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      您的位置:首頁 > 新聞中心 > 什么?你還停留在制備石墨烯的階段?
      新聞中心
      什么?你還停留在制備石墨烯的階段?
      2016.09.26   點擊3305次

          石墨烯是目前世界上最薄卻也是最堅硬的納米材料,它是由單層碳原子構成的蜂窩狀二維晶體,具有優異的電學、熱傳導、阻隔性等材料性能,被稱為“黑金”和“新材料之王”?茖W家曾預言“石墨烯將徹底改變21世紀”。

          雖然榮獲2010年諾貝爾獎的兩位科學家僅憑借一卷膠帶、一支鉛筆就制備出了石墨烯,但這并不代表石墨烯就能很快被大規模生產。事實上受技術所限,要大量制得質量高、缺陷少、性能優異的石墨烯絕非易事。

          當前石墨烯的制備技術主要包括:化學氣相沉積法,氧化還原法,微機械剝離法和外延生長法等。氧化還原因為操作簡單、制備成本低,產率高等優點已成為實驗室的石墨烯主流合成方法。具體操作過程為:先用強氧化劑濃硫酸、濃硝酸、高錳酸鉀等將石墨氧化成氧化石墨,氧化過程即在石墨層間穿插一些含氧官能團,從而加大了石墨層間距,然后經超聲處理一段時間之后,就可形成單層或數層氧化石墨烯,再用強還原劑水合肼、硼氫化鈉等將氧化石墨烯還原成石墨烯。

      氧化石墨烯制備流程(來源:材料+)

          氧化還原法看似簡單,要注意的地方其實有很多,比如:氧化劑的濃度要合適,反應時間要控制,各種參數要調控等。操作上也需倍加小心,且不說實驗中用到的強氧化劑腐蝕性高,在將這些強氧化劑混合時尤其要注意用量和比例,超出限制很可能引發爆炸。

          所以說,制備石墨烯的過程也算是經歷九九八十一難,才能得到理想的產物?上Ъ幢隳阋宦放,操作得當,有時候實驗還是會以失敗告終。

          Sigma-Aldrich可以提供多種形式的石墨烯和氧化石墨烯產品,有膜、有粉末、有水溶液。

      Graphene Films
       產品編號 產品描述
       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
       產品編號 產品描述
       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
       產品編號 產品描述
       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
       產品編號 產品描述
       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
       產品編號 產品描述
       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
       產品編號 產品描述
       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

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