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GaN-based platforms with Au-Ag alloyed metal layer for surface enhanced Raman scattering
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10.1063/1.4769106
/content/aip/journal/jap/112/11/10.1063/1.4769106
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/11/10.1063/1.4769106
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Figures

Image of FIG. 1.
FIG. 1.

SEM images of GaN platforms after KSO-D photo-etching (a) and etching in hot KOH aqueous solution (d). The same surfaces after sputtering of the 70/30% Au-Ag alloy (b),(e) and after subsequent de-alloying for 24 h (c), (f). The samples are tilted by 45°.

Image of FIG. 2.
FIG. 2.

SEM images of 70/30 Au-Ag flat layers after etching in HNO3 (de-alloying) up to 24 h. The markers represent 50 nm.

Image of FIG. 3.
FIG. 3.

SEM images of 50/50 Au-Ag flat layers after etching in HNO3 (de-alloying) up to 24 h. The markers represent 50 nm.

Image of FIG. 4.
FIG. 4.

Dependence on de-alloying time in nitric acid on at. % of silver in 70/30 and 50/50 Au/Ag layers.

Image of FIG. 5.
FIG. 5.

SERS spectra of p-MBA on the 70/30 Au-Ag alloy deposited on GaN substrates: (1) as-grown and with nano-pits (EF = 102), (2) as-grown, etched for 24 h (EF = 2.3 × 103), (3) bunches of nano-pillars (EF = 1.4 × 105), and (4) bunches with nano-pillars etched for 24 h (EF = 1.5 × 107).

Image of FIG. 6.
FIG. 6.

Enhancement factor measured for p-MBA on 70/30 and 50/50 Au-Ag alloys deposited on GaN substrates with bunches of nano-pillars and etched (de-alloyed) up to 24 h.

Image of FIG. 7.
FIG. 7.

SERS spectra of p-MBA on pure gold (1) and 50/50 Au-Ag alloy (2), (3) deposited on GaN substrates with bunches of nano-pillars. Samples 1 and 2 not etched, sample 3 de-alloyed for 24 h. Sample (1) EF = 1.2 × 103, (2) EF = 3 × 104, (3) EF = 4 × 106.

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/content/aip/journal/jap/112/11/10.1063/1.4769106
2012-12-12
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: GaN-based platforms with Au-Ag alloyed metal layer for surface enhanced Raman scattering
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/11/10.1063/1.4769106
10.1063/1.4769106
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