Journal Papers

1. The optical and electrical properties of properties of RF and ac plasma

polymerized aniline thin films U.S.Sajeev, C.Joseph Mathai, S.Saravanan,

Rajeev.R.Ashokan, S.Venkatachalam, M.R.Anantharaman Bull. of Mater. Sci.

29, (2006), p159

2. Evidence for intergranular tunnelling in Polyaniline passivated α -Fe nano

particles. Vijutha Sunny, T N Narayanan, U S Sajeev, P A Joy, D Sakthi

Kumar, Yasuhiko Yoshida and M R Anantharaman (Nano technology)

3. Magnetic field induced assembling of nanoparticles in ferrofluidic liquid thin

films based on NixFe1-xFe2O4, V.S. Abraham, S. Swapna Nair, S. Rajesh, U.S

Sajeev and M.R Anantharaman, Bull. Mater. Science, 27 (2), 2004, pp165.

4. Optically transparent and electrically semi conducting thin films based on tea

tree oil by RF plasma polymerization: Mohan V. Jacob, U. S. Sajeev, and

Rajeev. R. Ashokan, M.R.Anantharaman (Communicated)

5. Insitu doping of phenyl hydrazine thin films with iodine for the

Modification of optical and electrical properties: U. S. Sajeev and

M.R.Anatharaman (Communicated)

6. Studies on

Conference Papers

7. The optical and electrical properties of poly aniline thin films deposited

under rf and ac plasma polymerization U.S.Sajeev, C.Joseph Mathai,

S.Saravanan, S.Venkatachalam, M R Anantharaman DAE-BRNS symposium

on application of Plasma, Laser and Electron beam in Material processing to

be held at Babha Atomic Research Centre, Mumbai during September 23-26,

2002

8. .Modification of magnetic and electrical properties of NixFe1-xFe2O4 by

polymer surface coating, M.R. Anantharaman, P.A. Joy, S. Swapna Nair, U.S

Sajeev and V. Sooraj. International conference in inorganic materials,

Andwerp, Belgium, Accepted.

9. Surface Modification of Magnetic Nanoparticles by RF Plasma

Polymerisation, V. Sooraj, U.S Sajeev, S. Swapna Nair, M.R.Anantharaman.

National Symposium on Instrumentation 28, Vallabhai Panth University,

Panth Nagar, Utharanchal, Nov. 1-3, 2003.

10. Surface Modification of Ultrafine Iron Particles by Plasma Polymerized

Aniline. Vijutha Sunny, U. S. Sajeev, S. Swapna Nair, P.A.Joy,

M.R.Anantharaman, DAE-BRNS Symposium, BARC, 2004 September,

11. Saturable absorption in plasma polymerized aniline thin films probed by z-

scan technique: U.S. Sajeev, Vinu.V. Namboodiri, Anwar Salah, V.P.N

Nampoori, P.Radhakrishnan., M.R.Anantharaman. Presented in Photonics

2004 (International Seminar), Cochin , Kerala, India, 2004 December.

12. Band gap Tuning in RF Plasma Polymerised Tea Tree oil Thinfilms by Swift

Heavy Ion Irradiation: Rajeev. R. Ashokan, M.R.Anantharaman,

D.K.Avasthi, Sajeev U.S, Mohan Jacob, Ambuj Tripathi. Presented in

International Seminar on Optoelectronic Materials and Thin Films for

Advanced Technology (OMTAT-2005), Cochin, Kerala, India, 2005

October.

13. Evidence for the Occurrence of Inter Granular Tunnelling in Passivated

Ultrafine Fe Particles with Polyaniline: Vijutha Sunny, T.N. Narayanan,

U.S.Sajeev, M.R.Anantharaman, Presented in International Seminar on

Optoelectronic Materials and Thin Films for Advanced Technology

(OMTAT-2005), Cochin, Kerala, India, 2005 October.

14. Urbach Tail Analysis of Pristine and iodine doped Polypyrrole Thinfilms

Prepared by AC plasma Polymerisation, Joseph John, U.S.Sajeev,

M.R.Anantharaman, S.Jayalekshmi. Presented in International Seminar on

Optoelectronic Materials and Thin Films for Advanced Technology

(OMTAT-2005), Cochin, Kerala, India, 2005 October.

