ELECTRICITY CONDUCTIVE COTTON FABRIC USING REDUCED GRAPHENE OXIDE DYE

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ELECTRICITY CONDUCTIVE COTTON FABRIC USING REDUCED GRAPHENE OXIDE DYE Nadeeka D. Tissera

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PowerPoint Presentation:

Hosted by: ELECTRICITY CONDUCTIVE COTTON FABRIC USING REDUCED GRAPHENE OXIDE DYE Nadeeka D. Tissera

Electricity conductive cotton fabric using reduced graphene oxide dye:

Electricity conductive cotton fabric using reduced graphene oxide dye Company Confidential 2 Nadeeka D. Tissera a * , Ruchira N. Wijesena a , Yasun Y. kannangara a , K.M. Nalin de Silva a a Sri Lanka Institute of Nanotechnology, Sri Lanka, * nadeekat@slintec.lk ,

Content:

Introduction Objective of the study Experimental methods Results and discussion conclusion Content Company Confidential 3

Introduction:

Introduction Company Confidential 4

PowerPoint Presentation:

Company Confidential 5 Electricity conductivity of graphite and reduced graphene oxide nano sheets The global market for graphene is reported to have reached $9 million by 2014 with most of these sales being concentrated in the semiconductor, electronics, battery energy and composites Maximum reported electricity conductivity for graphite structures was 55800 S/m

PowerPoint Presentation:

6 Electricity conductive textiles Electronic or conductive textiles Applications: As conductive touch screen cotton gloves with more breathability To be used as an anti static material. No clinging of materials, lead to easy handling while wearing the glove Carbon fibers Electricity conductive fabric using single wall carbon nano tubes rGO coated acrylic fabric CNT coated acrylic fabric Graphene colored fabric showed 92.5 Ω / cm

Objectives of the study:

Objectives of the study Company Confidential 7

Use graphene as a dye to impart electric conductivity on cotton fabric:

Use graphene as a dye to impart electric conductivity on cotton fabric Company Confidential 8 Main objective : Obtain electricity conductive property on fabric surface Use simple dyeing method to obtain conductivity on cotton fabric use cost effective material to achieve conductivity on the fabric Method : Obtain graphite oxide from vein graphite Obtain graphene oxide dispersion in water to be used as the dye bath Use normal dyeing procedure to dye the fabric During dyeing process select most effective reducing agent to achieve in situ reduction of the graphene oxide on the fiber surface of the fabric

Experimental method:

Experimental method Company Confidential 9

Preparation of graphene oxide from vein graphite:

Preparation of graphene oxide from vein graphite 10 Method of preparation: Use improved hummers method to obtain graphite oxide from vein graphite

Incorporation of conductive nano material to cotton fabric:

Incorporation of conductive nano material to cotton fabric 11 Exhaustion dyeing method to incorporate reduced graphene oxide to the cotton fabric 30 30 30 30 RT 80 °C Dye bath Temperature (◦C) Time (minute) Graphite Oxide 5% OWF MLR 1:40 Use ultrasound to obtain graphene oxide dispersion in water Add cotton fabric Add reducing agent 20 ml of 2 M ol solution Dispense the dyed fabric wash with cold water dried using an oven at 80 °C Dispense a sample out for analysis

Results and discussion:

Results and discussion Company Confidential 12

Analysis of synthesized graphene oxide- AFM & XRD characterization:

Analysis of synthesized graphene oxide- AFM & XRD characterization 13 Atomic force microscopic images of exfoliated graphite oxide Average layer thickness of 1-2nm Lateral size of 1- 2 µm XRD characterization of graphite and prepared graphene oxide vein graphite shows a strong, sharp peak at 27°, which corresponds to a basal spacing d 002 = 0.334 nm. synthesized graphite oxide, exhibits a peak at 10° corresponding to a basal spacing of d 001 = 0.961nm

Analysis of synthesized graphene oxide- FTIR characterization:

Analysis of synthesized graphene oxide- FTIR characterization 14 FT-IR analysis of synthesized GO Chemical structure for GO

Chemical reduction and electricity conductivity of graphene oxide:

Chemical reduction and electricity conductivity of graphene oxide 15 Sodium Boro Hydride ( NaBH ) Sodium hydrosulphite ( NaHS ) SP 2 / SP 3 hybridization increase C/O ratio increase Chemical reduction

Analysis of reduced graphene oxide (rGO) dyed cotton fabric – SEM micrographs:

Analysis of reduced graphene oxide (rGO) dyed cotton fabric – SEM micrographs 16 Cotton fiber surface GO coated cotton fiber rGO loaded fiber rGO loaded fiber

Analysis of reduced graphene oxide (rGO) dyed cotton fabric – AFM micrographs:

Analysis of reduced graphene oxide (rGO) dyed cotton fabric – AFM micrographs 17 Atomic Force Microscope images of non treated and GO loaded yarn surface using non contact mode analysis method The scanned AFM images for the GO-Cotton samples showed a coating on the fiber surface which have smoothened the natural ridges and grooves present on normal cotton fiber surface the deposition of grapehen oxide allows the surface to be more uniform compared to the untreated cotton fiber. The SEM and AFM data confirm that graphene oxide is deposited as a uniform conformal coating on the cotton fiber surface.

Analysis of reduced graphene oxide (rGO) dyed cotton fabric – UV-VIS spectrophotometer:

Analysis of reduced graphene oxide (rGO) dyed cotton fabric – UV-VIS spectrophotometer Company Confidential 18 Change in SP 3 hybridization to SP 2 hybridization Shift of absorption peak from 230 nm to 267 nm indicate deoxygenation of the grafted GO on the fabric & evidence of restoration of aromatic carbon structure

Analysis of reduced graphene oxide (rGO) dyed cotton fabric – UV-VIS spectrophotometer:

Analysis of reduced graphene oxide (rGO) dyed cotton fabric – UV-VIS spectrophotometer Company Confidential 19

Electricity conductivity of dyed cotton fabric:

Electricity conductivity of dyed cotton fabric Company Confidential 20 NaHS reduction NaBH reduction NaHS reduced NaBH reduced Normal cotton Sample description Resistance per 1 cm NaHS reduced dyed fabric 16.3 k Ω NaBH reduced dyed fabric 23.4 M Ω

Conclusion:

Conclusion Company Confidential 21

Flexible wearable conductive cotton fabric:

Flexible wearable conductive cotton fabric Company Confidential 22 Was able to successfully incorporate carbon nano structure (graphene oxide ) in to cotton fabric Sodium hydrosulphite proved having superior reducing ability of graphene oxide rGO grafted on the cotton fabric showed good wash fastness Conductive cotton fabric was obtained using simple exhaustion dyeing method

Thank you:

Thank you Company Confidential 23

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