Scalable synthesis of heterostructure of Fe2O3–Au nanomaterials for application in biological detection

In terms of developing high-performing, multifunctional hetero-nanostructures, an exact control of the growth dynamics at the interface of metal nanoparticles (NPs) and metal oxides is of great significance. Having this in mind, we reported a facile and efficient approach to anchor and control the growth process of Au NPs on the surface of iron oxide, and to synthesis α –Fe 2 O 3 –Au heterogeneous structure. The nanocomposite exhibits its outstanding multifunctional performance, the energy absorption rate and energy transfer efficiency of α –Fe 2 O 3 –Au heterogeneous structure is obviously more than that of α –Fe 2 O 3 materials. FDTD simulation results also show that α –Fe 2 O 3 –Au heterogeneous structure have excellent absorption light property and surface Raman effect compared to the single materials, and exhibit enhanced analysis enhancement factor (to 5 × 10 4 ) with R6G molecule probe in SERS measurement. Furthermore, for the electrocatalytic activity of H 2 O 2, the sensitivity and detection limit is 42.265 μ A mM −1 cm −2 and 1.166 μ M, respectively. This work provides an innovative synthetic route for new heterogeneously structured nanocomposites.