Pyrolyzed photoresist films PPF

The microstructure and surface chemistry of PPF have been studied as a function of the pyrolysis temperature (62-64). Raman spectra for PPF reveal the characteristic bands of sp carbon at -1358 and -1580 cm . The D (1358 cm ) and G (1580 cm ) bands 

Clean PPF films possess a low 5-10 pF cm and exhibit reladvely rapid electron-transfer kinetics for several outer-sphere redox systems. For instance, in the low to mid 10 cm sec range is observed for Ru(NH3)6 chlorpromazine andF CbOs (62-64). 

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SV detection was also achieved to detect catecholamines on a PDMS-quartz chip. Pyrolyzed photoresist films (PPF) were used as planar carbon electrodes. Since the photoresist (AZ4330) must adhere on a substrate for pyrolysis at 1000°C, a quartz plate that could withstand high temperature was selected. The LOD of dopamine decreased from 160 nM to 100 nM when the PPF was treated by piranha solution (HjSOyHjOj). It was because such a treatment increased the surface oxygen/carbon ratio, and hence the oxidation kinetics of dopamine wave improved [765]. 

Figure 10.3 Various structures of moiecuiar junctions commoniy used in moiecuiar eiec-tronics (a) Cross junction formed by perpen-dicuiariy oriented bottom and top contacts with a moiecuiar iayer sandwiched between the conductors. Typicai junction sizes range from severai square microns to a square mil-iimeter. (b) An aii-carbon molecular junction formed using pyrolyzed photoresist film (PPF) (on SiOj support) as a bottom contact, an evaporated carbon (eC) top contact, and a molecular layer consisting of a multilayer of biphenyl grafted using diazonium chemistry.

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