On the theory of optical sensing via infiltration of sculptured thin films

2010 ◽  
Author(s):  
Tom G. Mackay ◽  
Akhlesh Lakhtakia
Keyword(s):  
Thin Films ◽  
Optical Sensing ◽  
Sculptured Thin Films

scholarly journals X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 478
Author(s):  
Wan Mohd Ebtisyam Mustaqim Mohd Daniyal ◽  
Yap Wing Fen ◽  
Silvan Saleviter ◽  
Narong Chanlek ◽  
Hideki Nakajima ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Functional Group ◽  
Optical Sensing ◽  
Composite Thin Films ◽  
Cobalt Ions ◽  
X Ray ◽  
Sensing Applications

In this study, X-ray photoelectron spectroscopy (XPS) was used to study chitosan–graphene oxide (chitosan–GO) incorporated with 4-(2-pyridylazo)resorcinol (PAR) and cadmium sulfide quantum dot (CdS QD) composite thin films for the potential optical sensing of cobalt ions (Co2+). From the XPS results, it was confirmed that carbon, oxygen, and nitrogen elements existed on the PAR–chitosan–GO thin film, while for CdS QD–chitosan–GO, the existence of carbon, oxygen, cadmium, nitrogen, and sulfur were confirmed. Further deconvolution of each element using the Gaussian–Lorentzian curve fitting program revealed the sub-peak component of each element and hence the corresponding functional group was identified. Next, investigation using surface plasmon resonance (SPR) optical sensor proved that both chitosan–GO-based thin films were able to detect Co2+ as low as 0.01 ppm for both composite thin films, while the PAR had the higher binding affinity. The interaction of the Co2+ with the thin films was characterized again using XPS to confirm the functional group involved during the reaction. The XPS results proved that primary amino in the PAR–chitosan–GO thin film contributed more important role for the reaction with Co2+, as in agreement with the SPR results.

Linear and Circular Polarization Filters Using Sculptured Thin Films

1999 ◽  
Vol 10 (12) ◽  
pp. 30 ◽  
Author(s):  
Ian Hodgkinson ◽  
Qi Hong Wu ◽  
Akhlesh Lakhtakia ◽  
Russell Messier
Keyword(s):  
Thin Films ◽  
Circular Polarization ◽  
Sculptured Thin Films

Light pressure on chiral sculptured thin films and the circular Bragg phenomenon

Optik ◽  
2008 ◽  
Vol 119 (1) ◽  
pp. 7-12 ◽  
Author(s):  
Benjamin M. Ross ◽  
Akhlesh Lakhtakia
Keyword(s):  
Thin Films ◽  
Light Pressure ◽  
Sculptured Thin Films
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