TY - JOUR
T1 - Effects of radio frequency power on the microstructures and properties of plasma polymerized polypyrrole thin films
AU - Li, Chuan
AU - Hsieh, J. H.
AU - Lee, Y. T.
N1 - Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2017/6/1
Y1 - 2017/6/1
N2 - Polypyrrole films, deposited on glass or silicon substrate by plasma polymerization under different radio frequency power and pyrrole flow rates, were investigated in this study. The plasma condition was monitored by optical emission spectrometer and films' properties and functions were assessed by following instruments: surface profiler for the average thickness and deposition rate; Fourier transform infrared spectroscopy for the microstructural vibration modes; optical spectrometer for transmittance, reflectance and absorbance and contact angle for wettability. Some discoveries were found from these material characterizations. A higher power results in faster deposition rates and thicker films. All deposited films are transparent and made of fragmented pyrrole such as C[sbnd]N, C[dbnd]N, C[dbnd]C and N[sbnd]H whereas for the main part of pyrrole C[dbnd]C[dbnd]C, N[dbnd]C[dbnd]C bonds are relatively weak, which implies most carbon rings are fractured by the plasma. After material characterizations, a set of optimal process parameters, i.e. power and flow rate were chosen to deposit the pyrrole film as a diffusion barrier for chemical release. The chemical, dexamethasone 21-phosphate disodium salt, sandwiched between polypyrrole and substrate was immersed in de-ionized water over time. The concentration of released DPS in water via deposited film was found to increase with time but saturates after 48 h.
AB - Polypyrrole films, deposited on glass or silicon substrate by plasma polymerization under different radio frequency power and pyrrole flow rates, were investigated in this study. The plasma condition was monitored by optical emission spectrometer and films' properties and functions were assessed by following instruments: surface profiler for the average thickness and deposition rate; Fourier transform infrared spectroscopy for the microstructural vibration modes; optical spectrometer for transmittance, reflectance and absorbance and contact angle for wettability. Some discoveries were found from these material characterizations. A higher power results in faster deposition rates and thicker films. All deposited films are transparent and made of fragmented pyrrole such as C[sbnd]N, C[dbnd]N, C[dbnd]C and N[sbnd]H whereas for the main part of pyrrole C[dbnd]C[dbnd]C, N[dbnd]C[dbnd]C bonds are relatively weak, which implies most carbon rings are fractured by the plasma. After material characterizations, a set of optimal process parameters, i.e. power and flow rate were chosen to deposit the pyrrole film as a diffusion barrier for chemical release. The chemical, dexamethasone 21-phosphate disodium salt, sandwiched between polypyrrole and substrate was immersed in de-ionized water over time. The concentration of released DPS in water via deposited film was found to increase with time but saturates after 48 h.
KW - Chemical diffusion
KW - Optical spectrometer
KW - Plasma polymerization
KW - Polypyrrole thin films
UR - http://www.scopus.com/inward/record.url?scp=84995784009&partnerID=8YFLogxK
U2 - 10.1016/j.vacuum.2016.09.009
DO - 10.1016/j.vacuum.2016.09.009
M3 - Article
AN - SCOPUS:84995784009
SN - 0042-207X
VL - 140
SP - 132
EP - 138
JO - Vacuum
JF - Vacuum
ER -