CAJ | 학술논문

用超声的方法合成了硒纳米线.场发射扫描电镜(FESEM)结果表明产物的形貌比较均一.产物的结构通过透射电镜(TEM)和X.射线衍射仪(XRD)进行了进一步表征.TEM和XRD光谱的结果证明了所得硒纳米线为单晶结构且沿着[001]方向生长.所得硒纳米线在671 am处有一紫外光谱吸收峰,通过对光谱的计算,硒纳米线的能带为1.66 eV.基于一系列的生长过程,提出了硒纳米线的生长机理:硒粉溶解溶液中产生自由硒原子;当硒原子浓度过高时,硒原子结晶形成t型硒种子;由于各向异性晶体结构,连续提供的硒原子进入结晶种子形成线性纳米结构.此外,溶解和再结晶使α型硒转化为更稳定的t型硒.超声波可以提供适当的能量来调整这动态的平衡溶解和再结晶,进一步加快这一转变.
용초성적방법합성료서납미선.장발사소묘전경(FESEM)결과표명산물적형모비교균일.산물적결구통과투사전경(TEM)화X.사선연사의(XRD)진행료진일보표정.TEM화XRD광보적결과증명료소득서납미선위단정결구차연착[001]방향생장.소득서납미선재671 am처유일자외광보흡수봉,통과대광보적계산,서납미선적능대위1.66 eV.기우일계렬적생장과정,제출료서납미선적생장궤리:서분용해용액중산생자유서원자;당서원자농도과고시,서원자결정형성t형서충자;유우각향이성정체결구,련속제공적서원자진입결정충자형성선성납미결구.차외,용해화재결정사α형서전화위경은정적t형서.초성파가이제공괄당적능량래조정저동태적평형용해화재결정,진일보가쾌저일전변.
In this paper, the selenium nanowires were synthesized with the sonochemical approach. The result of field-emission scanning electron microscopy (FESEM) shows that the as-prepared selenium nanowires are relatively uniform and abundant. Transmission electron microscopy (TEM) and X-rays diffraction (XRD) were further adopted to characterize the structure of the as-prepared Se products. The results of high-resolution TEM and XRD prove that the as-prepared selenium nanowires are single crystalline in nature and [001] oriented. The UV-vis absorption spectra of the selenium nanowires is determined at 671 nm, and the calculated forbidden energy gap is 1.66 eV. Based on a series of growth processes, a possible growth mechanism of the selenium nanowires was also proposed as follows: Se powders dissolve in the solution and generate free selenium atoms; then, selenium atoms recrystallize and form crystalline t-Se nuclei when the concentration of selenium atoms is high enough; the continuous feeding of selenium atoms onto the crystalline seeds leads to the formation of linear nanostructures due to the anisotropic crystal structure. In addition, the dissolution and sequential recrystallization make α-Se transform into more stable t-Se. Ultrasonic can provide proper energy to adjust the dynamics equilibrium of dissolution and recrystallization, thus accelerate its transformation.