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Thin Film Laboratory

Department of Physics, Tripura University 

 Research Activities of the Group 

1. Langmuir-Blodgett (LB) Films: 

A. Spectroscopic and photophysical studies of non-amphiphiplic organic molecules assembled in the Langmuir-Blodgett Films are going on in our laboratory. Generally it is observed that non-amphiphilic molecules don't form stable Langmuir films at the air-water interface. However, when they are mixed with a long chain fatty acid (viz. stearic acid/ arachhidic acid) or an inert polymer (Polymethyl methacrylate / polystyrene), they from excellent Langmuir and Langmuir-Blodgett (LB) films. The spectroscopic properties of the molecules assembled in such a film are different to that in the solution or microcrystal. Recently we are studying the properties of the mixed LB films using various matrix elements (mainly inert polymer matrix). A comparison with various matrices is also our interest of study (see publication).

B. Other recent interest of the group lies in the investigation of the feasibility of formation of stable LB films of water soluble charge transfer types of molecules (see publication).

C. The group is also investigating the mixed LB films of various non-amphiphilic organic, metallo-organic and polymeric and water soluble molecules mixed with various inert polymer & fatty acid matrices, their optical and electrical characteristics.

D. Immobilization of biomolecules onto solid substrate using LB technique is our recent interest of study.

 To know the priliminaries of LB technique click here

2. Layer-by-Layer (LbL) Self assembled Films:

Layer-By-Layer (LBL) Self Assemble (SAM) type of mono- and multilayer film deposition using various anionic and cationic types of materials (see publication) is going on in our laboratory. A comparison of these SAM films with the films fabricated by LB technique is under investigation to optimize the deposition technique suitable for different materials for specific applications.

3. Spin Coated Films:

         In some cases Spin Coating Technique is also used for the preparation of thin films.

 4. Material of interest:

           Organic, metallorganic, dyes, biomolecules (DNA, RNA, Lipid etc), clays, water soluble materials, amphiphilic and non-amphiphilic molecules.

5. Characterization Techniques:

                  UV-Vis absorption and Steady state Fluorescence Spectroscopy, FTIR Spectroscopy, AFM, SEM, XRD etc.

 6. Instruments available in our Laboratory:

(i) One Langmuir Blodgett Film deposition instrument (Apex)
(ii) One UV-Visible Absorption Spectrophotometer (Perkin Elmer)
(iii) One Fluorescence Spectrophotometer (Perkin Elmer)
(iv) One spin Coating unit (Apex)
(v) Millipore Ultrapure Watre purification system (18.2 M-ohm)
(Vi) Gaussian Ink 03 Software