Studies on thin film properties and application of self organized nanoparticles | |
| Author | Sujira Promnimit |
| Call Number | AIT Diss. no.ME-08-02 |
| Subject(s) | Nanoparticles Thin films, Multilayered |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Technical Science in Microelectronics Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. ME-08-02 |
| Abstract | The method in which macromolecules and nanoparticles are self-organized into assemblies to create novel nanostructures is getting increasing research attention. Nanoparticles based multilayer thin films through layer-by-layer (lbl) self assembly process relies on electrostatic interaction of charged nanoparticles on flat substrates are reported as an interesting alternative for the fabrication of electronic devices. The thin films were constructed by alternately dipping a substrate into a colloidal suspension of chitosan capped zinc sulphide (ZnS) nanoparticles (~30 nm) and citrate stabilized colloidal gold (Au) nanoparticles (~20 nm) consisting of up to 200 deposition cycles have been studied. The surface morphology, changes in the optical absorption characteristics, thickness, uniformity, roughness and electrical characteristics are studied in this thesis. The multilayered assemblies, attached to the surface by strong ionic bonds, were highly stable and could not be removed by moderate scratching. Current-voltage characteristics of multilayer devices with an increasing number of deposition cycles show an initial current blockade until an onset voltage value, which increases linearly upon the addition of the number of the layers stacked in devices. A conductive behaviour of the device could be observed after exceeding the onset voltage. Moreover, the current-voltage behavior showed that the conduction onset voltage increases linearly depending on the numbers of layers in the final device controlled by the deposition cycles. The multilayer films can be applied to detect pressure with satisfactory results where the conduction onset voltage decreases linearly with the applied pressure. Systematic current-voltage characteristics in the forward and reverse biased conditions demonstrated rectifying behavior in the onset of conduction voltage which makes these films attractive for future electronic devices.iii |
| Year | 2008 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. ME-08-02 |
| Type | Dissertation |
| School | School of Engineering and Technology (SET) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Microelectronics (ME) |
| Chairperson(s) | Dutta, Joydeep; |
| Examination Committee(s) | Bohez, Erik L. J. ;Chanchana Thanachayanont; |
| Scholarship Donor(s) | Royal Thai Government (RTG) ;University Development Commission (UDC) ;Deutscher Akademischer Austausch Dienst (DAAD); |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology, 2008 |