Dear Bertie,

Please read the GO sample preparation taken from "Graphene Oxide Thin Films: A Simple Profilometer for Film Thickness Measurement" published in International Journal of Engineering and Advanced Technology IJEAT)

ISSN: 2249 – 8958, Volume-2, Issue-3, February 2013

A. Sample preparation

For synthesis of GO we have selected well known method Hummers Method [8] from graphite flakes as described in our previous work [9]. Homogenous graphene oxide aqueous suspension with a concentration of 0.05grams of GO was  suspended in 20ml Water of and 20ml of Ethylene Glycol in two different beakers. Then after the solutions sonicated by probe type sonicator for 2 hrs for uniform aqueous solution.2grams of PVP(Polyvinyl Pyrrolidone) was added to the aqueous solution and stirred at 800C for 5hours. The GO suspension was then spin coated at 6000 rpm for 30 s with a spin coating apparatus[10-14] (HOLMARC Spin

coater-model: HO-TH-05) on clean fluorine doped tin oxide (FTO), indium tin oxide (ITO) substrates and glass slides, which were first washed with acetone, ethanol and deionized water for 10 min successively under the assistance of  ultrasonication. The GO thin films were obtained after drying at room temperature for 24 hrs as shown in Fig.1.

Hoping this will be helpful,

Rafik

Dear Bertie,

Please read the GO sample preparation taken from "Graphene Oxide Thin Films: A Simple Profilometer for Film Thickness Measurement" published in International Journal of Engineering and Advanced Technology IJEAT) (see attached file)

ISSN: 2249 – 8958, Volume-2, Issue-3, February 2013

A. Sample preparation

For synthesis of GO we have selected well known method Hummers Method [8] from graphite flakes as described in our previous work [9]. Homogenous graphene oxide aqueous suspension with a concentration of 0.05grams of GO was  suspended in 20ml Water of and 20ml of Ethylene Glycol in two different beakers. Then after the solutions sonicated by probe type sonicator for 2 hrs for uniform aqueous solution.2grams of PVP(Polyvinyl Pyrrolidone) was added to the aqueous solution and stirred at 800C for 5hours. The GO suspension was then spin coated at 6000 rpm for 30 s with a spin coating apparatus[10-14] (HOLMARC Spin

coater-model: HO-TH-05) on clean fluorine doped tin oxide (FTO), indium tin oxide (ITO) substrates and glass slides, which were first washed with acetone, ethanol and deionized water for 10 min successively under the assistance of  ultrasonication. The GO thin films were obtained after drying at room temperature for 24 hrs as shown in Fig.1.

Hoping this will be helpful,

Rafik

Thanks for the reply Rafik, and for the attached paper. However, we are looking for filtration techniques in particular. Spin-coating is an option if filtration doesn't succeed.

Thanks for the reply Rafik, and for the attached paper. However, we are looking for filtration techniques in particular. Spin-coating is an option if filtration doesn't succeed.

Attached is a recent paper on filtration.

Methods

Fabrication and transfer of the hybrid thin films. Vacuum filtration was applied to

fabricate the hybrid thin films using poly(3,4-ethylenedioxythiophene) doped with

poly(styrenesulfonate) (PEDOT:PSS) as the matrices. PEDOT:PSS was purchased

from Heraeus under the trade name Clevios PH 500, with initial concentration of 10–

13 mg/mL in water.

Rafik