Alberding Brian G, DeSario Paul A, So Christopher R, Dunkelberger Adam D, Rolison Debra R, Owrutsky Jeffrey C, Heilweil Edwin J
Radiation Physics Division, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA.
Chemistry Division, Code 6100, U.S. Naval Research Laboratory, Washington, D.C., 20375 USA.
J Phys Chem C Nanomater Interfaces. 2017 Feb 23;121(7):4037-4044. doi: 10.1021/acs.jpcc.6b12382. Epub 2017 Jan 25.
Thin-film ruthenium dioxide (RuO) is a promising alternative material as a conductive electrode in electronic applications because its rutile crystalline form is metallic and highly conductive. Herein, a solution-deposition multi-layer technique is employed to fabricate ca. 70 ± 20 nm thick films (nanoskins) and terahertz spectroscopy is used to determine their photoconductive properties. Upon calcining at temperatures ranging from 373 K to 773 K, nanoskins undergo a transformation from insulating (localized charge transport) behavior to metallic behavior. Terahertz time-domain spectroscopy (THz-TDS) indicates that nanoskins attain maximum static conductivity when calcined at 673 K (σ = 1030 ± 330 S·cm). Picosecond time-resolved Terahertz spectroscopy (TRTS) using 400 nm and 800 nm excitation reveals a transition to metallic behavior when calcined at 523 K. For calcine temperatures less than 523 K, the conductivity increases following photoexcitation (ΔE < 0) while higher calcine temperatures yield films composed of crystalline, rutile RuO and the conductivity decreases (ΔE > 0) following photoexcitation.
薄膜二氧化钌（RuO）作为电子应用中的导电电极是一种很有前景的替代材料，因为其金红石晶体形式具有金属性且导电性高。在此，采用溶液沉积多层技术制备约70±20纳米厚的薄膜（纳米皮），并使用太赫兹光谱来确定其光电导性能。在373 K至773 K的温度下煅烧时，纳米皮从绝缘（局部电荷传输）行为转变为金属行为。太赫兹时域光谱（THz-TDS）表明，纳米皮在673 K煅烧时达到最大静态电导率（σ = 1030±330 S·cm）。使用400 nm和800 nm激发的皮秒时间分辨太赫兹光谱（TRTS）显示，在523 K煅烧时转变为金属行为。对于煅烧温度低于523 K的情况，光激发后电导率增加（ΔE < 0），而较高的煅烧温度会产生由结晶金红石RuO组成的薄膜，光激发后电导率降低（ΔE > 0）。
