Ultrasonic txoj kev rau graphene dispersion

Cov txheej txheem tshuaj ua ntej siv cov tshuaj tiv thaiv oxidation rau oxidize graphite rau graphite oxide, thiab ua kom cov interlayer sib nrug los ntawm kev qhia cov pa oxygen - uas muaj cov pab pawg ua haujlwm ntawm cov pa roj carbon atoms ntawm cov graphite txheej, yog li ua rau tsis muaj kev cuam tshuam ntawm cov khaubncaws sab nraud povtseg.

Cov txheej txheem oxidation muaj xws li Brodie method, Staudenmaier method thiab Hummers method. Lub hauv paus ntsiab lus yog ua ntej kho graphite nrog cov kua qaub muaj zog thiab tom qab ntawd ntxiv cov oxidant muaj zog rau oxidation. Lub oxidized graphite yog exfoliated los ntawm ultrasonic los tsim graphene oxide, thiab tom qab ntawd tus neeg sawv cev txo tau ntxiv rau kev txo qis, yog li tau txais graphene.

Feem ntau siv cov tshuaj txo qis yog hydrazine hydrate, NaBH4 thiab muaj zog alkali ultrasonic txo. Vim tias NaBH4 kim thiab yooj yim khaws B lub ntsiab lus, txawm hais tias kev ua haujlwm ntawm alkali ultrasonic txo qis yog qhov yooj yim thiab tus phooj ywg ib puag ncig, nws yog qhov nyuaj kom txo tau tag nrho, thiab feem ntau muaj ntau cov pa oxygen - uas muaj cov pab pawg ua haujlwm sab laug tom qab txo. Yog li ntawd, pheej yig hydrazine hydrate feem ntau yog siv los txo graphite oxide. . Qhov zoo ntawm hydrazine hydrate txo qis yog tias qhov txo qis muaj peev xwm muaj zog thiab hydrazine hydrate yooj yim rau volatilize, thiab tsis muaj impurities nyob hauv cov khoom. Hauv cov txheej txheem txo qis, qhov tsim nyog ntawm cov dej ammonia feem ntau yog ntxiv los txhim kho qhov txo qis ntawm hydrazine hydrate ntawm ib sab, thiab graphite ntawm qhov tod tes. Qhov chaw ntawm graphene cuam tshuam ib leeg vim qhov tsis zoo, uas ua rau txo cov agglomeration ntawm graphene.

Graphene tuaj yeem npaj tau ntau los ntawm cov tshuaj redox txoj kev, thiab cov khoom nruab nrab ntawm graphene oxide muaj qhov zoo dispersibility hauv dej thiab yooj yim kom qhuav kom ua tiav kev hloov kho thiab kev ua haujlwm ntawm graphene. Yog li ntawd, txoj kev no feem ntau yog siv rau cov khoom sib xyaw qhuav. Lub zog cia thiab lwm yam kev tshawb fawb. Txawm li cas los xij, vim tias tsis muaj qee cov pa roj carbon atom nyob rau hauv cov txheej txheem ntawm oxidative ultrasonication thiab cov seem ntawm dab tshos - uas muaj cov pab pawg ua haujlwm hauv cov txheej txheem txo qis, cov pob zeb uas npaj tau feem ntau muaj ntau lub tswb nrov, uas txo nws cov conductivity, uas txwv tsis pub muaj kev cuam tshuam rau cov khoom siv. zoo graphene. Cov ntawv thov hauv cov teb xav tau