Photo-induced-heat localization on nanostructured metallic glasses
Photo-induced-heat localization on nanostructured metallic glasses
复制标题
纳米结构金属玻璃的光致热局部化
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
A. Bernussi
中科院分区：
文献类型：
--
作者：
Ceren Uzun;Niloofar Kahler;L. Peralta;G. Kumar;A. Bernussi
具有高光热转换效率的材料是可再生能源应用的必要条件。光激发是在相对较低的激发光功率下产生可控和局部热的有效方法。然而，金属表面的侧向热扩散和低光热转换效率仍然是一个挑战。表面纳米工程已被证明是进一步吸收和产生热量的成功方法。本文表明，在红外光学照明下，非晶金属玻璃纳米棒阵列可以实现明显的空间热局部化和高温。热成像测量显示，即使在低光功率激励条件下，照明和非照明区域之间也存在明显的温度差异。这个属性允许在有纹理的金属玻璃表面上产生易读的光致热图案。
Materials with large photo-thermal energy conversion efficiency are essential for renewable energy applications. Photo-excitation is an effective approach to generate controlled and localized heat at relatively low excitation optical powers. However, lateral heat diffusion to the surrounding illuminated areas accompanied by low photo-thermal energy conversion efficiency remains a challenge for metallic surfaces. Surface nanoengineering has proven to be a successful approach to further absorption and heat generation. Here, we show that pronounced spatial heat localization and high temperatures can be achieved with arrays of amorphous metallic glass nanorods under infrared optical illumination. Thermography measurements revealed marked temperature contrast between illuminated and non-illuminated areas even under low optical power excitation conditions. This attribute allowed for generating legible photo-induced thermal patterns on textured metallic glass surfaces.