Ib txoj cai-Tuag, muaj yeeb yuj Silicone uas tuaj yeem ua hluav taws xob

Ib qho kev tshawb pom tshiab silicone variant yog semiconductor, University of Michigan cov kws tshawb fawb tau tshawb pom -upending kev xav tias cov khoom siv hauv chav kawm tshwj xeeb yog insulating.

Richard Laine, U-M tus xibfwb ntawm cov ntaub ntawv science thiab engineering thiab macromolecular science thiab engineering thiab tus kws sau ntawv ntawm txoj kev tshawb fawb tsis ntev los no tau tshaj tawm hauv Macromolecular Rapid Communications.

Silicone roj thiab roj hmab -polysiloxanes thiab silsesquioxanes- yog cov khoom siv insulating ib txwm muaj, txhais tau tias lawv tiv taus cov hluav taws xob los yog cua sov. Lawv cov dej-cov khoom tiv thaiv ua rau lawv muaj txiaj ntsig zoo hauv cov khoom siv tshuaj biomedical, sealants, hluav taws xob txheej thiab lwm yam.

Lub caij no, cov pa semiconductors feem ntau nruj. Semiconducting silicone muaj peev xwm ua kom cov khoom siv hluav taws xob hloov tau yooj yim Laine tau piav qhia nrog rau silicone uas tuaj yeem ua ntau yam xim.

Nyob rau theem molecular, silicones yog tsim los ntawm ib tug txha nraub qaum ntawm alternating silicon thiab oxygen atoms (Si-O-Si) nrog organic (carbon-}raws li) pawg txuas nrog silicon. Ntau yam 3D formations ntawm polymer chains tshwm sim thaum lawv txuas rau ib leeg, hu ua cross-txuas, uas hloov cov khoom siv lub cev zoo li lub zog lossis solubility.

Thaum kawm txawv tus ntoo khaub lig- txuas cov qauv hauv silicone, pab pawg tshawb fawb tau ua rau muaj peev xwm ua tau hluav taws xob hauv cov copolymer, uas yog cov saw hlau polymer uas muaj ob hom kev rov ua dua tshiab - tawb- cov qauv thiab tom qab ntawd cov kab hluav taws xob hauv qhov no.

Qhov muaj peev xwm ua tau tshwm sim los ntawm txoj kev electrons tuaj yeem txav mus thoob Si-O-Si daim ntawv cog lus nrog sib tshooj orbitals. Semiconductors muaj ob lub xeev tseem ceeb: lub xeev hauv av, uas tsis muaj hluav taws xob, thiab lub xeev ua, uas ua. Lub xeev kev coj ua, tseem hu ua lub xeev zoo siab, tshwm sim thaum qee cov electrons dhia mus rau tom ntej electron orbital, uas txuas nrog hla cov khoom zoo li hlau.

Feem ntau, Si-O-Si daim ntawv cog lus cov ces kaum tsis tso cai rau qhov kev sib txuas. Ntawm 110 degree, lawv yog txoj kev ntev ntawm 180℃ncaj kab. Tab sis nyob rau hauv silicone copolymer pab neeg nrhiav pom, cov nyiaj no pib tawm ntawm 140℃hauv av hauv xeev- thiab lawv ncav cuag 150℃hauv lub xeev zoo siab. Qhov no tau txaus los tsim txoj kev loj rau hluav taws xob kom ntws.

Laine tau hais tias "Qhov no tso cai rau kev sib cuam tshuam ntawm cov khoom siv hluav taws xob tsis xav txog thoob plaws ntau daim ntawv cog lus suav nrog Si-O-Si daim ntawv cog lus hauv cov copolymers," Laine tau hais. "Qhov ntev ntawm cov saw hlau ntev, nws yooj yim dua rau cov hluav taws xob mus rau qhov deb, txo lub zog uas xav tau los nqus lub teeb thiab tom qab ntawd emit nws ntawm qis zog."

Lub semiconducting zog ntawm silicone copolymer kuj pab kom nws spectrum ntawm cov xim. Electrons dhia hauv av thiab zoo siab lub xeev los ntawm absorbing thiab emitting photons, los yog hais txog lub teeb. Lub teeb emission nyob ntawm qhov ntev ntawm cov saw hlau copolymer, uas Laine pab neeg tuaj yeem tswj tau. Cov hlua ntev ntev txhais tau hais tias me me dhia thiab qis zog photons, muab cov silicone rau xim liab. Cov saw luv luv yuav tsum tau dhia loj dua los ntawm cov hluav taws xob, yog li lawv tawm lub teeb lub zog siab dua mus rau qhov kawg xiav ntawm lub spectrum.

Txhawm rau ua kom pom kev sib txuas ntawm cov saw ntev thiab lub teeb nqus thiab emission, cov kws tshawb fawb tau cais cov copolymers nrog cov saw ntev sib txawv thiab npaj lawv rau hauv cov raj ntsuas los ntawm ntev mus rau luv. Ci ntsa iab UV teeb ntawm cov hlab ntsha tsim ib zaj sawv tag nrho raws li txhua tus absorbs thiab emits lub teeb ntawm lub zog sib txawv.

Cov yeeb yuj array raws li copolymer saw ntev yog tshwj xeeb tshaj yog vim hais tias mus txog rau lub point no, silicones tsuas tau paub tias yog pob tshab los yog dawb vim hais tias lawv insulating zog ua rau lawv tsis muaj peev xwm nqus tau ntau lub teeb.

Zijing (Jackie) Zhang, U-M tus kws kho mob cov tub ntxhais kawm ntawm cov ntaub ntawv tshawb fawb thiab engineering thiab tus thawj coj ntawm txoj kev tshawb fawb tau hais tias "Peb tab tom noj cov khoom uas txhua tus xav tias yog hluav taws xob tsis zoo thiab muab lub neej tshiab rau nws-ib qho uas tuaj yeem ua lub zog rau tiam tom ntej ntawm cov khoom siv hluav taws xob, hloov tau yooj yim,"