The mechanism of the reaction of graphite oxide to reduced graphene oxide under ultraviolet irradiation
Under ultraviolet (UV) irradiation, the formation and reduction mechanism of reduced graphene oxide (rGO) layers prepared from graphite oxide (GO) sheets have been investigated. The effects of hydroxyl free radicals (HO), hydroxide ions (OH−) or hydrazine molecules (N2H4) are considered. It has been...
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| Veröffentlicht in: | Carbon (New York) 2013-04, Vol.54, p.412-418 |
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| creator | Ji, Tianhao Hua, Yongyong Sun, Mei Ma, Nan |
| description | Under ultraviolet (UV) irradiation, the formation and reduction mechanism of reduced graphene oxide (rGO) layers prepared from graphite oxide (GO) sheets have been investigated. The effects of hydroxyl free radicals (HO), hydroxide ions (OH−) or hydrazine molecules (N2H4) are considered. It has been demonstrated that the HO radicals, UV-induced from H2O2 molecules in aqueous solution, cannot reduce GO into rGO, but to some extent oxidize and damage the GO structure, simultaneously accompanied by a slight increase of acidity, possibly because of a release of H+ from H2O2 and GO during the reaction. The existence of OH− ions or N2H4 instead of H2O2 molecules enables GO sheets to be quickly reduced into rGO due to the effect of photo-induced electrons on the GO sheets. The electrons are photogenerated mainly from OH− or N2H4 in a GO aqueous dispersion. Because GO in diluted N2H4 aqueous solution can be photo-reduced almost completely within half an hour at room temperature, it is inferred that many more electrons are generated from N2H4 than from OH−. |
| doi_str_mv | 10.1016/j.carbon.2012.11.057 |
| format | Article |
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The effects of hydroxyl free radicals (HO), hydroxide ions (OH−) or hydrazine molecules (N2H4) are considered. It has been demonstrated that the HO radicals, UV-induced from H2O2 molecules in aqueous solution, cannot reduce GO into rGO, but to some extent oxidize and damage the GO structure, simultaneously accompanied by a slight increase of acidity, possibly because of a release of H+ from H2O2 and GO during the reaction. The existence of OH− ions or N2H4 instead of H2O2 molecules enables GO sheets to be quickly reduced into rGO due to the effect of photo-induced electrons on the GO sheets. The electrons are photogenerated mainly from OH− or N2H4 in a GO aqueous dispersion. 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The effects of hydroxyl free radicals (HO), hydroxide ions (OH−) or hydrazine molecules (N2H4) are considered. It has been demonstrated that the HO radicals, UV-induced from H2O2 molecules in aqueous solution, cannot reduce GO into rGO, but to some extent oxidize and damage the GO structure, simultaneously accompanied by a slight increase of acidity, possibly because of a release of H+ from H2O2 and GO during the reaction. The existence of OH− ions or N2H4 instead of H2O2 molecules enables GO sheets to be quickly reduced into rGO due to the effect of photo-induced electrons on the GO sheets. The electrons are photogenerated mainly from OH− or N2H4 in a GO aqueous dispersion. Because GO in diluted N2H4 aqueous solution can be photo-reduced almost completely within half an hour at room temperature, it is inferred that many more electrons are generated from N2H4 than from OH−.</description><subject>Aqueous solutions</subject><subject>Carbon</subject><subject>Chemistry</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Dispersions</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Graphene</subject><subject>Graphite</subject><subject>Irradiation</subject><subject>Materials science</subject><subject>Other materials</subject><subject>Oxides</subject><subject>Photochemistry</subject><subject>Physical chemistry of induced reactions (with radiations, particles and ultrasonics)</subject><subject>Physics</subject><subject>Specific