Panigrahy S, Dhar J C
J Nanosci Nanotechnol. 2018 Oct 1;18(10):7155-7162. doi: 10.1166/jnn.2018.15508.
The Er2O3 nanowires (NWs) were synthesized on Si substrate by using glancing angle deposition technique inside E-beam evaporator. The field-emission gun scanning electron microscopy (FEG-SEM) images showed perpendicular and highly porous Er2O3 NWs with average diameter ∼50 nm and length ∼350 nm. The crystallinity of the Er2O3 NWs improved with annealing but degraded at higher temperature annealing at 900 °C. Transmission electron microscopy (TEM) images show the unsymmetrical NW growth and grain size enhancement with increasing annealing temperature. In addition, two-fold enhanced absorption was observed for as deposited as compared to the annealed samples. A low intense photoluminescence was obtained for the as deposited sample as compared to the annealed samples due to the presence of defects and dangling bonds. The as deposited Er2O3 NW also showed a hydrophobic surface property with a contact angle of as high as 107.4° due to the air trapped in between Er2O3 NWs and oxygen vacancies which turned to hydrophilic surface with contact angle 27° and 25° when annealed at higher temperature of 750 °C and 900 °C respectively.
通过在电子束蒸发器内使用掠角沉积技术，在硅衬底上合成了Er2O3纳米线（NWs）。场发射枪扫描电子显微镜（FEG-SEM）图像显示，垂直且高度多孔的Er2O3纳米线平均直径约为50nm，长度约为350nm。Er2O3纳米线的结晶度随退火而提高，但在900°C的高温退火下会下降。透射电子显微镜（TEM）图像显示，随着退火温度的升高，纳米线生长不对称且晶粒尺寸增大。此外，与退火样品相比，沉积态样品的吸收增强了两倍。由于存在缺陷和悬空键，与退火样品相比，沉积态样品获得的光致发光强度较低。沉积态的Er2O3纳米线还表现出疏水表面特性，接触角高达107.4°，这是由于被困在Er2O3纳米线之间的空气和氧空位所致，当在750°C和900°C的较高温度下退火时，其接触角分别变为27°和25°，从而转变为亲水表面。
