as the reactants in a mixed solvent of ethylenediamine and ethylene glycol at 200°C for 24 h. A diffusion-limited reaction mechanism was proposed to explain the formation of the hierarchical structures. The Seebeck coefficient of the bulk pellet pressed by the obtained samples exhibits 43% enhancement over that of the corresponding thin film at room temperature. The electrical conductivity of the bulk pellet is one to four orders of magnitude higher than that of the corresponding thin film or p-type bulk sample. The synthetic route can be applied to obtain other low-dimensional semiconducting telluride nanostructures.PACS: 65.80.-g, 68.35.bg, 68.35.bt

Stable, Fast UV–Vis–NIR Photodetector with Excellent Responsivity, Detectivity, and Sensitivity Based on α-In2Te3 Films with a Direct Bandgap

“…Moreover, the previously reported synthesis processes for α-In 2 Te 3 are time-consuming (normally tens of hours), ,,, which further hinder it from widespread applications. Meanwhile, the complicated chemical synthesis processes inevitably introduce various impurities such as precursors, surfactant and byproducts. ,, As a result, the figures-of-merit of these α-In 2 Te 3 photodetectors are quite poor ( R ≈ 0.05 to 1 A/W, D ≈ 5 × 10 9 to 1 × 10 11 cm Hz 1/2 W –1 ), which far lags the state-of-the-art commercial Si and Ge photodetectors ( R ≈ 0.5 to 0.85 A/W, D ≈ 3 × 10 11 to 3 × 10 12 cm Hz 1/2 W –1 ) …”

Novel optoelectronic properties in barbed wire nanophotonic structures of indium telluride

“…Indium telluride nanoparticles have been synthesized using a solvo-thermal method [11] with process parameter modification. Here, In(NO 3 ) 3 (0.3071 g), and Na 2 TeO 3 (0.2712 g) were slowly added to ethylene glycol (EG) (35.5 ml) in an autoclave and stirred for 1 h at room temperature with subsequent addition of 4.4 ml of ethylenediamine (EDA).…”

Crystalline indium sesquitelluride nanostructures: synthesis, growth mechanism and properties

“…The other conditions such as time and temperature are kept the same. As we mentioned in the Introduction, although there is a report on the solvothermal growth of the In 2 Te 3 nanostructure, 24 no systematic studies about the effect of solvent and surfactants on the morphology and growth have been carried out. The following study shows that the morphology of the solvothermal In 2 Te 3 nanostructure can be systematically controlled through time, surfactants and solvent.…”

“…Considerable progress has been made in In 2 Te 3 nanostructures through various approaches. 12,24 However, the synthesis of highquality 1D In 2 Te 3 nanostructures is still a challenge. The major issue of In 2 Te 3 nanowire synthesis is likely due to the lack of suitable precursors for controlling the thermodynamics and kinetics of the nanocrystal nucleation stage, which is essential for controlling the size and shape of the resulting nanostructure.…”

“…To the best of our knowledge, there are no reports on the highly crystalline 1D nanostructures of In 2 Te 3 by the CVD method. On the other hand, although there exists a report on the solvothermal growth of the In 2 Te 3 nanostructure, 24 no systematic studies exist on the effect of solvent and surfactants upon the morphology and growth. The nanostructures prepared by our methods will provide a new pathway towards nanowire based sensors, photovoltaics and optoelectronic devices.…”