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URN etd-0822117-095442 Statistics This thesis had been viewed 296 times. Download 0 times. Author Ching-Ting Peng Author's Email Address No Public. Department Mechanical Engineering Year 2016 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 87 Title The Effects of Annealing and Plasma Treatment on the Optical and Electrical Properties of Silver Nanowires Film Keyword silver nanowires silver nanowire films annealing surface wettability surface wettability annealing silver nanowire films silver nanowires Abstract Many factors affect the performance of silver nanowires (AgNWs) as transparent conductive films e.g. wire length, diameter, deposition, annealing and substrate wettability. In this study, we investigate the effects of annealing and substrate wettability on AgNW films and the associated mechanisms. In annealing effect, the different diameter size AgNWs were drop-casting on glass substrate and then on a hot plate at various temperature as annealing. In substrate wettability, the glass was under different plasma treatment to modify its wettability. The electrical, optical and surface properties in AgNW films were examined by 4 point probe, spectrometer and SEM, respectively.
The results indicate for annealing under certain temperature, the electrical properties are improved as long as the temperature is less than 200 degree C. The annealing mechanism in different in various temperature range. For annealing temperature 100 degree C, the evaporation of residual PVP particles leads to the reduction of resistivity. As the annealing temperature raised to 150-200 degree C, the fusion of inter-connection between AgNWs results in further improvement of conductivity. When the annealing temperature is 250-300 degree C, the AgNWs become spheroidization and the networks between AgNWs disappear and the conductivity of AgNWs breaks down. Different annealing temperature seems to be insensitive to optical properties and the variation is less than 5%. On the other hand, the electrical conductivity can be improved up to 77%.
The wettability of substrate surface can be modified by different plasma treatment. The results show when AgNWs deposited on hydrophobic substrate surface, AgNWs tends to aggregate. On the other hand, there is more dispersion when AgNWs deposited on hydrophilic substrate surface. This distribution of AgNWs influence the associated electrical property. The conductivity of AgNW films became worse when AgNWs deposited on hydrophobic surface. The aggregation of AgNWs reduces the number of junction might be the reason. However, the more dispersive AgNWs on hydrophilic surface improves the conductivity by increasing the network interconnectivity. The large diameter AgNWs tends to form aggregation and this explain why smaller AgNWs has better conductivity.
Advisor Committee Chehung Wei - advisor
Shinn-Shyong Tzeng - co-chair
Wen-Hsien Sun - co-chair
Files Date of Defense 2017-07-06 Date of Submission 2017-08-23