Ke joang pampiri e tšesaane ea oxide graphite le graphene e lokisoang le sebopeho

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - Umhlinzeki Wesiteshi Samandla Esiphathekayo

Lera le tšesaane le kang la oxidized graphite layer le ile la lokisoa ka katleho ka mokhoa oa Hummers o fetotsoeng, &39;me lesela le lokisitsoeng le kang la oxidation graphite le ile la fokotsoa e le graphene nanomaterial e nang le hydrazine. Lihlahisoa tsa Synthesis ka Fourier fetola infrared spectroscopy (FT-IR), Raman Spectroscopy (RS), X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmitting Electroractor (TEM), le Agency (AFM), joalo-joalo. Sebopeho le ts&39;ebetso li khetholloa.

Liphetho li bontša hore botenya ba graphene ke 0.36 nm, palo ea lihlopha ke 3. Ho phaella moo, mokhoa oa ho itšoara ka mokhoa o fetotsoeng oa Hummers o ne o lokiselitsoe ke mokhoa oa ho itšoara oa pampiri e tšesaane e kang ea oxidation graphite, &39;me mokhoa oa lik&39;hemik&39;hale oa lik&39;hemik&39;hale o hlahang nakong ea oxidation ea graphite oxidation e ile ea hlahlojoa.

Ka 2004, GEIM et al, e ile ea lokisa kristale-graphene e ncha ea mahlakore a mabeli e entsoeng ka likarolo tsa carbon athomo ea SP2 e sebelisang mokhoa oa ho hlobolisa ka mochine. Karolo ea mantlha ea sebopeho sa graphene ke lesale la benzene six yuan, e leng 0.34 nm feela.

Ka hona, graphene e na le lintho tse ngata tse babatsehang tsa lik&39;hemik&39;hale tsa &39;mele, tse kang makhetlo a 100 matla a tšepe, ho fihlela ho 130gPa, motsamao oa mochine o fihla ho 15000 cm2 / (v · s), mocheso oa mocheso ke 5000W / (m · K ). Ntle le moo, graphene e boetse e na le thepa e ikhethang joalo ka mocheso oa kamore quantum Hall effect le thepa ea mocheso oa kamore ea ferromagnetic. Hajoale, mokhoa oa ho itokisa oa graphene ke haholo-holo mokhoa oa ho hlobolisa oa micro-mechanical, deposition ea mouoane oa lik&39;hemik&39;hale, mokhoa oa ho fokotsa redox ea lik&39;hemik&39;hale, mokhoa oa ho hōla oa crystal epitaxial le mokhoa oa mocheso oa solvent.

Har&39;a bona, mokhoa oa ho hlobolisa oa micromechanical o ka lokisa graphene ea boholo ba micron, empa ho laola ho tlaase, ho thata ho finyella tlhahiso e kholo. Mokhoa oa ho hōla ha kristale epitaxial o tloaetse ho tsosolosoa ka lebaka la holim&39;a kristale ea SiC, e le hore sebaka se seholo, botenya bo lekana le graphene e le &39;ngoe. Mokhoa oa ho beha mouoane oa lik&39;hemik&39;hale (CVD) ke substrate e nang le kristale e le &39;ngoe ea tšepe kapa filimi ea tšepe, e ka hōlang lesela le lesesaane la graphene la sheet, empa bohloeki ba graphene ha bo phahame,&39; me tlhahiso e kholo e ke ke ea finyelloa.

Mokhoa oa mocheso oa solvent o bakoa ke maemo a thata a kang mocheso o phahameng le khatello e phahameng, &39;me conductivity ea lihlahisoa e tlaase,&39; me ha ho na monyetla oa ho hlahisa boima. Mokhoa oa ho fokotsa redox ea lik&39;hemik&39;hale ke ho lokisa graphene ka mokhoa oa ho hlobolisa le oa ho fokotsa ka mokhoa oa Hummers. Ka lebaka la potoloho e khuts&39;oane ea tlhahiso ea mokhoa ona, melemo ea tlhahiso e phahameng ea maiketsetso e ameha haholo le lithuto.

Nakong ea mokhoa oa Hummers, graphite e lokiselitsoe, ho kenyelletsa mocheso o tlase (0 ° C), mocheso o bohareng (38 ° C) le mocheso o phahameng (98 ° C), &39;me moemeli oa oxidizing o tsepamisitsoe H2SO4 le KMNO4. Ka thuto ea ts&39;ebetso ea graphite oxidation, mokhoa oa Hummers o fetotsoe, ke hore, nako eo sethala sa karabelo ea mocheso o mahareng se atolositsoeng, mme sethala sa karabelo e phahameng ea mocheso se hlakotsoe. Ho hlakola ts&39;ebetso ea boemo ba mocheso o phahameng, eseng feela ho qoba likotsi tsa ho phatloha ho bakoang ke sulfuric acid nakong ea karabelo e phahameng ea mocheso, empa hape ho qoba karabelo ea ho bola ha mocheso sethaleng se phahameng sa mocheso, ho fokotsa tekanyo ea oxidation ea graphite.

Ka khopolo le teko, lera la oxide e layered le ka lokisoa tlas&39;a mocheso o tlaase le maemo a sireletsehileng le a tsitsitseng. Graphite e itokisang e ile ea fokotsoa ke hydrate hydrate ho lokisa graphene nanomaterials, &39;me ho ile ha hlahisoa pampiri e tšesaane e kang oxide graphite le graphene material. 1, teko ea 1.

