Kamran Muhammad Arshad
Department of Physics, College of Science, Majmaah University Majmaah 11952, Saudi Arabia.
Nanotechnology. 2018 Jun 29;29(26):265602. doi: 10.1088/1361-6528/aabdc2. Epub 2018 Apr 12.
For the first time, 1D Ni ion doped CdS nanowires (NWs) were synthesized via chemical vapour deposition (CVD). The synthesized CdNiS NWs were single crystalline. We have reported here the investigation of optical, electrical and magnetic properties of prepared NWs for optoelectronic and spintronic applications. Successful incorporation of Ni ions in an individual CdS NW has been confirmed through several characterization tools: significantly higher angle and phonon mode shift were observed in the XRD and Raman spectra. SEM-EDX and XPS analysis also confirmed the presence of Ni ions. Room temperature photoluminescence (RT-PL) showed multiple peaks: two emission peaks in the visible region centered at 517.1 nm (green), 579.2 nm (orange), and a broad-band near infra-red (NIR) emission centered at 759.9 nm. The first peak showed 5 nm red shift upon Ni doping, hinting at the formation of exciton magnetic polarons (EMPs), and broad NIR emission was observed in both chlorides and bromides, which was assigned to d-d transition of Ni ions whose energy levels lying at 749.51 nm (13 342 cm) and 750.98 nm (13 316 cm) are very close to NIR emission. Orange emission not only remained at same peak position-its PL intensity was also significantly enhanced at 78 K; this was assigned to d-d transition (A → E) of Ni ions. It was observed that 11.4% Ni ion doping enhanced the conductivity of our sample around 20 times, and saturation magnetization (M) increased from 7.2 × 10 Am/Kg to 1.17 × 10 Am/Kg, which shows promise for optoelectronic and spintronic applications.
首次通过化学气相沉积（CVD）合成了一维镍离子掺杂硫化镉纳米线（NWs）。合成的CdNiS NWs为单晶。我们在此报告了对制备的NWs的光学、电学和磁学性质进行的研究，以用于光电子和自旋电子应用。通过几种表征工具已证实镍离子成功掺入单个CdS NW中：在XRD和拉曼光谱中观察到明显更高的角度和声子模式位移。SEM-EDX和XPS分析也证实了镍离子的存在。室温光致发光（RT-PL）显示出多个峰：可见光区域有两个发射峰，中心分别位于517.1 nm（绿色）、579.2 nm（橙色），以及一个中心位于759.9 nm的宽带近红外（NIR）发射峰。镍掺杂后第一个峰出现了5 nm的红移，这暗示着激子磁极化子（EMPs）的形成，并且在氯化物和溴化物中均观察到宽带近红外发射，这归因于镍离子的d-d跃迁，其能级位于749.51 nm（13342 cm）和750.98 nm（13316 cm），与近红外发射非常接近。橙色发射不仅保持在相同的峰位置，其PL强度在78 K时也显著增强；这归因于镍离子的d-d跃迁（A→E）。观察到11.4%的镍离子掺杂使我们样品的电导率提高了约20倍，饱和磁化强度（M）从7.2×10 Am/Kg增加到1.17×10 Am/Kg，这显示出在光电子和自旋电子应用方面的潜力。
