Fabrication of a Flowerlike Ag Microsphere Film with Applications in Catalysis and as a SERS Substrate

Abstract

Three‐dimensional flowerlike Ag microstructures were assembled in situ on a substrate to fabricate Ag microflower (Ag MF) films. The morphology and size of the Ag MFs can be easily controlled by varying the reaction time. The mechanism of growth of Ag MFs was investigated by SEM. The shape evolution revealed that the Ag MFs are assembled from thin nanosheets composed of Ag nanoparticles (NPs), and the elemental composition of the NPs was evidenced by energy‐dispersive X‐ray spectroscopic analysis. The potential of the film as a catalyst in the reduction of nitrophenols was investigated. The reusability of the catalyst was estimated by recycling catalysis of 4‐nitrophenol. Moreover, the Ag MF film could be used as a versatile substrate for surface‐enhanced Raman scattering (SERS) for detection of Rhodamine 6G with a detection limit as low as 1 × 10–7 m. The results demonstrated that the Ag MF film exhibits excellent SERS enhancement ability and catalytic activity.

Na2Ti3O7@RF@Ag Heterostructures as Efficient Substrates for SERS and Photocatalytic Applications

“…The efficacy of the Na 2 Ti 3 O 7 @RF@Ag heterostructures for RhB detection was assessed using the SERS enhancement factor (EF), determined by the formula EF = I SERS × C 0 /I 0 × C SERS . Here, I SERS and I 0 represent the SERS (with Na 2 Ti 3 O 7 @RF@Ag heterostructures) and standard Raman intensities of RhB, while C SERS and C 0 denote the RhB concentration on the Na 2 Ti 3 O 7 @RF@Ag heterostructures (10 −6 M) and bare Ti foil (10 −4 M) [ 64 , 65 ]. The calculated maximum EF values for the RhB Raman band at 1647 cm −1 are 5.00 × 10 6 (0.15 mL AgNO 3 ), 1.09 × 10 7 (0.15 mL of AgNO 3 and 3 mL of L-ascorbic acid), and 2.88 × 10 6 (Ag-ion-sputtering time of 90 s), respectively.…”

Three‐dimensional‐printed holistic reactors with fractal structure for heterogeneous reaction

“…The reduction of 4‐NP is crucial to the chemical industries, because the reduced product 4‐aminophenol (4‐AP) is essential intermediates for synthesizing various analgesic and antipyretic drugs 39 . Hence, the reduction of 4‐NP by NaBH 4 is investigated as a model reaction to evaluate the as‐prepared Ag‐impeller's catalytic performance.…”

Research status of indole-modified natural products

“…Further studies implied that compound 98 damages the cell membrane and increases permeabilization. 148 Summary: sophoridine, matrine, and berberine indole derivatives all showed stronger biological activity than their parent compounds, among which are derivatives 93, 95, 96. The anti-tumor activity of these derivatives was stronger than that of the parent by three orders of magnitude.…”