The Summery of research :

Number of Years of Experience in the Field Related to the Proposed Project : 35 years

Fields of Specialization :

This researcher has wide experience in the area of process development of material synthesis. The major areas where the researcher has experienced are as follows:

1. Chemical techniques of Thin-film Deposition.
2. Synthesis of photo conducting polymer and their characterization.
3. Polymer-organic matrix method for synthesis of Nano-sized inorganic materials.
4. Aqueous sol-gel method for synthesis of inorganic silicates.
5. Synthesis and characterization of Nanocrystalline / Advanced Ceramic Materials.

The field of interest :

• Thinfilm
• Electronic polymer ( Photoconducting and conducting )
• Advanced Ceramics
• High-Tc super conductor
• Nano-ceramics
• Nano- luminescence material
• Nano-catalyst
• Mesoporous material
• Nano-materials for sensor
• Nano-magnetic materials for biological applications
• Nano-pigments
• Nano-materials for environment cleaning
  

Brief discussion of achievement :

The chemical methods for deposition of thin films of chalcogenides have developed using triethanolamine as complexing reagent. The films deposited are of PbS, PbSe, HgSe, Bi2S3, Bi2Se3, CdS, CdSe, NiS, NiSe, CoS, CoSe, ZnS, ZnSe, CuS, CuSe. Besides triethanolamine as an excellent slow releaser of metal ions for the formation of thin films, Thioacetamide has been introduced as sulfide ion releaser.

Poly-vinyl carbazole is an established photoconducting polymer for various applications. Poly [(N-ethylcarbazole) methane] has been synthesized and has been shown that it is more effective photoconducting polymer in presence of 2,4,7- trinitrofluorene.

The various silicate nano-powders have been synthesized by sol-gel methods using simple metal salts with tetraethylsilicate and water as solvent.

Coordination chemistry is a part of soft chemistry which was utilized by various branches of science and technology. The coordination phenomena generates extra stabilization of metal ions so that it can remain dissolved in solution even in presence of common precipitating agents. We have utilized this concept for making

the nano-sized multicomponent mixed oxides have been synthesized from the mixer of their co-ordination compounds. It has produced homogenous compositions and phase formation occurs at relatively lower temperature. With small modification of the process, the sizes of the ultimate powders may reach 10-30nm. These processes are successful for synthesis of nano-sized 1) Simple oxides 2) Spinels 3) Chromites 4) Aluminates 5) Manganites 6) Titanates 7) Zirconates 8) Niobates 9) Tanatalates 10) alloys of ferroelectric materials, and many others through complexation routes. The complexing agents used are Triethanolamine, Diethanolamine, Oxalic acid, Tartaric acid, Citric acid, Ethylenediamine tetraacetic acid (EDTA), and Nitrilotriacetic acid (NTA). The samples have been characterized by TEM, XRD and physical measurements.

Many meta stable oxide systems like 1) Fe 2O 3: Cr 2O 3 2) ThO 2: UrO 2 3) TiO 2: MO 2 (M= Cr, Mn, Ce, Pr, Tb) 4) CrPO 4: ABO 4 (A = Ni, Cu, Mn, Zn and B = Mo, W) have been Synthesized . All these metastable phases have many unusual physical and chemical properties.

As the coordination compounds can retard the rate of formation of precipitation reaction, by controlling the reaction conditions it may generate gel which may culminate into mesoporous materials in presence of templating agents which are mostly surfactants. Thus we have synthesized the mesoporous ZrSiO 3, Zr(HPO 4) 2, Sn(OH) 4, Nb 2O 5, Ta 2O 5, Zr(MoO 4) 2, Zr(WO 3) 2, Zr3 (VO4)4, TiO(HPO 4) etc.

Some of the mesoporous compounds like FeNbO4 shows excellent sensor properties for LPG, Alcohol etc at relatively lower temperature.Some of the nanoparticles shows excellent catalytic properties .

Nano-CuCrO4 has excellent catalytic properties for preparation of cumene from benzene, acetone and hydrogen.

In presence of complexing agent we have synthesized nano-rods of LnPO 4 and LnF 3 (where Ln = La, Y, Gd) doped with Eu 3+ and Tb 3+ having unique fluorescence properties.

Manetic nano-particles of Fe3O4 has been surface functionalized which helps the faster separation of histidine tagged protein, identification of tumor and cancer cells through MRI.