Using Electrostatic Force Cleaning to Purify PMMA Stained

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Using Electrostatic Force Cleaning to Purify PMMA Stained Graphene Christina Cox and Madelyn Fahhoum

Using Electrostatic Force Cleaning to Purify PMMA Stained Graphene Christina Cox and Madelyn Fahhoum CURENT, University of Tennessee- Knoxville Final Presentations July 16 -17 Knoxville, Tennessee

Overview Basics Goal Early Work Results Conclusions 2

Overview Basics Goal Early Work Results Conclusions 2

Graphene Explained • https: //www. youtube. com/watch? v=Q_e. TLPKdr. Hs 3

Graphene Explained • https: //www. youtube. com/watch? v=Q_e. TLPKdr. Hs 3

Graphene Explained Strongest material known to man Flexible honeycomb structure Transparent Conductive 4

Graphene Explained Strongest material known to man Flexible honeycomb structure Transparent Conductive 4

Applications Flexible durable phones Living tissue Megafast uploads 5

Applications Flexible durable phones Living tissue Megafast uploads 5

Goal • To obtain clean graphene for the purpose of implementation in transistors. What?

Goal • To obtain clean graphene for the purpose of implementation in transistors. What? When? Why? 6

Where We Come In • Production • Challenge: supporting the graphene- PMMA • Solution:

Where We Come In • Production • Challenge: supporting the graphene- PMMA • Solution: EFC • PMMA 7

PMMA Process • Poly(methyl methacrylate) • Solution Coating • Helpful • Challenging 8

PMMA Process • Poly(methyl methacrylate) • Solution Coating • Helpful • Challenging 8

Graphene Prep Step 1: Removal Step 2: Selection 9

Graphene Prep Step 1: Removal Step 2: Selection 9

Graphene Prep Continued Step 3: Spin-coating Step 4: Heating- 120 ˚C 10

Graphene Prep Continued Step 3: Spin-coating Step 4: Heating- 120 ˚C 10

Prep Work Continued Step 5: Cu Etchant Step 6: Transfer 11

Prep Work Continued Step 5: Cu Etchant Step 6: Transfer 11

EFC Method • “Rails”- slides • “Drum”- vial with microfiber cloth • Double-sided tape

EFC Method • “Rails”- slides • “Drum”- vial with microfiber cloth • Double-sided tape • Distance from graphene 12

Early Work • Optical microscope • Mechanical Contact • Choice of variable 13

Early Work • Optical microscope • Mechanical Contact • Choice of variable 13

Testing • Sample 1 -. 5 mm • Sample 2 - 1 mm •

Testing • Sample 1 -. 5 mm • Sample 2 - 1 mm • Sample 3 - 1. 5 mm • Continuous film issuesislands • Cu Removal issues • Recipe change Sample 1 14

Testing Continued • . 5 mm success! • Testing at. 35 mm and. 2

Testing Continued • . 5 mm success! • Testing at. 35 mm and. 2 mm • Inconsistency with continuous graphene 15

Conclusion • EFC is an effective method of cleaning graphene. • The smaller the

Conclusion • EFC is an effective method of cleaning graphene. • The smaller the distance between the graphene and the microfiber cloth, the more effective the cleaning. • The smallest amount of mechanical contact with graphene is very detrimental. 16

Works Cited http: //gizmodo. com/5988977/9 -incredible-uses-for-graphene http: //terahertztechnology. blogspot. com 2013_03_01_archive. html http: //img.

Works Cited http: //gizmodo. com/5988977/9 -incredible-uses-for-graphene http: //terahertztechnology. blogspot. com 2013_03_01_archive. html http: //img. chinaypages. com/v 2 f 80/3 b 7 e 3927 e 085 a 7 c 64 d 1 a 734 ecddb. jpg http: //farm 5. staticflickr. com/4091/5048567139_74 e 80643 fa_z. jpg http: //en. wikipedia. org/wiki/Poly(methyl_methacrylate http: //img. chinaypages. com/v/2 f/80/3 b 7 e 3927 e 085 a 7 c 64 d 1 a 734 ecddb. jpg 17

Acknowledgements CURENT, Dr. Gong Gu, Ali Mohsin 18

Acknowledgements CURENT, Dr. Gong Gu, Ali Mohsin 18