Dear all,
Hope you're doing well.
I am doing research on CNTs in glucose biosensors.
I have optimized my CVD and now I can grow CNTs with high crystallinity and good aspect ratio.The optimized CNTs are used for fabrication of glucose biosensor (GOD based biosensor with mediator ). Surprisingly the sensors fabricated by the optimized CNTs shows better sensitivity and stability than the sensors which was fabricated by the usual CNTs!!!
which reason is correct ?
1.The defects of the CNTs are decreased in optimization process and the conductivity increased.(But why I have better stability ?)
2.The surface area of the optimized CNTs is increased and the GOD is immobilized better than the usual CNTs.(But why I have better sensitivity ?)
3.The optimized CNTs links better with GOD?
4.The optimized CNTs have more chance to entrap CNTs?
5.Or any other reasons?
Please kindly let me know your opinion .
Regards
Amin
It could be a variety of reasons. Is you mediator in solution or part of a redox polymer or ? What is your mediator? How are you immobilizing the GOD? Have you compared the electrochemically accessible surface area and conductivity of your CNT electrode versus the usual CNT electrode? In the case of mediator-based GOD biosensor, then GOD is not in electrochemical communication with the CNT, but it is possible that the surface chemistry of the CNT allows you to immobilize more GOD, but that depends on your immobilization material.
Dear Amin, I guess you have to determine if CNT's you are using contains functional groups, formed maybe during purification process. Linkage of molecules to CNT's are strongly dependent to functional groups.