scholarly journals Introduction to Bioinspired Nanomaterials

2021 ◽  
pp. 1-35
Keyword(s):  
Synthetic Methods ◽  
Metal Nanostructures ◽  
Chemical Route ◽  
Sensor Applications ◽  
Surface Enhanced Raman ◽  
Shape Selective ◽  
Science Community ◽  
Enhanced Raman Scattering ◽  
Bioinspired Nanomaterials ◽  
High Flexibility

Nanomaterials (NMs) developed using biomolecules display numerous advantages which attract the science community to explore them for a wide range of applications. In this line, bio-scaffolds are studied as templates to form nano-bio heterojunctions in the nano confined materials. With the high flexibility of biomediated NMs, it is possible to develop desired size and shape selective NMs. Such bio-based NMs have great benefits in wide areas including catalysis, sensors and energy related applications particularly, electrocatalysis, supercapacitor, batteries etc. The viability of bio-scaffolds in developing metal superstructures makes them better choice in the medicinal fields. This book chapter mainly focused on the advantageous and challenges of bioinspired NMs in the medicinal field, particularly in drug delivery systems. Moreover, the synthetic methods such as enzyme catalyzed wet-chemical route, photo-irradiation and incubation methods were also discussed in detail. Also, this chapter gives a better understanding to the readers about the development of new nano-bio heterojunctions for medicine, energy and environmental fields. Moreover, the morphological features of nano-bio interactions at nanoscale level show predominant activity particularly in Surface Enhanced Raman Scattering (SERS) and sensor applications. With the knowledge gained from this chapter, in futuristic, one can go for the development of new metal nanostructures with different bio-scaffolds such as microorganisms, viruses, DNA and protein to mainstream applications for the medicinal fields.

scholarly journals Fabrication of Highly Rough Ag Nanobud Substrates and Surface-Enhanced Raman Scattering ofλ-DNA Molecules

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Chuyun Deng ◽  
Wanyun Ma ◽  
Jia-Lin Sun
Keyword(s):  
Raman Scattering ◽  
Single Molecule ◽  
Surface Enhanced Raman Scattering ◽  
Silver Nanowire ◽  
Metal Nanostructures ◽  
Dna Molecules ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Raman scattering signals can be enhanced by several orders of magnitude on surface-enhanced Raman scattering (SERS) substrates made from noble metal nanostructures. Some SERS substrates are even able to detect single-molecule Raman signals. A novel silver nanobud (AgNB) substrate with superior SERS activity was fabricated with a solid-state ionics method. The AgNB substrate was formed by tightly collocated unidirectional 100 nm size silver buds, presenting a highly rough surface topography. Distinct SERS signals of singleλ-DNA molecules in water were detected on AgNB substrates. AgNB substrates were compared with disordered silver nanowire (AgNW) substrates manufactured by the same method through the SERS detection ofλ-DNA solutions. This original AgNB substrate provides a reliable approach towards trace analysis of biomacromolecules and promotes the utilization of the SERS technique in biomedical research.

Synthesis and Near-Field Enhancement of Composite Nanoarrays Based on Electrodeposition and in Situ Reaction

NANO ◽  
2021 ◽  
Author(s):  
Jing Wu ◽  
Jiali Shen ◽  
Jinghuai Fang ◽  
Lu Xu
Keyword(s):  
Synergistic Effect ◽  
Raman Scattering ◽  
Surface Enhanced Raman Scattering ◽  
Metal Nanostructures ◽  
Nanoparticle Arrays ◽  
Ag Nanoparticle ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Since the morphology and element composition of metal nanostructures strongly affect the surface plasma oscillation characteristics, it has been widely concerned in surface enhanced Raman scattering (SERS). Herein, we proposed a novel route to fabricate composite Au/Ag nanoparticle arrays with synergistic effect for electromagnetic enhancement. Ag nanoparticles were electrodeposited onto a home-made template with highly ordered bowl-like pits. After a novel method of “confined annealing”, we further achieved well-regulated spherical Ag NP arrays, and the composite Au/Ag nanoparticle arrays were finally obtained via in situ replacement. The fabricated composite nanostructures showed stable and sensitive surface enhanced Raman scattering (SERS) performance mainly due to the synergistic effect and abundant “hot spots”, with the enhancement factor (EF) of [Formula: see text] for crystal violet (CV) molecules. In addition, this simple and effective preparation process greatly improved the uniformity of three-dimensional nanostructures, providing a new idea for further improving the stability of SERS signals.

scholarly journals Synthesis of Flower-like Silver Nanostructures on Silicon and Their Application in Surface-enhanced Raman Scattering

2017 ◽  
Vol 26 (3) ◽  
pp. 241 ◽  
Author(s):  
Kieu Ngoc Minh ◽  
Cao Tuan Anh ◽  
Luong Truc Quynh Ngan ◽  
Le Van Vu ◽  
Dao Tran Cao
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Chemical Deposition ◽  
Surface Enhanced Raman Scattering ◽  
Metal Nanostructures ◽  
Silver Nanostructures ◽  
Low Concentrations ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

To enhance the intensity of surface-enhanced Raman scattering (SERS), production of metal nanostructures with sharp points, lying side by side at the nanometer level plays an extremely important role. In this paper, we report on a manufacturing process in which the silver nanoparticles with the flower-like shape have been fabricated. Such silver nanoparticles have been fabricated by chemical deposition of silver particles on silicon wafers, using a solution of hydrofluoric acid (HF), silver nitrate (AgNO3) and ascorbic acid (AsA) in water, at room temperature. During the manufacturing we found that only when the concentrations of AgNO3 and AsA are appropriate, the flower-like silver nanoparticles will form. Note that while other authors mainly made flower-like silver nanoparticles in the form of suspensions, we have created flower-like silver nanoparticles with cabbage-shape on a silicon surface. The ensembles of flower-like silver nanoparticles above were used as SERS substrates to detect crystal violet (CV) in low concentrations and good results were obtained.

scholarly journals Advanced Nanoporous Anodic Alumina-Based Optical Sensors for Biomedical Applications

2021 ◽  
Vol 3 ◽  
Author(s):  
Silu Feng ◽  
Weiwei Ji
Keyword(s):  
Optical Sensors ◽  
Optical Biosensor ◽  
Nanoporous Structure ◽  
Optical Biosensors ◽  
Formation Mechanisms ◽  
Sensor Applications ◽  
Nanoporous Anodic Alumina ◽  
Reflectometric Interference Spectroscopy ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Close-packed hexagonal array nanopores are widely used both in research and industry. A self-ordered nanoporous structure makes anodic aluminum oxide (AAO) one of the most popular nanomaterials. This paper describes the main formation mechanisms for AAO, the AAO fabrication process, and optical sensor applications. The paper is focused on four types of AAO-based optical biosensor technology: surface-Enhanced Raman Scattering (SERS), surface Plasmon Resonance (SPR), reflectometric Interference Spectroscopy (RIfS), and photoluminescence Spectroscopy (PL). AAO-based optical biosensors feature very good selectivity, specificity, and reusability.

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