Lateral Size Effect of Graphene Oxide on Its Surface-Enhanced Raman Scattering Property

Abstract

The lateral size effect of graphene oxide (GO) on surfaced-enhanced Raman scattering (SERS) property is systematically investigated by using size-fractionalized GO. For the size fractionalization without changes of chemical structure, large-sized GO (LGO) and small-sized GO (SGO) are separated from the assynthesized GO (AGO) by centrifugation and membrane filtration, respectively. The size-fractionalized GO sheets are immobilized on a solid substrate for the parallel comparison of their SERS property. As a result, we find that LGO shows considerably higher SERS property than SGO for typical Raman probes such as rhodamine 6G and crystal violet. Furthermore, the lateral size effect of GO derivatives is consistently observed when they are hybridized with plasmonic silver nanoparticles. These results indicate that LGO is superior to AGO and SGO as a SERS platform, and it is also quantitatively confirmed by calculating their enhancement factor.

Simultaneous Regulation of Surface Properties and Microstructure of Graphene Oxide Membranes for Enhanced Nanofiltration Performance

“…20,21 The conversion mechanism of these groups and bonds was then investigated by Raman spectroscopy. 26 As shown in Figure 2c, the characteristic G-bands of GO membranes are present at ca. 1594 cm −1 , the intensity of which increases with the increase of the alkaline treatment time.…”

“…The conversion mechanism of these groups and bonds was then investigated by Raman spectroscopy . As shown in Figure c, the characteristic G-bands of GO membranes are present at ca.…”

The volatile release evaluation of nicotine from snus products under different storage conditions based on surface-enhanced Raman spectroscopy technology

“…[17][18][19][20][21][22] For many more substrates, especially practical SERS substrates, their current development needs to consider the characteristics of high reliability, fast operation, easy maintenance and portability. [23][24][25] Researchers found that binary nano-or micro-particles composed of a superparamagnetic core and Au or Ag nanoshell, such as Fe 3 O 4 microparticles coated with Au nanorods (Fe 3 O 4 @-AuNRs), 26 Fe 3 O 4 coated with Au nanoparticles (Fe 3 O 4 @-AuNPs), 27 etc., have a lot of advantages. [27][28][29] These nanoscale noble metal nanoshell-coated magnetic particles would be useful, especially in the SERS analysis of chemical species dissolved in aqueous solutions because the magnetic particles can be readily enriched from the solution by means of an external magnetic eld without centrifugation or ltration.…”

“…17–22 For many more substrates, especially practical SERS substrates, their current development needs to consider the characteristics of high reliability, fast operation, easy maintenance and portability. 23–25 Researchers found that binary nano- or micro-particles composed of a superparamagnetic core and Au or Ag nanoshell, such as Fe 3 O 4 microparticles coated with Au nanorods (Fe 3 O 4 @AuNRs), 26 Fe 3 O 4 coated with Au nanoparticles (Fe 3 O 4 @AuNPs), 27 etc. , have a lot of advantages.…”

Bioinkjet Printing and Protein Tagging of Camouflaged Biosafe Quick Response Codes for Medicine Authentication

“…Therefore, even if the original packaging is not retained by pharmacists or patients, the risk of ingesting counterfeit medicines can be minimized. Analytical chemistry and spectroscopy methods (e.g., Raman, fluorescence, and near-infrared spectroscopy) can be used to analyze the exact biochemical compositions of drugs [13,18] for detecting counterfeit medicines at the dosage level; however, these approaches require expensive devices, specialized readers, and highly trained personnel, and patients and healthcare professionals often have limited access to such advanced tools.…”