Handbook of Graphene, Volume 6: Volume 6: Biosensors and Advanced Sensors by Palys Barbara;Palys Barbara;

Author:Palys, Barbara;Palys, Barbara; [Palys, Barbara]
Language: eng
Format: epub
ISBN: 9781119469766
Publisher: John Wiley & Sons, Incorporated
Published: 2019-06-12T14:14:00+00:00

Figure 12.7 The wavelength separation of dual peaks against the RI change (blue symbols: bare dLPG; red symbols: GO-dLPG).

Table 12.1 Comparison of RI sensitivities of noncoated dLPG and GO-coated dLPG.

RI sensitivity

RI

1.33–1.35 RI

1.38–1.42 RI

1.43–1.44

Noncoated dLPG 1255 nm/RIU 2902 nm/RIU 5761 nm/RIU

GO-coated dLPG 2538 nm/RIU 3390 nm/RIU 8956 nm/RIU

Enhancement of RI sensitivity 202% 117% 155%

The GO deposition enhances the light–matter interaction leading to the increase of RI sensitivity. The RI sensing mechanism relies on the sensitivity of long period grating’s attenuation bands to the properties of overlay material, such as the thickness and the RI. It was reported that the rapid variation of the gradient of the phase-matching curves near the DTP caused the sensitivity of the particular resonant bands to environmental perturbation to be determined by its proximity to its DTP [8]. It should be noted that the GO coating layer has tuned dual peaks away from its DTP that might sacrifice the bulk RI sensitivity of dLPG. However, a small weakness did not cover the merits of GO as a coating material. In particular, for a 49.2 nm-thickness GO-coated dLPG, the RI sensitivity was enhanced over 155% in low RI region (1.33–1.35), in which bioassays and biological events were usually carried out. Moreover, GO functionalized dLPG demonstrates remarkable sensitivity in biosensing, which will be discussed in the following sections.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.