High-performance γ-MnO <sub>2</sub> Dual-Core, Pair-Hole Fiber for Ultrafast Photonics

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Abstract

Manganese dioxide (MnO ₂ ) is a widely used and well-studied 3-dimensional (3D) transition metal oxide, which has advantages in ultrafast optics due to large specific surface area, narrow bandgap, multiple pores, superior electron transfer capability, and a wide range of light absorption. However, few studies have considered its excellent performance in ultrafast photonics. γ-MnO ₂ photonics devices were fabricated based on a special dual-core, pair-hole fiber (DCPHF) carrier and applied in ultrafast optics fields for the first time. The results show that the soliton molecule with tunable temporal separation (1.84 to 2.7 ps) and 600-MHz harmonic solitons are achieved in the experiment. The result proves that this kind of photonics device has good applications in ultrafast lasers, high-performance sensors, fiber optical communications, etc., which can help expand the prospect of combining 3D materials with novel fiber for ultrafast optics device technology.

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Catalytic oxidation of formaldehyde over manganese oxides with different crystal structures

Jianghao Zhang, Yaobin Li, Lian Wang … (2015)

δ-MnO 2 was the best catalyst for catalytic oxidation of HCHO among four types of MnO 2 catalyst. α-, β-, γ- and δ-MnO 2 catalysts were prepared by a hydrothermal method and tested for the catalytic oxidation of formaldehyde (HCHO) at low temperature. Dramatic differences in activities among the MnO 2 catalysts with different crystal structures were observed. The δ-MnO 2 catalyst exhibited the best activity among the four catalysts and achieved nearly complete HCHO conversion at 80 °C, while the α-, β- and γ-type MnO 2 obtained 100% HCHO conversion at 125 °C, 200 °C, 150 °C, respectively. The catalysts were next characterized by Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD), Field-Emission Scanning Electron Microscopy (FE-SEM), temperature-programmed reduction by H 2 (H 2 -TPR), X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption of HCHO (HCHO-TPD) methods to investigate the factors influencing the catalytic activity. Based on the characterization results, it is supposed that the tunnel structure and active lattice oxygen species are the main factors that contribute to the excellent performance of δ-MnO 2 . According to the high catalytic performance and facile preparation process, δ-MnO 2 may potentially be used as a support in applications of supported catalysts.

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Author and article information

Journal

Title: Ultrafast Science

Abbreviated Title: Ultrafast Sci

Publisher: American Association for the Advancement of Science (AAAS)

ISSN (Print): 2097-0331

ISSN (Electronic): 2765-8791

Publication date Created: January 2023

Publication date (Electronic): January 16 2023

Publication date (Print): January 2023

Volume: 3

Affiliations

[1 ]School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710000, Shaanxi, China.

[2 ]School of Electronic Engineering, Guangxi University of Science and Technology, Liuzhou 545006, Guangxi, China.

[3 ]School of Computer Science and Engineering, Macau University of Science and Technology, Taipa 999078, Macau, China.

[4 ]State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, Shaanxi, China.

Article

DOI: 10.34133/ultrafastscience.0006

SO-VID: 544c5887-c30e-4734-b397-4bfe49eaba2a

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