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Oxalate route was applied to synthesize mesoporous manganese oxides and their catalytic activity for VOCs’ oxidation was significantly promoted.

Infrared photodetectors have been widely applied in various fields, including thermal imaging, biomedical imaging, and communication. Van der Waals (vdW) integration based on 2D materials provides a new solution for high-performance infrared photodetectors due to the versatile device configurations and excellent photoelectric properties. In recent years, great progress has been made in infrared photodetectors based on vdW integration. In this review, recent progress in vdW integration-based infrared photodetectors is presented. First, the working mechanisms and advantages of photodetectors with different structures and band alignments are presented. Then, the recent progress of vdW integration-based infrared photodetectors is reviewed, focusing on 2D/nD (n = 0, 1, 2, 3) vdW integration, and the band engineering as well as the performance of the photodetectors are discussed in detail. Finally, a summary is delivered, and the challenges and future directions of vdW integration-based infrared photodetectors are provided.

Polarized photodetection based on anisotropic two-dimensional materials display promising prospects for practical application in optical communication and optoelectronic fields. However, most of the reported polarized photodetection are limited by the lack of valid tunable strategy and low linear dichroism ratio. A peculiar noble metal dichalcogenide-PdSe 2 with a puckered pentagonal structure and abnormal linear dichroism conversion-potentially removes these restrictions and is demonstrated in this study. Herein, azimuthdependent reflectance difference microscopy combined with anisotropic electrical transport measurements indicate strong in-plane anisotropic optical and electrical properties of two-dimensional PdSe 2. Remarkably, the typical polarization-resolved photodetection exhibits anisotropic photodetection characteristics with a dichroic ratio up to ≈1.8 at 532 nm and ≈2.2 at 369 nm, and their dominant polarization orientation differs by 90° corresponding to the a-axis and b-axis, respectively. The unique orientation selection behavior in polarizationdependent photodetection can be attributed to the intrinsic linear dichroism conversion. The results make 2D PdSe 2 a promising platform for investigating anisotropic structure-property correlations and integrated optical applications for novel polarization-sensitive photodetection.