materials</subject><subject>Ultraviolet</subject><issn>0008-6223</issn><issn>1873-3891</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqNUcFO3DAQtapW6hb6Bz3kUqmXBNtxbO8FCSFakJC4wNma2BPWq2y8tR0Ef19HoRwRJ2v83ps3M4-QH4w2jDJ5tm8sxD5MDaeMN4w1tFOfyIZp1dat3rLPZEMp1bXkvP1KvqW0L6XQTGzI4_0OqwPaHUw-HaowVLl8RASbfZiW-jHCceczVuHZO6xyKKibLboVwek_Mk8OYzWPOcKTDyPmyscIzsPS6ZR8GWBM-P31PSEPv6_uL6_r27s_N5cXt7UVUueadS3yXjkBg-x0zzVFrhWonrcSgW-ppWUh2iFyC9pJQRXrne6UA4Zl3faE_Fr7HmP4O2PK5uCTxXGECcOcDJOqeAghP0BtZcd4OeW2UMVKtTGkFHEwx-gPEF8Mo2aJwOzNGoFZIjCMmaIrsp-vDpAsjEOEyfr0puVyq4TQyyTnKw_LZZ48RpOsx6nc2Ee02bjg3zf6Bw8Wnpg</recordid><startdate>20130401</startdate><enddate>20130401</enddate><creator>Ji, Tianhao</creator><creator>Hua, Yongyong</creator><creator>Sun, Mei</creator><creator>Ma, Nan</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>JG9</scope><scope>7U5</scope><scope>L7M</scope></search><sort><creationdate>20130401</creationdate><title>The mechanism of the reaction of graphite oxide to reduced graphene oxide under ultraviolet irradiation</title><author>Ji, Tianhao ; Hua, Yongyong ; Sun, Mei ; Ma, Nan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c468t-153e2b7d4af658b280e287a7b236ea290c038905ee2ca8d64071bd857da1e8733</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Aqueous solutions</topic><topic>Carbon</topic><topic>Chemistry</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Dispersions</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Graphene</topic><topic>Graphite</topic><topic>Irradiation</topic><topic>Materials science</topic><topic>Other materials</topic><topic>Oxides</topic><topic>Photochemistry</topic><topic>Physical chemistry of induced reactions (with radiations, particles and ultrasonics)</topic><topic>Physics</topic><topic>Specific materials</topic><topic>Ultraviolet</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ji, Tianhao</creatorcontrib><creatorcontrib>Hua, Yongyong</creatorcontrib><creatorcontrib>Sun, Mei</creatorcontrib><creatorcontrib>Ma, Nan</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Carbon (New York)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ji, Tianhao</au><au>Hua, Yongyong</au><au>Sun, Mei</au><au>Ma, Nan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The mechanism of the reaction of graphite oxide to reduced graphene oxide under ultraviolet irradiation</atitle><jtitle>Carbon (New York)</jtitle><date>2013-04-01</date><risdate>2013</risdate><volume>54</volume><spage>412</spage><epage>418</epage><pages>412-418</pages><issn>0008-6223</issn><eissn>1873-3891</eissn><coden>CRBNAH</coden><abstract>Under ultraviolet (UV) irradiation, the formation and reduction mechanism of reduced graphene oxide (rGO) layers prepared from graphite oxide (GO) sheets have been investigated. The effects of hydroxyl free radicals (HO), hydroxide ions (OH−) or hydrazine molecules (N2H4) are considered. It has been demonstrated that the HO radicals, UV-induced from H2O2 molecules in aqueous solution, cannot reduce GO into rGO, but to some extent oxidize and damage the GO structure, simultaneously accompanied by a slight increase of acidity, possibly because of a release of H+ from H2O2 and GO during the reaction. The existence of OH− ions or N2H4 instead of H2O2 molecules enables GO sheets to be quickly reduced into rGO due to the effect of photo-induced electrons on the GO sheets. The electrons are photogenerated mainly from OH− or N2H4 in a GO aqueous dispersion. Because GO in diluted N2H4 aqueous solution can be photo-reduced almost completely within half an hour at room temperature, it is inferred that many more electrons are generated from N2H4 than from OH−.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.carbon.2012.11.057</doi><tpages>7</tpages></addata></record> |
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| ispartof | Carbon (New York), 2013-04, Vol.54, p.412-418 |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Aqueous solutions Carbon Chemistry Cross-disciplinary physics: materials science rheology Dispersions Exact sciences and technology General and physical chemistry Graphene Graphite Irradiation Materials science Other materials Oxides Photochemistry Physical chemistry of induced reactions (with radiations, particles and ultrasonics) Physics Specific materials Ultraviolet |
| title | The mechanism of the reaction of graphite oxide to reduced graphene oxide under ultraviolet irradiation |
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