15. Persistent Photoconductivity in AC Plasma Polymerised Phenyl Hydrazine

thin films, U.S.Sajeev, M.A.Sanoj, Hysen Thomas, M.R.Anantharaman:

Presented in International Seminar on Optoelectronic Materials and Thin

Films for Advanced Technology (OMTAT-2005), Cochin, Kerala, India,

2005 October.

List of Abbreviations

1 Alternating Current ac 2 Camphor Sulphonic Acid CSA 3 Effective Medium Approximation EMA 4 Electroluminescent EL 5 Excited State Absorption ESA 6 Fourier Transform Infrared FTIR 7 Gaussian Broadened Polynomial Superposition GBPS 8 Highest of the Occupied Molecular Orbit HOMO 9 Indium Tin Oxide ITO 10 Integrated Circuit IC 11 Kramers-Kronig KK 12 light emitting diodes LED 13 Linear Variable Differential Transformer LVDT 14 Lowest of the Unoccupied Molecular Orbit LUMO 15 Mean Square Error MSE 16 Metal-Polymer-Metal M-I-M 17 Nonlinear Optical NLO 18 Nuclear Magnetic Resonance NMR 19 Phenyl Hydrazine PH 20 Photo Refractive PR 21 Plasma Polymerised Phenyl Hydrazine PPH 22 Plasma Polymerised Polyaniline PPANI 23 Plasma Polymerised Tea Tree Oil PPTTO 24 Polyaniline PANI 25 Radio Frequency rf 26 Saturable Absorption SA 27 Source Measurement Unit SMU 28 space charge limited current SCLC 29 Spectroscopic Ellipsometry SE 30 Super paramagnetic ion oxide nanoparticles (SPION) SPION 31 Trap Charge Limited Current TCLC 32 Trap Filled Limit TFL 33 Two photon absorption TPA 35 Ultra Violet- Visible-Near Infrared UV-Vis-NIR 36 Variable Angle Spectroscopic Ellipsometry VASE

1

List of figures Chapter 7

Spectroscopic Ellipsometric characterisation of plasma

polymerised aniline films 7.1 SEM/AFM photographs of RF plasma polymerised aniline thin films. a)

Pristine b)Iodine doped.

7.2 SE Experimental spectra of ellipsometric angles for the plasma polymerized

films of polyaniline (PANI) as acquired at various angles of incidence. The model

fit is also shown.

7.3 SE Experimental spectra of ellipsometric angles for the plasma polymerized

films of poly aniline iodine doped (PANI) as acquired at various angles of

incidence. The model fit is also shown.

7.4 SE Experimental spectra of ellipsometric angles and for the plasma

polymerized films of poly aniline (PANI) as acquired at various angles of

incidence. The model fit is also shown.

7.5 SE Experimental spectra of ellipsometric angles and for the plasma

polymerized films of poly aniline doped (PANI) at various angles of incidence.

The model fit is also shown.

7.6 Pseudo dielectric constant (real) of plasma polymerised polyaniline sample in its

pristine form. For different values of the angle of incidence. The model fit is also

shown

7.7 Pseudo dielectric constant (real) of plasma polymerised polyaniline sample in its

iodine doped form. For different values of the angle of incidence. The model fit is

also shown.

7.8 Pseudo dielectric constant (imaginary) of plasma polymerised polyaniline sample

in its pristine form for different values of the angle of incidence. The model fit is

also shown.

7.9 Pseudo dielectric constant (imaginary) of plasma polymerised polyaniline sample

in its iodine doped form for different values of the angle of incidence. The model

fit is also shown.

7.10 The averaged value of pseudo dielectric functions (real) of the RF PANI films

2

7.11 The averaged value of the imaginary part of dielectric constants for pristine and

iodine doped films.

7.12 Second derivative of Epsilon2 of pristine PANI thin film. Minimum corresponds

to the critical point energies. The figure shows two optical transitions; the

fundamental optical band gap at 3.185eV and second transition at 4.178eV

7.13 Second derivative of Epsilon2 of iodine doped sample. Minimum corresponds to

the critical point energies. The figure shows three optical transitions; the

fundamental optical band gap at 1.66eV, second transition at 2.396eV and the

third at 2.825eV.

7.14 Optical constants, n and k of pristine plasma polymerised aniline film obtained

from the best fit

7.15 Optical constants, n and k of iodine doped plasma polymerised aniline film obtained

from the best fit

7.16: The real part of the optical conductivity of the thin films. The inset shows the log

(real part of the optical conductivity) vs. Photon energy in log scale.

7.17 Imaginary parts of the optical conductivity