Assembly of hybrid oligonucleotide modified gold (Au) and alloy nanoparticles building blocks.
The alloy-based hybrid materials with macroscopic network arrays were developed by AuAg/Au and AuAgPd/Au nanoparticle composites through oligonucleotides hybridization. AuAg/Au and AuAgPd/Au exhibited distinct organization. The morphology of AuAg/Au conjugation assembled mainly as compact aggregates while AuAgPd/Au hybrid conjugated into the loosen network assemblies. The dehybridization temperatures were studied as a function of molar ratio of alloy/Au. It was found that higher alloy/gold molar ratio led to stronger hybridization for alloy/gold composite, accompanied with increased melting temperature. These results could be interpreted in terms of more alloy nanoparticles bound to a Au particle when the molar ratio of alloy/gold increased. The thermal analysis also showed that AuAg/Au exhibited higher dehybridization temperature. A modified model describing the dehybridization probability of an intact Au/alloy aggregate was performed to support the dehybridization temperature increased with increasing alloy/Au molar ratio. As to more oligonucleotides carried by AuAg (4.9 +/- 1.9 nm) than by AuAgPd (4.4 +/- 1.5 nm) due to larger size in AuAg, the efficient hybridization could result in higher dehybridization temperature in AuAg/Au.
Kuo
Yu-Ching
YC
Department of Chemistry and Center for Micro/Nano Technology Research, National Cheng Kung University, Tainan 701, Taiwan.
Jen
Chun-Ping
CP
Chen
Yu-Hung
YH
Su
Chia-Hao
CH
Tsai
Shu-Hui
SH
Yeh
Chen-Sheng
CS
D000497:Alloys / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D007700:Kinetics; D008854:Microscopy, Electron; D049329:Nanostructures / Q000737:chemistry; D009841:Oligonucleotides / Q000737:chemistry*; D012834:Silver / Q000737:chemistry; D013053:Spectrophotometry
D000497:Alloys; D009841:Oligonucleotides; D012834:Silver; D006046:Gold