Draft of my presentation of summer RET experience at Notre Dame working with Dr. Grace Xing in the Electrical Engineering department.

1. ISFET Devices and Connections to AP Chemistry R esearch E xperience for T eachers Symposium 2008 Phillip Cook

2. MESFET (top view) ISFET (side view) Source Drain Gate F ield E ffect T ransistors ( FET s)

3. Source Gate B rief F ET H istory

4. http://www.sentron.nl/nieuw/typo3temp/71a060e194.jpg C hemical S ensors

5. GaAs

6. B and G ap

7. http://www.sentron.nl/nieuw/typo3temp/71a060e194.jpg I SFET S ensor C omponents

8. I SFET F abrication n- GaAs p+ GaAs

9. C onstructing the R eference E lectrode

10. E xperimental S et-up

11. E xperimental S et-up

12. E xperimental S et-up

13. E xperimental S et-up

14. E xperimental S et-up

15. R esults

16. R esults pH 10 pH 4 pH 9 pH 7

17. Conducting Channel (150 nm n- GaAs) Source Ag/AgCl Reference Electrode (Gate) Substrate (p+ GaAs)

18. C lassroom C onnections

19. C lassroom C onnections

20. For more information on this RET project: Check out my blog: http://cookp.edublogs.org/retnd Contact Info Phillip Cook Email : [email_address] Twitter ID : cookp Blog : cookp.edublogs.org Special thanks to: Dr. Grace Xing Chuanxin Lian Rachel Rasmussen Xing Research Group