The new era of Internet of Things has spawned the research in multifunctional photodetectors. Herein, intriguing features of dual-polarity and flexibility are creatively embraced in Sb2Se3/ZnO bilayer photodetectors. The current...

Deficient intrinsic species and suppressed Curie temperatures (Tc) in two-dimensional (2D) magnets are major barriers for future spintronic applications. As an alternative, delaminating non-van der Waals (vdW) magnets can offset...

spectroscopy (ICP-AES), and surface plasmon resonance sensing. [4][5][6] Although these methods have high detection performances, the complicated preprocessing process and the excessive cost limit their range of use and the detection rate. On the other hand, with the advancement of fluorescence technology, fluorescence detection techniques for metal ions by monitoring the fluorescence enhancement, quenching, or shifting of peak positions have attracted great interests. This type of method has advantages of strong visibility, simple operation, wide detection range, and low price. [7] Recently, quantum dot (QD) fluorescent probes are gradually receiving more attentions. Compared with the traditional organic fluorescent materials, QD fluorescent probes have narrower emission spectra, better stability, and photobleaching resistance. For example, carbon QDs, [8,9] CdSe QDs, [10] CdS QDs, [11] perovskites QDs, [12] and a combination of functional molecules and QDs have been studied to detect metal ions such as Fe 3+ , Pb 2+ , Hg 2+ , Zn 2+ , and Cd 2+ . [13][14][15][16][17][18] However, currently reported fluorescent probes can be used in only one solvent, it is therefore necessary to develop fluorescent probes with strong selectivity, wide detection range, and low detection limit, which can be used in both aqueous and organic solutions.Black phosphorus (BP) as one of the three major allotropes of phosphorus is a 2D van der Waals material whose atomic layers are stacked by weak van der Waals forces. BP can be stripped into nanosheets down to a single layer or quantum dots with bandgaps varying from 0.3 (bulk BP) to 2.0 eV. Due to this unique property, BP has the size and composition-dependent light absorption, long exciton lifetime, high photo luminescence quantum yield, and ability of surface modification. So far, BP has been used as photothermal agents, photodetectors, photocatalysts, organic photovoltaics, electrocatalysts, and the storage media. [19][20][21][22][23][24] BP has also been studied in the field of sensors, such as humidity sensors, [25] ratiometric fluorescent probes developed by the surface modification of organic molecules, [26,27] field effect transistor detection of metal ions. [28] In addition, BP has a wide range of applications in the biological field, including the medicine, drug carriers, and cancer treatment. [29][30][31] In this research, we have successfully prepared black phosphorus quantum dots (BP QDs) with green fluorescence emission, which can directly detect trace Hg 2+ and Cu 2+ ions without the help of organic molecules. In particular, Fluorescence method for detecting metal ions has advantages of fast detection speed, simple operation, and low price over the conventional methods. Black phosphorus quantum dots (BP QDs) have high photoluminescence quantum yield and modifiable surface, which have great potential in the field of fluorescent probes. In this study, high quality BP QDs are prepared by pyrolysis method and are first time used as trace metal ion probes in both organic solut...

The electric field control of Raman scattering for small molecules can be realized in direct semiconducting antimonene-based field effect transistor.