Three-dimensional ordered Ag/ZnO/Si hierarchical nanoflower arrays for spatially uniform and ultrasensitive SERS detection

Chemically Etched Nanoporous Copper and Galvanically Displaced Silver Nanoflowers for SERS Sensing

“…For the current Ag nano @Cu NPS , the Raman spectra of 4-MPBA recorded from different locations are similar in spectral profile, peak position, and intensity (Figure ). The relative standard deviation (RSD) estimated for the most intense Raman band (1590 cm –1 ) is only 7%, which is on par with other reported uniform SERS substrates. − Further, the stability of the substrates was investigated by recording the SERS spectra of 4-MBA on both nanoporous copper and silver nanoflower over a period of time (Figure S4). During the first 5 days, the intensity varied a maximum of 13% and ∼3% for Cu NPS and Ag nano Cu NPS , respectively.…”

Silver nanoparticle on zinc oxide array for label-free detection of opioids through surface-enhanced raman spectroscopy

“…The ZnO array provides a 3 dimensional (3D) substrate for the Ag particles and the effectiveness of such 3D structure for SERS based sensing has been proven by previous works. [47][48][49] The high electromagnetic enhancement factor induced by the 3D ZnO array structure mainly stems from the high surface area to volume ratio that allows for a much higher load of metal particles. Other advantages of ZnO arrays include their inability to absorb visible light, high controllability over size and dimensions, stability in regular environment, and suitability for mass production.…”

Aluminum sheet-induced porous zinc oxide nanosheets decorated with silver nanoparticles for ultrasensitive SERS sensing of crystal violet

“…For instance, three-dimensional ordered Ag/ZnO/Si hierarchical nanoflower arrays were fabricated which showed an ultrasensitive detection limit for Rhodamine 6G (R6G) as low as 1 × 10 -12 mol•L -1 . 20 Ag-coated flower-like ZnO nanorods arrays were prepared for highly sensitive SERS detection of R6G at low concentration of 1 × 10 -14 mol•L -1 . 21 It is well known that the ZnO nanosheets has been proved to be effective in promoting SERS activity, in that their tip effects could provide more hot spots for AgNPs which greatly enhance the electromagnetic (EM) enhancement effect of ZnO nanosheets/Ag system.…”