( 1. 湖南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410082;
2. 湖南大學(xué) 化學(xué)化工學(xué)院， 長(zhǎng)沙 410082)
摘 要: 對(duì)氧化石墨進(jìn)行了熱解和H2還原處理， 通過(guò)元素分析、 X射線衍射分析、 傅立葉變換紅外光譜儀（FT-IR）分析和粉末電阻率測(cè)定，初步探討了氧化石墨的分子組成、 官能團(tuán)、 晶體結(jié)構(gòu)和電導(dǎo)率隨還原溫度的變化規(guī)律。 結(jié)果表明： 對(duì)經(jīng)220 ℃熱處理的熱解氧化石墨進(jìn)行H2還原處理時(shí)， 隨著還原溫度的升高， 還原氧化石墨中氧元素的質(zhì)量百分含量減小， 晶體結(jié)構(gòu)逐漸回復(fù)為石墨的晶體結(jié)構(gòu)，但存在明顯的晶粒細(xì)化現(xiàn)象； 隨溫度的升高， 還原氧化石墨的電導(dǎo)率增大， 并在500 ℃時(shí)達(dá)到最大值6.67 S/cm； 當(dāng)還原溫度超過(guò)500 ℃時(shí)，由于層間距增大及晶粒進(jìn)一步細(xì)化， 其電導(dǎo)率又逐漸降低； 熱解氧化石墨在H2中的還原過(guò)程可以分為兩個(gè)階段，第Ⅰ階段主要發(fā)生—C[FY=]O基團(tuán)和C—OH基團(tuán)的還原反應(yīng)， 第Ⅱ階段殘余的C—OH基團(tuán)被還原。
關(guān)鍵字: 氧化石墨； 還原； 晶體結(jié)構(gòu)； 電導(dǎo)率
graphite oxide in process of reduction under H2
（ 1. School of Materials Science and Engineering,
Hunan University, Changsha 410082, China;
2. School of Chemistry and Chemical Engineering,
Hunan University, Changsha 410082, China）
Abstract: Reduced graphite oxide at different temperatures was synthesized from graphite oxide by high temperature treatment and reduction under H2. Composition, functional group, crystal structure and conductivities of reduced graphite oxide at different temperatures were investigated by elemental analysis, XRD, FT-IR and automatic multi-function resistivity measuring instrument. The results show that with the increasing of temperature oxygen content of pyrolytic graphite oxide at 220 ℃(PGO220) decreases. Although the grain is refined, the crystal structure is similar with that of graphite. The conductivity of reduction graphite oxide increases with the increasing temperature and at 500 ℃ it reaches the maximum, 6.67 S/cm. when above 500 ℃ its conductivity decreases because of excursions and grain refining.There are two stages in the process of GO reduction. During the first stage —C[FY=]O and C—OH are reduced, then the residual C—OH is reduced during the second stage.
Key words: graphite oxide; reduce; crystal structure; conductivity
