Cov Txheej Txheem Tsim Khoom Zinc Telluride (ZnTe)

Zinc telluride (ZnTe), ib qho khoom siv semiconductor tseem ceeb II-VI, yog siv dav hauv kev tshawb nrhiav infrared, lub hnub ci hlwb, thiab cov khoom siv optoelectronic. Kev nce qib tsis ntev los no hauv nanotechnology thiab tshuaj ntsuab tau ua kom zoo dua nws cov khoom tsim tawm. Hauv qab no yog cov txheej txheem tsim khoom ZnTe tam sim no thiab cov kev ntsuas tseem ceeb, suav nrog cov txheej txheem ib txwm muaj thiab kev txhim kho niaj hnub no:
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I. Cov Txheej Txheem Tsim Khoom Ib Txwm Muaj (Kev Sib Xyaws Ncaj Qha)
1. Kev Npaj Khoom Siv Raw
• Zinc (Zn) thiab tellurium (Te) uas muaj purity siab: Purity ≥99.999% (qib 5N), sib xyaw ua ke hauv 1:1 molar ratio.
• Cov pa roj tiv thaiv: Cov argon (Ar) lossis nitrogen (N₂) uas muaj purity siab los tiv thaiv kev oxidation.
2. Cov Txheej Txheem
• Kauj Ruam 1: Kev Sib Xyaws Los Ntawm Lub Tshuab Nqus Tsev
o Sib tov Zn thiab Te hmoov rau hauv lub raj quartz thiab tshem tawm mus rau ≤10⁻³ Pa.
o Kev pab cuam cua sov: Cua sov ntawm 5–10°C/feeb mus txog 500–700°C, tuav rau 4–6 teev.
o Cov qauv tshuaj tiv thaiv: Zn + Te → ΔZnTeZn + TeΔZnTe
• Kauj Ruam 2: Kev Kub Hnyiab
o Ua kom cov khoom nyoos kub ntawm 400–500°C li 2–3 teev kom txo cov teeb meem ntawm cov lattice.
• Kauj Ruam 3: Kev Sib Tsoo thiab Kev Sib Tsoo
o Siv lub tshuab zeb pob los zom cov khoom loj kom txog thaum cov khoom me me (lub tshuab zeb pob muaj zog heev rau nanoscale).
3. Cov Qauv Tseem Ceeb
• Kev tswj qhov kub thiab txias raug: ±5°C
• Tus nqi txias: 2–5°C/feeb (kom tsis txhob muaj kev tawg ntawm kev ntxhov siab thermal)
• Qhov loj ntawm cov khoom siv raw: Zn (100–200 mesh), Te (200–300 mesh)
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II. Cov Txheej Txheem Txhim Kho Niaj Hnub (Txoj Kev Solvothermal)
Txoj kev solvothermal yog txoj kev siv tseem ceeb rau kev tsim cov nanoscale ZnTe, muab cov txiaj ntsig xws li qhov loj me ntawm cov khoom me me uas tswj tau thiab kev siv hluav taws xob tsawg.
1. Cov Khoom Siv Raw thiab Cov Tshuaj Solvents
• Cov khoom ua ntej: Zinc nitrate (Zn(NO₃)₂) thiab sodium tellurite (Na₂TeO₃) lossis hmoov tellurium (Te).
• Cov tshuaj txo cov khoom siv: Hydrazine hydrate (N₂H₄·H₂O) lossis sodium borohydride (NaBH₄).
• Cov kuab tshuaj: Ethylenediamine (EDA) lossis dej deionized (DI dej).
2. Cov Txheej Txheem
• Kauj Ruam 1: Kev Yaj Tawm Cov Khoom Ua Ntej
o Yaj Zn(NO₃)₂ thiab Na₂TeO₃ rau hauv qhov sib piv 1:1 hauv cov kuab tshuaj thaum do.
