Fabrication of hierarchical β-Bi2O3/AuAg microspheres for sensitive, selective and rapid detection of environment pollutants by surface-enhanced Raman spectroscopy

Engineering an Antifouling Electrochemical Sensing Platform Based on an All-in-One Peptide and a Hierarchical β-Bi2O3–Au Microsphere for Vancomycin Detection in Food

“…β-Bi 2 O 3 was synthesized according to previous research. 40 Briefly, at 432.15 K, the mixture of Bi(NO 3 ) 3 •5H 2 O, ethylic acid, anhydrous ethanol, and tetraethoxysilane was transferred to a stainless-steel autoclave for a hydrothermal reaction for 48 h. Then, the obtained compound was calcined at 673.15 K for 5 h to obtain a light-yellow sheet-like β-Bi 2 O 3 . Subsequently, β-Bi 2 O 3 −Au was prepared by an in situ reduction method on the basis of β-Bi 2 O 3 .…”

Flower-like Ag-decked non-stoichiometric Bi2O3−x/rGO hybrid nanocomposite SERS substrates for an effective detection of Rhodamine 6G dye molecules

“…22–24 Although bismuth oxide and its hybrids with carbon materials have well-known applications in photocatalysis and electrocatalysis, electrochemical energy storage systems, and biomedical fields, 25–28 there is only a single report exploring Bi 2 O 3 -based metal composites for SERS detection of environmental pollutants. 29 The SERS activity of reduced graphene oxide (rGO)-based Bi 2 O 3 or its non-stoichiometric hybrid nanocomposites has not been investigated to date. Exploring the hybrid thin-film nanocomposites of rGO-Bi 2 O 3 /Bi 2 O 3− x and Ag-incorporating rGO-Ag-Bi 2 O 3 /Bi 2 O 3− x as SERS-active substrates will illuminate the choice of semiconductor-based SERS substrates for chemical sensors.…”

Au nanoparticles decorated β-Bi2O3 as highly-sensitive SERS substrate for detection of methylene blue and methyl orange

“…Subsequently, to further enhance the Raman activity of the β-Bi 2 O 3 substrate, a water bath method was employed to load Au NPs onto β-Bi 2 O 3 , results in a two-order-of-magnitude enhancement in detection sensitivity for both MB and MO molecules. Besides, β-Bi 2 O 3 combined with noble metal exhibits superior self-cleaning properties due to photodegradation of dye molecules, 34 making it suitable for repeated application in pollutant detection. We attribute the higher SERS enhance-ment to the following reasons: (1) improved hotspots induced by Au NPs; (2) multiple electron transfers between the substrate and adsorbed molecules.…”