Reductant-free synthesis conditions for water-dispersible reduced graphene oxide
Reduced graphene oxide (rGO) is the demanded material for large-scale graphene applications due to the relative ease of preparing sufficient quantities with the desired properties. Herein, optimized preparation conditions for water-dispersible rGO using the one-step chemical exfoliation method are r...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2024-01-01
|
| Series: | Next Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949822823000588 |
| _version_ | 1797237752134107136 |
|---|---|
| author | Gebremedhin Gebremariam Gebreegziabher Desta Gebremedhin Gebrehiwot Elias Assayehegn Gebrehiwot Gebreslassie |
| author_facet | Gebremedhin Gebremariam Gebreegziabher Desta Gebremedhin Gebrehiwot Elias Assayehegn Gebrehiwot Gebreslassie |
| author_sort | Gebremedhin Gebremariam Gebreegziabher |
| collection | DOAJ |
| description | Reduced graphene oxide (rGO) is the demanded material for large-scale graphene applications due to the relative ease of preparing sufficient quantities with the desired properties. Herein, optimized preparation conditions for water-dispersible rGO using the one-step chemical exfoliation method are reported. The rGO samples were obtained from graphite under different controlled reaction conditions, i.e., temperature (120, 140, and 160 °C) and time (16, 20, and 24 hrs). The microstructural, chemical, wetting, and electrical properties of samples were characterized using Raman spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, contact angle measurement, current-voltage (I–V) characteristic, and electrochemical impedance spectroscopy (EIS), respectively. The Raman parameter (i.e., the ID/IG values) was used to assess the quality of rGO materials. Accordingly, rGO160@20 showed the smallest ID/IG value (0.57) compared to the rest of the samples, followed by rGO160@16 and rGO120@24 with 0.75 and 0.77 values, respectively. The observed broad and diffused peaks centered at 2θ = 25° from XRD are the finger-print characteristics of rGO samples. FT-IR (mainly due to -OH) and lower contact angle values (≤ 33 °C) analysis confirmed the hydrophilic nature of these samples. The samples' non-linear I-V characteristics were attributed to disordered dielectric barriers. The charge transfer resistances (Rct) at the electrode/electrolyte interface were 21.65 for rGO160@20 and 25.65 for rGO160@16 and rGO120@24. EIS analysis also confirmed the rGO samples have supercapacitor behavior. Experimental parameters' synergistic effects influenced sample microstructure. Optimal processing conditions of rGO samples were also achieved for energy storage and applications that need graphene water dispersion. |
| first_indexed | 2024-04-24T17:24:44Z |
| format | Article |
| id | doaj.art-4db047f9748d4fab88e8a55797ebe567 |
| institution | Directory Open Access Journal |
| issn | 2949-8228 |
| language | English |
| last_indexed | 2024-04-24T17:24:44Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Next Materials |
| spelling | doaj.art-4db047f9748d4fab88e8a55797ebe5672024-03-28T06:41:11ZengElsevierNext Materials2949-82282024-01-012100058Reductant-free synthesis conditions for water-dispersible reduced graphene oxideGebremedhin Gebremariam Gebreegziabher0Desta Gebremedhin Gebrehiwot1Elias Assayehegn2Gebrehiwot Gebreslassie3Department of Chemistry, Mekelle University, P.O. Box 231, Mekelle, Ethiopia; Tezpur University, Department of Physics, Material Research Laboratory, Napaam, Tezpur, Assam 784028, India; Correspondence to: Gebremedhin Gebremariam Gebreegziabher, Department of Chemistry, Mekelle University, P.O. Box 231, Mekelle, Ethiopia.Department of Chemistry, Mekelle University, P.O. Box 231, Mekelle, EthiopiaDepartment of Chemistry, Mekelle University, P.O. Box 231, Mekelle, EthiopiaDepartment of Industrial Chemistry, Addis Ababa Science and Technology University, P.O.Box 16417, Addis Ababa, EthiopiaReduced graphene oxide (rGO) is the demanded material for large-scale graphene applications due to the relative ease of preparing sufficient quantities with the desired properties. Herein, optimized preparation conditions for water-dispersible rGO using the one-step chemical exfoliation method are reported. The rGO samples were obtained from graphite under different controlled reaction conditions, i.e., temperature (120, 140, and 160 °C) and time (16, 20, and 24 hrs). The microstructural, chemical, wetting, and electrical properties of samples were characterized using Raman spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, contact angle measurement, current-voltage (I–V) characteristic, and electrochemical impedance spectroscopy (EIS), respectively. The Raman parameter (i.e., the ID/IG values) was used to assess the quality of rGO materials. Accordingly, rGO160@20 showed the smallest ID/IG value (0.57) compared to the rest of the samples, followed by rGO160@16 and rGO120@24 with 0.75 and 0.77 values, respectively. The observed broad and diffused peaks centered at 2θ = 25° from XRD are the finger-print characteristics of rGO samples. FT-IR (mainly due to -OH) and lower contact angle values (≤ 33 °C) analysis confirmed the hydrophilic nature of these samples. The samples' non-linear I-V characteristics were attributed to disordered dielectric barriers. The charge transfer resistances (Rct) at the electrode/electrolyte interface were 21.65 for rGO160@20 and 25.65 for rGO160@16 and rGO120@24. EIS analysis also confirmed the rGO samples have supercapacitor behavior. Experimental parameters' synergistic effects influenced sample microstructure. Optimal processing conditions of rGO samples were also achieved for energy storage and applications that need graphene water dispersion.http://www.sciencedirect.com/science/article/pii/S2949822823000588Controlled synthesisTailoring microstructureWater-dispersibleReduced graphene oxide |
| spellingShingle | Gebremedhin Gebremariam Gebreegziabher Desta Gebremedhin Gebrehiwot Elias Assayehegn Gebrehiwot Gebreslassie Reductant-free synthesis conditions for water-dispersible reduced graphene oxide Next Materials Controlled synthesis Tailoring microstructure Water-dispersible Reduced graphene oxide |
| title | Reductant-free synthesis conditions for water-dispersible reduced graphene oxide |
| title_full | Reductant-free synthesis conditions for water-dispersible reduced graphene oxide |
| title_fullStr | Reductant-free synthesis conditions for water-dispersible reduced graphene oxide |
| title_full_unstemmed | Reductant-free synthesis conditions for water-dispersible reduced graphene oxide |
| title_short | Reductant-free synthesis conditions for water-dispersible reduced graphene oxide |
| title_sort | reductant free synthesis conditions for water dispersible reduced graphene oxide |
| topic | Controlled synthesis Tailoring microstructure Water-dispersible Reduced graphene oxide |
| url | http://www.sciencedirect.com/science/article/pii/S2949822823000588 |
| work_keys_str_mv | AT gebremedhingebremariamgebreegziabher reductantfreesynthesisconditionsforwaterdispersiblereducedgrapheneoxide AT destagebremedhingebrehiwot reductantfreesynthesisconditionsforwaterdispersiblereducedgrapheneoxide AT eliasassayehegn reductantfreesynthesisconditionsforwaterdispersiblereducedgrapheneoxide AT gebrehiwotgebreslassie reductantfreesynthesisconditionsforwaterdispersiblereducedgrapheneoxide |