Cov Khoom Thiab Kev Siv Ntawm Dawb Graphene
Mar 09, 2022
"White graphene" yog lwm lub npe rau hexagonal boron nitride (abbreviated H-BN). Hexagonal boron nitride zoo ib yam li graphite hauv cov qauv, nrog cov qauv hexagonal txheej, mos zoo nkauj, muaj zog ua haujlwm, thiab xim dawb, yog li nws feem ntau hu ua "dawb graphite" (tam sim no tseem hu ua "dawb graphene").
Ob lub hexagonal boron nitride thiab graphene yog txheej, ob sab ntawm cov ntaub ntawv tsuas yog ib qho atom tuab. Qhov txawv yog tias graphene bonds tsuas yog covalently ntawm carbon atoms, thaum lub bonds nyob rau hauv hexagonal boron nitride crystals yog covalently ntawm boron thiab nitrogen atoms.
Txawm hais tias zoo sib xws hauv cov qauv, cov khoom hluav taws xob ntawm ob lub ntiaj teb sib nrug. Hexagonal boron nitride yog lub ntuj insulator vim tias nws tsis muaj hluav taws xob txav mus los hauv nws cov txheej txheem txheej, hos graphene yog tus neeg xyuas pib zoo.
Tsis tas li ntawd, H-BN kuj muaj thermal stability, zoo thermal conductivity thiab hluav taws xob rwb thaiv tsev, broadband sib txawv (kwv yees li 5.5 eV), tshwj xeeb UV luminescence kev ua tau zoo, zoo lubrication, siab mechanical zog, tshuaj corrosion kuj, neutron absorption muaj peev xwm thiab lwm yam cuab yeej cuab tam. .