• Kauj Ruam 2: Kev Txo Qhov Kev Ua Haujlwm
o Ntxiv cov tshuaj txo (piv txwv li, N₂H₄·H₂O) thiab kaw rau hauv lub tshuab autoclave siab.
o Cov xwm txheej ntawm kev ua teb:
Kub: 180-220°C
 Lub Sijhawm: 12-24 teev
Siab: Tsim los ntawm tus kheej (3–5 MPa)
o Cov qauv tshuaj tiv thaiv: Zn2++TeO32−+Tus neeg txo qis→ZnTe+Cov khoom seem (piv txwv li, H₂O, N₂)Zn2++TeO32−+Tus neeg txo qis→ZnTe+Cov khoom seem (piv txwv li, H₂O, N₂)
• Kauj Ruam 3: Tom qab kho mob
o Siv lub tshuab centrifuge los cais cov khoom, ntxuav 3–5 zaug nrog ethanol thiab dej DI.
o Qhuav hauv lub tshuab nqus tsev (60–80°C rau 4–6 teev).
3. Cov Qauv Tseem Ceeb
• Qhov concentration ntawm cov tshuaj ua ntej: 0.1–0.5 mol/L
• Kev tswj pH: 9–11 (cov xwm txheej alkaline nyiam qhov kev ua haujlwm)
• Kev tswj qhov loj ntawm cov khoom me me: Kho kom haum los ntawm hom tshuaj yaj (piv txwv li, EDA ua rau cov nanowires; theem dej ua rau cov nanoparticles).
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III. Lwm Cov Txheej Txheem Siab Dua
1. Kev Tso Pa Tshuaj Lom Zem (CVD)
• Daim Ntawv Thov: Kev npaj zaj duab xis nyias (piv txwv li, cov hlwb hnub ci).
• Cov Khoom Ua Ntej: Diethylzinc (Zn(C₂H₅)₂) thiab diethyltellurium (Te(C₂H₅)₂).
• Cov Kev Ntsuas:
o Qhov kub ntawm qhov tso tawm: 350–450°C
o Cov pa roj thauj khoom: H₂/Ar sib tov (qhov ntws ceev: 50–100 sccm)
o Siab: 10⁻²–10⁻³ Torr
2. Kev Sib Txhuam Hlau (Kev Sib Tsoo Pob)
• Nta: Tsis muaj kuab tshuaj, tsis kub thiab tsis kub.
• Cov Kev Ntsuas:
o Qhov sib piv ntawm pob thiab hmoov: 10:1
o Lub sijhawm ua haujlwm: 20–40 teev
o Kev sib hloov ceev: 300–500 rpm
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IV. Kev Tswj Xyuas Zoo thiab Kev Txheeb Xyuas Tus Yam Ntxwv
1. Kev tshuaj xyuas qhov huv: X-ray diffraction (XRD) rau cov qauv siv lead ua (lub ncov tseem ceeb ntawm 2θ ≈25.3°).
2. Kev tswj hwm Morphology: Kev siv tshuab hluav taws xob xa mus rau lub tshuab microscopy (TEM) rau qhov loj me ntawm nanoparticle (feem ntau: 10–50 nm).
3. Qhov piv ntawm cov khoom: Kev siv hluav taws xob-dispersive X-ray spectroscopy (EDS) lossis inductively coupled plasma mass spectrometry (ICP-MS) los paub meej tias Zn ≈1:1.
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V. Kev Nyab Xeeb thiab Kev Xav Txog Ib puag ncig
1. Kev kho cov pa roj khib nyiab: Nqus H₂Te nrog cov kua alkaline (piv txwv li, NaOH).
2. Kev rov qab tau cov kuab tshuaj: Rov siv cov kuab tshuaj organic (piv txwv li, EDA) los ntawm kev sib xyaw ua ke.
3. Kev tiv thaiv: Siv cov ntaub npog qhov ncauj roj (rau kev tiv thaiv H₂Te) thiab cov hnab looj tes uas tiv taus xeb.
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VI. Cov Qauv Txuj Ci
• Kev tsim cov tshuaj ntsuab: Tsim cov txheej txheem aqueous-phase los txo kev siv cov organic solvent.
• Kev hloov kho doping: Txhim kho kev coj ua los ntawm kev doping nrog Cu, Ag, thiab lwm yam.
• Kev tsim khoom loj: Siv cov reactors uas ntws tas mus li kom ua tiav cov pawg loj kg.