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什么?你还停留在制备石墨烯的阶段?
2016.09.26 点击7374次
石墨烯是目前世界上最薄却也是最坚硬的纳米材料,它是由单层碳原子构成的蜂窝状二维晶体,具有优异的电学、热传导、阻隔性等材料性能,被称为“黑金”和“新材料之王”。科学家曾预言“石墨烯将彻底改变21世纪”。
虽然荣获2010年诺贝尔奖的两位科学家仅凭借一卷胶带、一支铅笔就制备出了石墨烯,但这并不代表石墨烯就能很快被大规模生产。事实上受技术所限,要大量制得质量高、缺陷少、性能优异的石墨烯绝非易事。
当前石墨烯的制备技术主要包括:化学气相沉积法,氧化还原法,微机械剥离法和外延生长法等。氧化还原因为操作简单、制备成本低,产率高等优点已成为实验室的石墨烯主流合成方法。具体操作过程为:先用强氧化剂浓硫酸、浓硝酸、高锰酸钾等将石墨氧化成氧化石墨,氧化过程即在石墨层间穿插一些含氧官能团,从而加大了石墨层间距,然后经超声处理一段时间之后,就可形成单层或数层氧化石墨烯,再用强还原剂水合肼、硼氢化钠等将氧化石墨烯还原成石墨烯。
氧化石墨烯制备流程(来源:材料+) |
氧化还原法看似简单,要注意的地方其实有很多,比如:氧化剂的浓度要合适,反应时间要控制,各种参数要调控等。操作上也需倍加小心,且不说实验中用到的强氧化剂腐蚀性高,在将这些强氧化剂混合时尤其要注意用量和比例,超出限制很可能引发爆炸。
所以说,制备石墨烯的过程也算是经历九九八十一难,才能得到理想的产物。可惜即便你一路努力,操作得当,有时候实验还是会以失败告终。
Sigma-Aldrich可以提供多种形式的石墨烯和氧化石墨烯产品,有膜、有粉末、有水溶液。
Graphene Films | |
产品编号 | 产品描述 |
3092685 | Graphene field effect transistor chip |
3092695 | Graphene nanoribbons alkyl functionalized |
3092696 | Graphene nanoribbons |
3154816 | Monolayer graphene film, 1 cm x 1 cm on copper foil |
3154817 | Monolayer graphene film, 1 cm x 1 cm on quartz |
3154818 | Monolayer graphene film, 1 cm x 1 cm on SiO2/Si substrate |
3154819 | Monolayer graphene film, 1 in x 1 in on copper foil |
3154820 | Monolayer graphene film, 1 in. x 1 in. on PET film |
3154821 | Monolayer graphene film, 2 in. x 2 in. on PET film |
3246098 | Suspended monolayer graphene on TEM grid substrate (Quantifoil gold) |
Graphene Ink | |
产品编号 | 产品描述 |
3092681 | Graphene dispersion with ethyl cellulose in cyclohexanone and terpineol, inkjet printable |
3092682 | Graphene dispersion 10 mg/mL, dispersion in NMP |
3092683 | Graphene dispersion with ethyl cellulose in terpineol, gravure printable |
3092684 | Graphene dispersion with ethyl cellulose in terpineol, screen printable |
3092686 | Graphene ink in water flexo/gravure/screen printable |
3092687 | Graphene ink in water Inkjet printable |
3092688 | Graphene ink in water screen printable |
3300565 | 3D Printing Graphene Ink |
Graphene Oxide | |
产品编号 | 产品描述 |
3092697 | Graphene oxide 2 mg/mL, dispersion in H2O |
3092698 | Graphene oxide sheets |
3092699 | Graphene oxide 4 mg/mL, dispersion in H2O |
3092700 | Graphene oxide 15-20 sheets, 4-10% edge-oxidized, 1 mg/mL, dispersion in H2O |
3092701 | Graphene oxide powder, 15-20 sheets, 4-10% edge-oxidized |
3092703 | Graphene oxide, alkylamine functionalized 2.0 mg/mL, dispersion (in toluene) |
3092704 | Graphene oxide, ammonia functionalized 1 mg/mL, dispersion in H2O |
3092702 | Graphene oxide nanocolloids 2 mg/mL, dispersion in H2O |
Graphene Powder and Dispersion | |
产品编号 | 产品描述 |
3092689 | Graphene nanoplatelets powder |
3092690 | Graphene nanoplatelets 1 mg/mL, dispersion in H2O |
3092691 | Graphene nanoplatelets powder, polycarboxylate functionalized, hydrophilic |
3092692 | Graphene nanoplatelets powder, hydrocarbon functionalized, hydrophobic |
3092693 | Graphene nanoplatelets powder, oxidized |
3092694 | Graphene nanoplatelets powder, hydrophobic |
Nanocomposites | |
产品编号 | 产品描述 |
3086884 | Fe3O4/graphene nanocomposite 10 mg/mL, dispersion in acetone |
3086885 | Fe3O4/reduced graphene oxide nanocomposite 10 mg/mL, dispersion in acetone |
3139211 | Mn3O4/graphene nanocomposite 10 mg/mL, dispersion in acetone |
3139212 | Mn3O4/reduced graphene oxide nanocomposite 10 mg/mL, dispersion in acetone |
3179595 | Pd/graphene nanocomposite 10 mg/mL, dispersion in acetone |
3179596 | Pd/reduced graphene oxide nanocomposite 10 mg/mL, dispersion in acetone |
3210716 | PtCo/graphene nanocomposite 10 mg/mL, dispersion in acetone |
3210717 | PtCo/reduced graphene oxide nanocomposite 10 mg/mL, dispersion in acetone |
3210891 | PtPd/graphene nanocomposite 10 mg/mL, dispersion in acetone |
3210892 | PtPd/reduced graphene oxide nanocomposite 10 mg/mL, dispersion in acetone |
3210691 | Pt/reduced graphene oxide nanocomposite 10 mg/mL, dispersion in acetone |
3252749 | TiO2/graphene nanocomposite 10 mg/mL, dispersion (in acetone) |
Reduced Graphene Oxide | |
产品编号 | 产品描述 |
3214706 | Reduced graphene oxide |
3214707 | Reduced graphene oxide |
3214708 | Reduced graphene oxide amine functionalized |
3214709 | Reduced graphene oxide octadecylamine functionalized |
3214710 | Reduced graphene oxide tetraethylene pentamine functionalized |
3214711 | Reduced graphene oxide piperazine functionalized |