Optical sensing and nonlinear optical properties of Cr-doped MoO3/PEDOT:PSS Nanocomposites

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Optical Materials Pub Date : 2024-10-13 DOI:10.1016/j.optmat.2024.116268

Karthikeyan Balasubramanian, Abhishek Kumar Choudhary, K. Arjun, Anjali Sharma

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Abstract

In this study, we observed a negative UV photoresponse that switched to a positive photoresponse in Cr-doped MoO₃/PEDOT:PSS nanocomposite films(NCF) prepared via drop-casting. MoO₃ and Cr-doped MoO₃ were synthesized using a hot oil bath co-precipitation method, combined with PEDOT:PSS (poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate)), and coated onto flexible OHP sheets. The open aperture z-scan method investigated the nonlinear optical properties of NCF on the glass substrate. The films were characterized by X-ray diffraction, scanning electron microscopic (SEM), UV–Vis spectroscopy, and Fourier Transformed Infrared (FTIR). Chromium doping caused minor changes in lattice parameters, crystalline size, and microstrain. UV spectroscopy revealed an increase in bandgap with higher Cr–MoO₃ concentrations. The photoresponse of different Cr–MoO₃ concentrations showed an initial current decrease under UV light, but the photoresponse became positive beyond a threshold and continued to improve. Nonlinear optical studies indicated saturable absorption in the nanocomposite. This work enhances our understanding of Cr-doped MoO₃/PEDOT:PSS nanocomposites, contributing to advancements in flexible UV photodetectors and nonlinear optical applications.

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掺杂铬的 MoO3/PEDOT:PSS 纳米复合材料的光传感和非线性光学特性

在这项研究中，我们观察到通过滴铸法制备的掺杂铬的 MoO3/PEDOT:PSS 纳米复合薄膜（NCF）的负紫外光响应转变为正紫外光响应。MoO3 和掺杂铬的 MoO3 采用热油浴共沉淀法合成，与 PEDOT:PSS（掺杂聚（4-苯乙烯磺酸）的聚（3,4-亚乙二氧基噻吩）结合，并涂布到柔性 OHP 薄膜上。开孔 Z 扫描法研究了玻璃基底上 NCF 的非线性光学特性。通过 X 射线衍射、扫描电子显微镜 (SEM)、紫外可见光谱和傅立叶变换红外 (FTIR) 对薄膜进行了表征。铬掺杂导致晶格参数、结晶尺寸和微应变发生微小变化。紫外光谱显示，随着 Cr-MoO3 浓度的增加，带隙也随之增加。不同浓度的 Cr-MoO3 的光响应在紫外光下显示出初始电流下降，但超过阈值后光响应变为正值并持续改善。非线性光学研究表明，纳米复合材料中存在可饱和吸收。这项研究加深了我们对掺杂铬的 MoO3/PEDOT:PSS 纳米复合材料的理解，有助于推动柔性紫外光检测器和非线性光学应用的发展。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.