Se Katkılı $Bİ_2Te_3$ Nanokristal Materyallerin Sentezi ve Karakterizasyonu

Bu çalışmada, basit bir kimyasal yol kullanılarak gerçekleştirilen selenyum (Se) katkılı bizmut tellürür $Bİ_2Te_3$ nanokristalin malzeme sentezi sunulmuştur. Bizmut (III) nitrat pentahidrat Bi $Bİleft(NO_3right).5H_2O$, tellürür dioksit $TeO_2$ ve Se tozu nitrik asit $HNO_3$ ile çözülmüştür. Burada, sodyum hidroksit NaOH ve sodyum borohidrid $NaBH_4$ kullanılarak iki aşamalı birlikte çökeltme kimyasal yolu denenmiştir. Bunun sonucunda, geliştirilen $Bi_2Te_{24}Se_{0.6}$ nanokristalin tozları ve peletlerinin ölçümleri için X-ışını kırınımı (XRD), taramalı elektron mikroskopisi (SEM), enerji dağılımlı X-ışını (EDX), transvers elektron mikroskobu (TEM), atomik kuvvet mikroskobu (AFM), ultraviyole absorbansı (UV) ve Fourier dönüşümü kızılötesi spektrometresi (FT-IR) cihazları kullanılmıştır. Elde edilen ölçüm sonuçlarına göre nano boyutlarda $Bi_2Te_{24}Se_{0.6}$ termoelektrik maddesi elde edilmiştir.

Synthesis and Characterization of Se Doped $Bİ_2Te_3$ Nanocrystalline Materials

In this study, the selenium (Se) doped bismuth telluride $Bİ_2Te_3$ nanocrystalline material synthesis by using a simple chemical routewas presented. The bismuth (III) nitrate pentahydrate $Bİleft(NO_3right).5H_2O$, telluride dioxide $TeO_2$ and Se powder were dissolved by nitricacid $HNO_3$. Herein, the two–step co–precipitation chemical route by using the sodium hydroxide NaOH and sodium borohydride$NaBH_4$ was employed. Different types of characterization such as X–ray diffraction (XRD), scanning electron microscopy (SEM),energy dispersive X–ray (EDX), transmission electron microscopy (TEM), atomic force microscopy (AFM), ultraviolet absorbance(UV) and Fourier transform infrared spectrometry (FT–IR) were occupied to the $Bi_2Te_{24}Se_{0.6}$ nanocrystalline powders and pelletswhich were developed. According to the measurement results, $Bi_2Te_{24}Se_{0.6}$ thermoelectric material was obtained in nano dimensions.

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