On page 6996, H. Zhang, X.‐F. Yu, and co‐workers describe a simple liquid exfoliation method for production of phosphorene with excellent water stability, controllable size and layer number, as well ...as high yield. The resulting 1–4‐layered phosphorene exhibits layer‐dependent Raman scattering characteristics, which provide a fast and efficient means for in situ determination of the layer number of phosphorene.
Ultrathin Bi2Se3 nanosheets are prepared by a solution method. As described on page 4136 by X.‐F. Yu, Q.‐Q. Wang, P. K. Chu, and co‐workers, such ultrathin Bi2Se3 nanosheets exhibit strong near ...infrared (NIR) light absorption, excellent photothermal and photoacoustic performance, enabling efficient imaging‐guided photothermal therapy. Furthermore, these Bi2Se3 nanosheets are well metabolized. These attractive properties render the Bi2Se3 nanosheets promising as a NIR‐triggered theranostic agents in cancer therapies.
Atomically thin black phosphorus (BP) has attracted increasing interest owing to its unique electronic and optical properties, yet its application is hampered by its poor air and water stability. In ...their Communication on page 5003 ff., X.‐F. Yu, P. K. Chu, and co‐workers designed a titanium sulfonate ligand to coordinate with BP to prevent oxidation. The coordinated BP surface exhibited robust stability in air and water, thereby extending the lifetime and spurring broader applications of BP.
Bi
2
Se
3
has been widely used as a promising photothermal and photoacoustic agent recently. Herein, two-dimensional (2D) Bi
2
Se
3
nanosheets with different sizes of about 30 nm (Bi
2
Se
3
-30) and ...80 nm (Bi
2
Se
3
-80) have been successfully synthesized
via
solution-based methods. Both of the Bi
2
Se
3
nanosheets possess high near-infrared (NIR) optical absorption, efficient photothermal conversion and excellent photoacoustic behaviors. Meanwhile, the Bi
2
Se
3
-30 nanosheets perform better. These results indicate the smaller Bi
2
Se
3
nanosheets are more promising for optical diagnostic and photothermal therapy.
Two Bi
2
Se
3
nanosheets have been successfully synthesized and exhibit excellent optical performances, and the smaller size one performs better.
A reliable surface-enhanced Raman scattering (SERS) substrate composed of two-dimensional (2D) MXene (Ti
C
T
) nanosheets and gold nanorods (AuNRs) is designed and fabricated for sensitive detection ...of organic pollutants. The AuNRs are uniformly distributed on the surface of the 2D MXene nanosheets because of the strong electrostatic interactions, forming abundant SERS hot spots. The MXene/AuNR SERS substrate exhibits high sensitivity and excellent reproducibility in the determination of common organic dyes such as rhodamine 6G, crystal violet, and malachite green. The detection limits are 1 × 10
, 1 × 10
, and 1 × 10
M, and relative standard deviations determined from 13 areas on each sample are 18.1, 10.1, and 15.6%, respectively. In the determination of more complex organic pesticides and pollutants, the substrate also shows excellent sensitivity and quantitative detection, and the detection limits for thiram and diquat of 1 × 10
and 1 × 10
M, respectively, are much lower than the contaminant levels stipulated by the US Environmental Protection Agency. The MXene/AuNR composite constitutes an efficient SERS platform for reliable and high-sensitivity environmental analysis and food safety monitoring.
Atomschichten …… von schwarzem Phosphor (BP) sind wegen ihrer einzigartigen elektronischen und optischen Eigenschaften von Interesse, ihre schlechte Luft‐ und Wasserbeständigkeit steht Anwendungen ...aber im Wege. In ihrer Zuschrift auf S. 5087 ff. entwickeln X.‐F. Yu, P. K. Chu und Mitarbeiter einen Titan‐Sulfonsäure‐Komplex, der an schwarzen Phosphor koordiniert und dessen Oxidation verhindert. Dabei entsteht eine robuste Phosphoroberfläche, die gegen Luft und Wasser stabil ist.
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