We report the synthesis of platinum telluride nanoparticles (Pt 3Te4 NPs) in the solution phase at room temperature using a template-assisted method. The dendrimeric aggregates formed are composed of several small units of Pt3Te4 NPs of ̃4 nm diameter. Tellurium nanowires (Te NWs) are used as the template and the reducing agent in the growth of NPs which occurs due to the galvanic replacement reaction between Te NWs and PtCl62-. Surface-enhanced Raman scattering (SERS) of the dispersed Pt3Te4 NPs was studied using crystal violet (CV) as the analyte. SERS sensitivity up to 10-8 M of CV was observed. The Raman enhancement factor (EF) of adsorbed CV on NP aggregates was calculated to be 1.74×105. The catalytic ability of the as-synthesized Pt3Te4 NPs for the reduction of 4-nitrophenol (4-NP) was studied. © 2010 American Chemical Society.

Pradeep Thalappil

Department Of Chemistry

4-NITROPHENOL (4-NP)

Analytes

Catalytic ability

Crystal violet

Galvanic replacement reactions

RAMAN ENHANCEMENT

Room temperature

Solution phase

Surface-enhanced Raman scattering

TELLURIUM NANOWIRES

Dendrimers

Nanoparticles

Nanowires

Platinum

Raman scattering

Substitution reactions

Synthesis (chemical)

Tellurium

Tellurium compounds

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Langmuir

Hybrid A-B-A type nanowires (NWs) with Ag 5Te 3-HgTe- Ag 5Te 3 composition have been created by the reaction of Hg 2+ with Ag 2Te NWs. The NW morphology of Ag 2Te is preserved upon reaction with minor changes and the two separate phases formed are spatially separated within the same NW. The reaction of Hg 2+ with Ag 2Te NWs was monitored at different concentrations and the reactivity was attributed to cationic exchange depending on solubility products. Hybrid NWs were formed by partial cation exchange only at low concentrations (below 50 ppm) resulting in Ag 5Te 3 and HgTe within the same NW. However, at high concentrations (above 100 ppm), the HgTe phase alone was formed. These studies have been extended to other metal ions such as Pb 2+, Cd 2+, and Zn 2+ whose reactivity towards Ag 2Te NWs is different from that of Hg 2+. These ions form a passivating Te oxide layer upon reaction with other metal ions. The mechanism of reactivity of Hg 2+ is explained on the basis of free energy of formation of the ionic solid. Phase transition of Hg 2+-reacted NWs occurs at a lower temperature than the parent (Ag 2Te NWs) and other metal ions-reacted Ag 2Te NWs. Details of the process were elucidated using microscopic and spectroscopic investigations. The physical and chemical properties of the individual components within a NW are expected to provide a novel functionality to the metal chalcogenide systems. © 2011 The Royal Society of Chemistry.

Nanoscale

Hybrid A-B-A type nanowires through cation exchange

Metals and Materials International

Evaluation of electrodeposited ternary Ni-alloys for thermal stability

Advanced Materials

Binary-Phased Nanoparticles for Enhanced Thermoelectric Properties

Inorganic Chemistry

An Efficient Templating Approach for Synthesis of Highly Uniform CdTe and PbTe Nanowires

Contents: (Adv. Mater. 20/2008)

Crystal Growth & Design

Hydrothermal Synthesis and Thermoelectric Transport Properties of Uniform Single-Crystalline Pearl-Necklace-Shaped PbTe Nanowires

Pt3Te4 nanoparticles from tellurium nanowires

Journal	Langmuir
ISSN	07437463
Open Access	No