Browsing by Supervisor "Ashwell, G. J."

Browsing by Supervisor "Ashwell, G. J."

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  • Alignment and rectifying properties of donor-electron bridge-acceptor molecules 
    Sujka, Marta (Cranfield University, 2007-06)
    Molecular electronics based on the bottom-up approach appears to be a promising alternative to overcome the limitations of the top-down lithographic fabrication of electronic devices. The ability to manipulate single or ...
  • Analysis of rectifying molecular thin films 
    Miller, James R. (Cranfield University, 2005-09)
    The mercury-drop electrode technique, when used to measure the current/voltage characteristics of thin films of molecular rectifiers, is a useful, if awed method of analysis. Current/voltage plots taken from a number ...
  • Electrical rectification from aligned diodesbased on the donor-(π-bridge)-acceptor molecules 
    Chwialkowska, Anna (Cranfield University, 2007-04)
    As traditional devices containing silicon transistors begin to approach their physical limits, new systems composed of organic molecules are being considered for molecularscale devices of the future. The present work ...
  • Electrical, magnetic and optical characterisation of donor-acceptor systems 
    Martin, P. J. P. (Cranfield University, 1991-07)
    Three novel donor-acceptor systems have been characterised through their spectroscopic properties, magnetic susceptibility, conductivity and second harmonic generation. The magnetic properties of (H2DPE)xx+(DPE)^ x(TCNQ)gX ...
  • Fibre optic chemical sensing using Langmuir-Blodgett overlay waveguides 
    Flannery, D. (Cranfield University, 1998-04)
    Fibre optic chemical sensing has been demonstrated using side-polished single mode optical bre, evanescently coupled to chemically sensitive Langmuir-Blodgett overlay waveguides. The sensors exhibit a channel dropping ...
  • Langmuir-Blodgett films of porphyrins and phthalocyanines 
    Portus, Dan (Cranfield University, 2002)
    Phthalocyanines and porphyrins have been studied for many years as bulk, thick and thin films. Their use in Langmuir and Langmuir-Blodgett films is governed their peripheral substituents. These can enhance or reduce their ...
  • The non-linear optical and gas sensing properties of ultra-thin films 
    Roberts, M. P. S. (Cranfield University, 1997-12-17)
    It is not often that a single experiment opens up a new direction of research. In this report, the optical properties of a series of organic molecules, of the form 2,4-bis((N-methyl-N-alkylamino)phenyl)squarine, which ...
  • Nonlinear optical materials 
    Thompson, Peter Anthony (Cranfield University, 1994-06)
    Twenty different materials have been successfully deposited as Langmuir- Blodgett monolayer films. All exhibit second harmonic generation (SHG) when irradiated with laser light at 1064 nm. E-1-docosyl-4-{2-(4-dimethylami ...
  • Optical and structural characterisation of ultra-thin films 
    Skjonnemand, K. (Cranfield University, 2000-07)
    Chloride, bromide, pyridinium and quinolinium homologues of 4-(N- hexadecylpyridinium-4-ylmethylidene-amino)-2,6-dichlorophenolate have been investigated in solution, Langmuir and Langmuir-Blodgett films. Techniques ...
  • Self-assembled films for molecular rectification 
    Tyrrell, Wayne David. (Cranfield University, 2004-10)
    The original model for molecular rectification was proposed by Aviram and Ratner (Chemical Physics Letters, 1974, 29, 277-284.), who suggested that donor-electron bridge-acceptor molecules could be organic counterparts ...
  • Zwitterionic materials for photonic applications 
    Kuczynski, Andrzej. Piotr. (Cranfield University, 1992-07)
    A series of zwitterionic materials of general formula R-D*-CH=C(CN)- CÖH4-C(CN)2', where D* is a pyridirium or quinolinium acceptor and R is a hydrophobic alkyl chain or an aryl group, were deposited using the ...