Three-dimensional silver nanoparticles decorated vertically aligned Si nanowires (Si NWs) are effective surface-enhanced Raman spectroscopy (SERS) substrates for molecular detection at low concentration levels. The length of Si NWs prepared by silver assisted electroless etching is increased with an increase in etching time, which resulted in the reduced optical reflection in the visible region. These substrates were tested and optimized by measuring the Raman spectrum of standard dye Rhodamine 6G (R6G) of 10 nM concentration. Further, effective SERS enhancements of ∼105 and ∼104 were observed for the cytosine protein (concentration of 50 μM) and ammonium perchlorate (oxidizer used in explosives composition with a concentration of 10 μM), respectively. It is established that these three-dimensional SERS substrates yielded considerably higher enhancement factors for the detection of R6G when compared to previous reports. The sensitivity can further be increased and optimized since the Raman enhancement was found to increase with an increase in the density of silver nanoparticles decorated on the walls of Si NWs.
Skip Nav Destination
Three-dimensional hybrid silicon nanostructures for surface enhanced Raman spectroscopy based molecular detection
Article navigation
7 January 2018
Research Article|
January 02 2018
Three-dimensional hybrid silicon nanostructures for surface enhanced Raman spectroscopy based molecular detection
V. S. Vendamani;
V. S. Vendamani
a)
1
School of Physics, University of Hyderabad
, Hyderabad 500046, Telangana, India
Search for other works by this author on:
S. V. S. Nageswara Rao;
S. V. S. Nageswara Rao
1
School of Physics, University of Hyderabad
, Hyderabad 500046, Telangana, India
Search for other works by this author on:
S. Venugopal Rao
;
S. Venugopal Rao
2
Advanced Centre of Research in High Energy Materials (ACRHEM), University of Hyderabad
, Hyderabad 500046, Telangana, India
Search for other works by this author on:
D. Kanjilal;
D. Kanjilal
3
Inter-University Accelerator Centre
, New Delhi 110067, India
Search for other works by this author on:
A. P. Pathak
A. P. Pathak
b)
1
School of Physics, University of Hyderabad
, Hyderabad 500046, Telangana, India
4
Department of Physics, Rajiv Gandhi University of Knowledge Technologies (RGUKT)/IIIT
, Basar, Telangana 504107, India
Search for other works by this author on:
a)
Present address: Inter-University Accelerator Centre, New Delhi 110067, India.
b)
Author to whom correspondence should be addressed: anandp5@yahoo.com and appsp@uohyd.ernet.in
J. Appl. Phys. 123, 014301 (2018)
Article history
Received:
August 21 2017
Accepted:
December 01 2017
Citation
V. S. Vendamani, S. V. S. Nageswara Rao, S. Venugopal Rao, D. Kanjilal, A. P. Pathak; Three-dimensional hybrid silicon nanostructures for surface enhanced Raman spectroscopy based molecular detection. J. Appl. Phys. 7 January 2018; 123 (1): 014301. https://doi.org/10.1063/1.5000994
Download citation file:
Sign in
Don't already have an account? Register
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Sign in via your Institution
Sign in via your InstitutionPay-Per-View Access
$40.00