1, graphite ea lisebelisoa tse tala (granularity: 325 mesh, nanotechnology ea pele e ruileng ea nanotechnology Co., Ltd.); asiti ea sulfuric e tiileng (95% ~ 98%); potasiamo permanganate, sodium nitrate, hydrogenated (30%), hydrochloric acid, chlorination Barium, hydrate (80%), joalo-joalo.

li hlahlojoa. Lithethefatsi tse ka holimo ha lia boleloa ka ho khetheha, &39;me li rekoa ho Shanghai Chemical Reagent Company ea China Pharmaceutical Group. Li-reagents tsohle tse ka holimo ha li tšoaroe ka ho toba.

1.2, mohlala oa ho lokisetsa 1) Pampiri e tšesaane e kang oxide enke (GO) ho lokisoa ha lesela la 230 mL (98%) e kentsoeng sulfuric acid ka 1000 ml ea li-flask tse tharo, tlas&39;a matla a khoheli a sa khaotseng a mocheso le metsi a leqhoa, 5.0 gnano3 le 10.

0 g Metsoako ea graphite, e tsosang takatso ka lebelo le lekaneng bakeng sa metsotso e 30, e le hore e kopane. 30GKMNO4 butle-butle e kenyelelitsoe motsoako, &39;me e susumetsa ka 0 ° C bakeng sa 2 h. Li-flasks tse tharo li ile tsa fetisetsoa ka bateng ea metsi ea mocheso e sa khaotseng e neng e fetotsoe mocheso oa hoo e ka bang 38 ° C, ea tsoela pele ka lihora tse 30, &39;me mocheso o mahareng oa etsoa.

Kamora mocheso oa karabelo ea mocheso o mahareng, motsoako o fetisetsoa ka bekeng ea 2000 ml, e hlapolotsoeng ka metsi a deionized ho 1000 mL, mme 200 ml (5%) H2O2 ea eketsoa, ​​&39;me mokelikeli oa karabelo o fetoha&39; mala oa khauta. The centrifugation e ne e etsoa ka centrifuge e lebelo le phahameng, &39;me lebelo la ho potoloha e ne e le 4000 r / min, e hlatsoitsoe ka HCl e entsoeng pele ho 5% le metsi a deionized ho fihlela sulfuric acid sulfuric acid e filtrate e fumanoa,&39; me ho emisoa ho ne ho lelekoa ka har&39;a mouoane, ho phalla ha metsi, ho phalla ha mouoane. graphite e nang le oxidized. 2) Phokotso ea graphene e ile ea qhalakanngoa ka 100 ml ea enke ea graphite e hlahisoang ka 100 ml ea tharollo e nang le metsi ho fumana ho emisoa ha sootho-mosehla, &39;me maemo a ultrasound a ne a qhalakanngoa tlas&39;a botlolo ea melomo e meraro, e futhumetse ho 90 ° C, rotha 2 ml ea hydrated hydrated, ka mor&39;a hore ho hlatsuoa ka makhetlo a mangata, ka mor&39;a hore ho hlatsuoa ka makhetlo a mangata. ka methanol le metsi, &39;me graphene e omisitsoe ho feta 60 ° C.

1.3, tlhahlobo le sebopeho sa XRD diffraction analysis sebelisa Japanese Rigaku D / MAX-RB diffractometer (Cu target, Kα radiation, λ = 0.154056 nm), ho hlahloba mefuta e mengata ea 5 ° ~ 80 °; Tlhahlobo ea infrared spectroscopy (FT-IR) ThermonicoLET&39;s NEXUS Fourier fetola mabone a infrared, matlapa a KBR, bolelele ba maqhubu a 400 ~ 4000cm-1; Raman spectroscopy (Raman) e hlahloba INVIA-mofuta oa microclassless laser Raman spectrometer ea British Renishaw, Lebelo la rekoto le tsoa ho 100 ho isa ho 3200 cm-1, laser wavelength ke 785 nm, qeto ea sebaka ke 1 μm lateral direction, longitudinal ho 1 μm; ho hlahloba microscope ea elektronike (SEM) ho amohela microscope ea elektronike ea S-4800 FESEM; transmissive electron microscope (TEM) e amohela Japane k&39;hamphani ea JEO ea mofuta oa JEM-2100F-mofuta o fetisang microscope ea phetisetso e phahameng ea qeto; Atomic force scanning microscope (AFM) e sebelisa microscope ea mofuta oa US Veeco ea Nanoscope4 ea mofuta oa atomic force.

Qetello a. Ka ho hlahloba ts&39;ebetso ea oxidation ea ts&39;ebetso ea graphite oxidation, mokhoa o fetotsoeng oa Hummers oo sethaleng sa mocheso o phahameng o ileng oa hlakoloa, &39;me graphene e ile ea fumanoa ka ultrasound peeling le phekolo ea ho fokotsa hydrated hydrated. B.

Liphetho tsa liteko tsa TEM le AFM li bonts&39;a hore botenya ba graphene ke 0.36 nm, palo ea likarolo ke 3. c.

Mokhoa ona o bolokehile ebile o bonolo, tlhahiso e kholo, e bonolo ho e laola, e fana ka tokisetso e potlakileng le e bonolo, e kholo ea graphene e tšesaane e entsoeng ka pampiri, e fana ka motheo oa tšebeliso ea khoebo ea graphene. .