Vim li cas daim ntawv graphite thiaj li ua hluav taws xob?
Vim tias graphite muaj cov nqi txav mus los dawb, cov nqi txav mus los dawb tom qab hluav taws xob los tsim cov hluav taws xob, yog li nws tuaj yeem coj hluav taws xob. Qhov laj thawj tiag tiag vim li cas graphite coj hluav taws xob yog tias 6 cov pa roj carbon sib koom 6 electrons los tsim ib qho loj ∏66 bond nrog 6 electrons thiab 6 qhov chaw. Hauv lub nplhaib carbon ntawm tib txheej ntawm graphite, tag nrho 6-membered rings tsim ib qho ∏-∏ conjugated system. Hauv lwm lo lus, hauv lub nplhaib carbon ntawm tib txheej ntawm graphite, tag nrho cov pa roj carbon tsim ib qho loj loj ∏ bond, thiab tag nrho cov electrons hauv qhov loj ∏ bond no tuaj yeem ntws dawb hauv txheej, uas yog qhov laj thawj vim li cas daim ntawv graphite tuaj yeem coj hluav taws xob.
Graphite yog ib qho qauv lamellar, thiab muaj cov electrons dawb uas tsis sib txuas ntawm cov khaubncaws sab nraud povtseg. Tom qab hluav taws xob, lawv tuaj yeem txav mus rau qhov chaw. Yuav luag txhua yam khoom siv hluav taws xob, nws tsuas yog ib qho teeb meem ntawm kev tiv taus. Cov qauv ntawm graphite txiav txim siab tias nws muaj qhov tiv taus tsawg tshaj plaws ntawm cov ntsiab lus carbon.
Txoj cai ntawm daim ntawv graphite conductive:
Cov pa roj carbon yog ib lub atom tetravalent. Ntawm ib sab tes, ib yam li cov hlau atoms, cov electrons sab nraud tshaj plaws yooj yim ploj. Cov pa roj carbon muaj tsawg dua cov electrons sab nraud tshaj plaws. Nws zoo ib yam li cov hlau, yog li nws muaj qee qhov kev coj hluav taws xob. , cov electrons dawb thiab qhov sib xws yuav tsim. Ua ke nrog cov electrons sab nraud uas cov pa roj carbon tuaj yeem poob tau yooj yim, nyob rau hauv qhov kev ua ntawm qhov sib txawv, yuav muaj kev txav mus los thiab sau cov qhov. Tsim cov dej ntws ntawm cov electrons. Qhov no yog lub hauv paus ntsiab lus ntawm semiconductors.
Lub sijhawm tshaj tawm: Lub Peb Hlis-14-2022