Adsorbable and self-supported 3D AgNPs/G@Ni foam as cut-and-paste highly-sensitive SERS substrates for rapid in situ detection of residuum

Abstract

We have proposed a synthetic approach to produce self-supported and bendable surface-enhanced Raman scattering (SERS)-based 3D chemical sensors with high adsorptivity. Such 3D substrates consist of foam-like graphene macrostructures obtained by template-directed chemical vapour deposition on nickel foams (interconnected 3D scaffold of nickel) and uniform and high-density Ag nanoparticles wrapping around the foam graphene, via seed-mediated in situ growth process. Such 3D AgNPs/G@Ni foam substrates show high-quality SERS performance in terms of Raman signal reproducibility and sensitivity for the analyte, resulting from the high density and homogeneity of "hot spots" on AgNPs/G@Ni foam, multiple cascaded amplication (localized surface plasmon mode and optical standing waves or optical refraction) of incident laser to the 3D foam structures and powerful support from nickel scaffold. Moreover, in virtue of the high adsorptivity and sensitivity of AgNPs/G@Ni foam, the low-concentration crystal violet molecules can be easily traced in the curvilinear fish surface, by simply swabbing the surface to achieve molecules concentration effect in the practical applicability. This work shows promising potential in developing the applications of SERS in the foodstuffs processing and security field.

Hierarchical Particle-In-Quasicavity Architecture for Ultratrace In Situ Raman Sensing and Its Application in Real-Time Monitoring of Toxic Pollutants

“…The relative standard deviation (RSD) curve of them can be further obtained, which is nearly unfluctuating as plotted and shown in Figure a (top). The average RSD value of the curve is calculated as 12.8%, and it is better than many known ones of same-type substrates, , implying the well uniformity of the PIQC ZnO/Ag. Repeatability was estimated by the similar way, 20 different samples of PIQC ZnO/Ag were first prepared by different batches, and subsequently the Raman spectra were collected from them and shown as the 2D color mapping in Figure b (bottom).…”

Three-Dimensional Hierarchical Reticular Nanostructure of Fulfora candelaria Wing Decorated by Ag Nanoislands as Practical SERS-Active Substrates

“…Three-dimensional (3D) natural biological structures with nanoscale arrays as templates are adopted to demonstrate the correlation between morphology and SERS activity of the substrates, which arouses great attention recently [ 18 , 19 , 20 ]. An interesting morphology of a 3D hierarchical reticular structure is discovered on the wings of Fulfora candelaria , the use of which as the bioscaffold can not only offer large surface area for the deposition of metallic nanoparticles and the absorption of analyte molecules, but also obtain the full utilization of incident laser, which are the prominent advantages that one-dimensional (1D) and two-dimensional (2D) SERS substrates do not have [ 21 ]. In addition, the natural Fulfora candelaria wing (FCW) directly acts as the substrate template, which greatly simplifies the complex experimental operations during the process of template fabrication and avoids the environmental pollution caused by the experimental garbage.…”

Quantum Hall-like effect in electrochemical systems due to extra-dimension embedded in 3D graphene at room temperature

“…Apart from zero-, one-and twodimensional graphene structures, three-dimensional microporous Graphene Foam (GF) was successfully fabricated during 2010s 1 .. Afterwards, wide applications of GF were reported from supercapacitors 2 , field-effect transistors 3 , electrochemical sensors [4][5] and Surface-Enhanced Raman Scattering (SERS) substrate [6][7] . In theoretical point of view, the study of electronic transport in graphene-based materials could triggered the on-going progress of physics of this two-dimensional material [8][9] .…”