Laser Patterning of the Sb₂O₃ Atomic Thin Layer Assisted by Near Field Heating

Abstract

As an important member recently joining the family of two-dimensional dielectrics, the antimony oxide atomic thin layer exhibits extremely high dielectric constant and breakdown voltage, intriguing great enthusiasm to explore these novel physical properties for applications. Herein, transformation of chemical vapor deposition grown α-Sb 2 O 3 flakes into α-Sb 2 O 4 was achieved under ambient conditions using a near field heating effect provided by thin gold films. Flakes with a thickness of 4−42 nm can be fully transformed in 20 s with irradiation of a continuous-wave 532 nm laser. Such a short transformation time further allows laser patterning on α-Sb 2 O 3 flakes with microscale spatial resolution. These results greatly enrich the knowledge of this novel 2D dielectric material and facilitate its application in atomic scale electronic devices.

Strategy to Prepare Core–Shell Microspheres for Laser Direct Writing on Polymers: Microemulsion Method

“…During the LDW process, these laser absorbers first absorbed the laser to convert the light energy into heat energy, inducing instant high temperatures. Thus, the nearby polymer resin was immediately carbonized to bring about the color change. , …”

“…Thus, the nearby polymer resin was immediately carbonized to bring about the color change. 34,37 In a previous report, Zhong et al melt-blended Bi 2 O 3 with thermoplastic polyurethane (TPU) to prepare TPU@Bi 2 O 3 composites. 38 Since the neat TPU could not absorb the laser, the addition of Bi 2 O 3 played a role in energy conversion, inducing localized pyrolysis and carbonization of TPU to produce clear marks or patterns on the surface.…”

“…Nevertheless, for most polymers, LDW is quite difficult. When the NIR laser irradiates a polymer’s surface, such as polyethylene (PE), polypropylene (PP), acrylonitrile–styrene copolymer (AS), and nylons, because most polymers have a weak or even no absorption to the laser no visible color change can be produced. , Fortunately, researchers found that adding laser absorbers to polymers effectively solved this problem. − For instance, antimony trioxide (Sb 2 O 3 ), tin dioxide (SnO 2 ), titanium dioxide (TiO 2 ), and bismuth trioxide (Bi 2 O 3 ) were all proved to be effective. During the LDW process, these laser absorbers first absorbed the laser to convert the light energy into heat energy, inducing instant high temperatures.…”