以CaCl2作为催化剂、NaBH4为还原剂,还原氧化石墨烯。还原反应能在室温下进行,并以去离子水作为唯一的溶剂,此法是一种低能耗、环保并简易的方法。通过红外光谱、紫外光谱、X射线光电子能谱、表面电阻测量手段研究CaCl2添加量对氧化石墨烯还原程度的影响。采用透射电子显微镜和原子力显微镜观察氧化石墨烯和还原氧化石墨烯的形貌。结果表明,以氯化钙作为催化剂还原氧化石墨烯,能更有效地去除氧化石墨烯表面的含氧官能团,提高还原氧化石墨烯的导电性。当CaCl2添加浓度达到50 mmol/L时,还原氧化石墨烯C/O比达到5.38,表面电阻达到18.6 kΩ/sq。
Graphene oxide ( GO) prepared by a modified Hummers method was reduced by NaBH4 at room temperature for 12 h in a 0. 5 mg/mL GO water suspension to obtain reduced GO (RGO), using CaCl2 as a catalyst. The GO and RGO were character_ized by XPS, FT_IR, UV_Vis and electrical resistivity measurements. Results show that CaCl2 improves the reduction ability of NaBH4 for oxygen_containing functional groups on the GO. After reduction, the C/O atomic ratio increased, most of the oxygen_containing functional groups were eliminated, and the electrical resistance decreased significantly. The highest C/O atomic ratio was 5. 38 and the lowest electrical resistance of RGO was 18. 6 kΩ/sq, the latter being about two orders of magnitudes lower than the RGO prepared without CaCl2 . This reduction method opens a possibility of reducing GO under ambient conditions without using a toxic/corrosive reducing agent and an organic solvent.
参考文献
| [1] | Geim AK;Novoselov KS .The rise of graphene[J].Nature materials,2007(3):183-191. |
| [2] | C. N. R. Rao;Kanishka Biswas;K. S. Subrahmanyam .Graphene, the new nanocarbon[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2009(17):2457-2469. |
| [3] | Soldano C;Mahmood A;Dujardin E et al.Production,proper_ties and potential of grapheme[J].CARBON,2010,48(8):2127_2150. |
| [4] | He HY.;Forster M.;Lerf A.;Klinowski J. .A new structural model for graphite oxide[J].Chemical Physics Letters,1998(1/2):53-56. |
| [5] | Songfeng Pei;Hui-Ming Cheng .The reduction of graphene oxide[J].Carbon: An International Journal Sponsored by the American Carbon Society,2012(9):3210-3228. |
| [6] | Moon K;Lee J;Ruoffand S R et al.Reduced graphene oxide by chemical graphitization[J].Nature Communications,2010,1:73_78. |
| [7] | Sasha Stankovich;Dmitriy A. Dikin;Richard D. Piner .Synthesis of graphene-based nanosheets via chemical reduction of exfoliated graphite oxide[J].Carbon: An International Journal Sponsored by the American Carbon Society,2007(7):1558-1565. |
| [8] | Zhuangjun Fan;Kai Wang;Iong Wei .An environmentally friendly and efficient route for the reduction of graphene oxide by aluminum powder[J].Carbon: An International Journal Sponsored by the American Carbon Society,2010(5):1686-1689. |
| [9] | M. J. Fernandez-Merino;L. Guardia;J. I. Paredes .Vitamin C Is an Ideal Substitute for Hydrazine in the Reduction of Graphene Oxide Suspensions[J].The journal of physical chemistry, C. Nanomaterials and interfaces,2010(14):6426-6432. |
| [10] | Hyeon-Jin Shin;Ki Kang Kim;Anass Benayad;Seon-Mi Yoon;Hyeon Ki Park;In-Sun Jung;Mei Hua Jin;Hae-Kyung Jeong;Jong Min Kim;Jae-Young Choi;Young Hee Lee .Efficient Reduction of Graphite Oxide by Sodium Borohydride and Its Effect on Electrical Conductance[J].Advanced functional materials,2009(12):1949-1961. |
| [11] | Periasamy M.;Thirumalaikumar P. .Methods of enhancement of reactivity and selectivity of sodium borohydride for applications in organic synthesis [Review][J].Journal of Organometallic Chemistry,2000(1/2):137-151. |
| [12] | Junfeng Li;Hong Lin;Zhilong Yang .A method for the catalytic reduction of graphene oxide at temperatures below 150 ℃[J].Carbon: An International Journal Sponsored by the American Carbon Society,2011(9):3024-3030. |
| [13] | Zheng, Q.;Ip, W.H.;Lin, X.;Yousefi, N.;Yeung, K.K.;Li, Z.;Kim, J.-K. .Transparent conductive films consisting of ultralarge graphene sheets produced by Langmuir-Blodgett assembly[J].ACS nano,2011(7):6039-6051. |
| [14] | Schniepp H C;Li J L;McAllister M J et al.Functionalized single graphene sheets derived from splitting graphite oxide[J].Journal of Chemical Physics,2006,110(17):8535_8539. |
| [15] | Akbar Bagri;Cecilia Mattevi;Muge Acik .Structural evolution during the reduction of chemically derived graphene oxide[J].Nature Chemistry,2010(7):581-587. |
| [16] | Mkhoyan, KA;Contryman, AW;Silcox, J;Stewart, DA;Eda, G;Mattevi, C;Miller, S;Chhowalla, M .Atomic and Electronic Structure of Graphene-Oxide[J].Nano letters,2009(3):1058-1063. |
| [17] | Wei Gao;Lawrence B. Alemany;Lijie Ci .New insights into the structure and reduction of graphite oxide[J].Nature Chemistry,2009(5):403-408. |
| [18] | Kris Erickson;Rolf Erni;Zonghoon Lee;Nasim Alem;Will Gannett;Alex Zettl .Determination of the Local Chemical Structure of Graphene Oxide and Reduced Graphene Oxide[J].Advanced Materials,2010(40):4467-4472. |
| [19] | Liu, KP;Zhang, JJ;Yang, GH;Wang, CM;Zhu, JJ .Direct electrochemistry and electrocatalysis of hemoglobin based on poly(diallyldimethylammonium chloride) functionalized graphene sheets/room temperature ionic liquid composite film[J].Electrochemistry communications,2010(3):402-405. |
| [20] | Marcano DC;Kosynkin DV;Berlin JM;Sinitskii A;Sun ZZ;Slesarev A;Alemany LB;Lu W;Tour JM .Improved Synthesis of Graphene Oxide[J].ACS nano,2010(8):4806-4814. |
| [21] | Songfeng Pei;Jinping Zhao;Jinhong Du .Direct reduction of graphene oxide films into highly conductive and flexible graphene films by hydrohalic acids[J].Carbon: An International Journal Sponsored by the American Carbon Society,2010(15):4466-4474. |
| [22] | Robert C;Wade R C .Catalyzed reduction of organofunctional groups with sodium borohydride[J].Journal of Molecular Ca_talysis,1983,18(3):273_297. |
| [23] | Yasumitsu Suzuki;Daisuke Kaneno;Shuji Tomoda .Theoretical Study on the Mechanism and Diastereoselectivity of NaBH4 Reduction[J].The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory,2009(11):2578-2583. |
| [24] | Jing Li;Zhenzhen Yang;Hanxun Qiu .Microwave-assisted simultaneous reduction and titanate treatment of graphene oxide[J].Journal of Materials Chemistry, A. Materials for energy and sustainability,2013(37):11451-11455. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%