Electrochemical Fabrication of Nanostructures on Porous Silicon for Biochemical Sensing Platforms.
We present a method for the electrochemical patterning of gold nanoparticles (AuNPs) or silver nanoparticles (AgNPs) on porous silicon, and explore their applications in: (1) the quantitative analysis of hydroxylamine as a chemical sensing electrode and (2) as a highly sensitive surface-enhanced Raman spectroscopy (SERS) substrate for Rhodamine 6G. For hydroxylamine detection, AuNPs-porous silicon can enhance the electrochemical oxidation of hydroxylamine. The current changed linearly for concentrations ranging from 100 μM to 1.32 mM (R(2) = 0.995), and the detection limit was determined to be as low as 55 μM. When used as SERS substrates, these materials also showed that nanoparticles decorated on porous silicon substrates have more SERS hot spots than those decorated on crystalline silicon substrates, resulting in a larger SERS signal. Moreover, AgNPs-porous silicon provided five-times higher signal compared to AuNPs-porous silicon. From these results, we expect that nanoparticles decorated on porous silicon substrates can be used in various types of biochemical sensing platforms.
Department of Bionano Engineering, Hanyang University.
Euna
E
Ko
Joonki
J
Hwang
Ji Hye
JH
Kim
Joo Heon
JH
Lee
Sung Hwan
SH
Lee
Van-Khue
VK
Tran
Woo Sung
WS
Chung
Chan Ho
CH
Park
Jaebum
J
Choo
Gi Hun
GH
Seong
D004563:Electrochemistry; D006046:Gold / Q000737:chemistry; D019811:Hydroxylamine / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D016062:Porosity; D012825:Silicon / Q000737:chemistry*; D012834:Silver / Q000737:chemistry; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*
D019811:Hydroxylamine; D012834:Silver; D006046:Gold; D012825:Silicon