COMUNICAÇÃO TÉCNICA ______________________________________________________________________________________________________________________________________________________________________________________________________

Nº 176485

Development of microfluidic devices for graphene oxide fibers preparation Jaqueline Falchi da Rocha Roberta Mansini Cardoso Mario Ricardo Gongora-Rubbio Cecília Carvalho Castro e Silva

Pôster apresentado no BRAZIL-ARGENTINIE MICROFLUIDICS CONGRESS, 2., 2019, Córdoba-Argentina

A série “Comunicação Técnica” compreende trabalhos elaborados por técnicos do IPT, apresentados em eventos, publicados em revistas especializadas ou quando seu conteúdo apresentar relevância pública. ___________________________________________________________________________________________________

Instituto de Pesquisas Tecnológicas do Estado de São Paulo

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www.ipt.br

Optical Images of GO Fiber

Development of Microfluidic Devices

for Graphene Oxide Fibers Preparation Rocha, J. F. 1,2, Cardoso, R. M.2, Gongora-Rubio, M. R.2, Silva, C. C. C.1

1MackGraphe –Graphene and Nanomaterials Research Center, Mackenzie Presbyterian University, São Paulo, Brazil,

2Micromanufacturing Laboratory (LMI), Bionanomanufacturing Center, Technological Research Institute, IPT, São Paulo, SP, Brazil.

* email address: jaquefalchirocha@hotmail.com

ACKNOWLEDGEMENTS

EXPERIMENTAL

RESULTS

Annealing

30 min annealing time

300 °C

Ar/ H2

MW Treatment

100W

CTAB

Graphene Graphene and

Derivatives Fibers

Tensile strength

130 GPa

Tensile strength

501 mPa

Electric conductivity

108 S/m

Electric conductivity

4.1x104 S/m

Elastic modulus

1.1 TPa

Elastic modulus

11 GPa

Goal

Fiber

Applications Graphene and Derivatives

Fibers - Properties

CONCLUSIONS

Challenges INTRODUCTION

Cables and wires;

Microelectrodes;

Supercapacitors;

Wearable Devices;

Biosensors.

(LEE, C. et al JKMS v. 34, 2019 --- MENG, F. et al. Advanced Materials, v. 27, 2019)

(XU, Z. et al. Materials Today, v. 18, 2015 --- ZHEN, X. et al. Advanced Materials, v. 25, 2013)

Scalable preparation of the graphene derivatives fibers

keeping their unique properties.

Optimization of GO fibers preparation with hydrodynamically

focused ceramic based devices, followed by heat treatments

to obtain excellent quality reduced graphene oxide (rGO)

fibers.

Produce a hydrodynamically focused microfluidic device

based on Low Co-Fired Ceramics (LTCC) technology using

ceramic sheets to promote the best alignment of graphene

oxide (GO) sheets.

Modified Hummers’ Method

(HIRATA, M. et al. Carbon, v. 42, 2004)

(POTTS, J. R. et al. Advanced Materials, v. 45, 2012)

(VOIRY, D. et al. Science, v. 353, 2016)

GO Reduction

CTAB (0.05% m/v)

Addition of graphite, sodium nitrate and

sulfuric acid;

Wash with HCl (10%), Dyalisis until pH 5.5.

Raman Spectroscopy

SEM Images

Fibers Resistivity (ρ) (Ω . cm )

GO Fibers ND

rGO Fibers Annealing 37.83 x 10-3 ± (22.7x 10-3)

rGO Fibers Annealing + MW 5.24x10-3 ± (3.07 x 10-3)

Electrical Resistance

GO Fiber rGO Fiber

Annealing

rGO Fiber

Annealing

+ MW

Ceramic based hydrodynamic focusing devices have been shown to be able to produce

GO fibers in a scalable and quality manner. The MW heat treatment promotes an rGO

with structural properties similar to a CVD multilayer graphene. Thus rGO fibers are

excellent candidate for microsensor and microsupercapacior development.

GO Fiber rGO Fiber Annealing + MW

*n=7

Carbon Nanomaterial La (nm)

rGO Fibers Annealing + MW 204.0 ± ( 21.0)

CVD Graphene 186.0 *n=7

Electrical Resistivity Crystalline Domain Size (La)

Solution

Development of

Microfluidic Devices Graphene Oxide

(GOMES, H.C. et al. v. 9, Micromachines, 2018)

Thickness between 150-160 µm

Microfluidic Device

Flexible fibers

42 cm length

DRYING

Fiber - Microfluidic Devices

Effect of the

Coagulant Agente in

the Formation of the

GO Fibers

capa176485Rocha, J. F._II Congress_Brazil_Argentina__IV_Microfluidics-22 a 25.10.2019