How are gold nanorods made?

Synthesis of gold nanoparticles developed a synthetic method for creating AuNPs in 1951 by treating hydrogen tetrachloroaurate (HAuCl4) with citric acid in boiling water, where the citrate acts as both reducing and stabilizing agent (Scheme 2B).

How is nanorods formed?

Nanorods are produced by direct chemical synthesis. A combination of ligands act as shape control agents and bond to different facets of the nanorod with different strengths. This allows different faces of the nanorod to grow at different rates, producing an elongated object.

What are gold nanorods?

Gold nanorods are microscopic gold nanoparticles that are have been elongated to resemble rods, rather than the traditional spherical shape.

What are gold nanorods used for?

Gold nanorods are widely used for photothermal therapy technologies, where near-infrared (NIR) lasers selectively irradiate nanorods at their resonant wavelengths to induce local heating without causing damage to surrounding (IR transparent) tissues.

What is turkevich method?

The Turkevich method is a relatively simple and reproducible technique for the synthesis of spherical particles between 10 nm to 30 nm. However, the particles become less spherical, the size distribution becomes broader, and the results were less reproducible for the synthesis of AuNP above 30 nm size.

What is seed mediated method?

The seed-mediated process is fundamentally a wet chemical route and thus changes to reaction conditions including temperature and reactant concentrations should be facile routes to controlling product. For example, Smith et al. have demonstrated that trace contaminates such as iodide prevent nanorod formation [22.

What are nanorods and nanowires?

In nanotechnology, nanorods are one morphology of nanoscale objects. Each of their dimensions range from 1–100 nm. Whereas, A nanowire is a nanostructure, with the diameter of the order of a nanometer (10−9meters). It can also be defined as the ratio of the length to width being greater than 1000.

Why are nanowires important?

Some nanowires are very good conductors or semiconductors, and their miniscule size means that manufacturers could fit millions more transistors on a single microprocessor. As a result, computer speed would increase dramatically. Nanowires may play an important role in the field of quantum computers.

What are nanorods made of?

Nanorods are nanostructures that are the object of fundamental and applied research. They may be prepared from carbon, gold, zinc oxide, and many other materials. They are bigger than individual atoms (measured in angstroms, 1 Å = 10−10 m) and also than small molecules.

How is the synthesis of gold nanoparticles carried out?

The synthesis is carried out in a two-electrode electrochemical cell. The gold plate serves as the anode, whereas the cathode is a platinum electrode.

What are the applications of nanorods in chemistry?

Gold nanorods-based materials may play a crucial role in the development of rapid and sensitive methods for solving the challenge tasks of modern analytical chemistry – monitoring of the environment, production quality control, determination of biologically active compounds.

Are non-spherical gold nanoparticles suitable for chemical sensing?

Gold nanoparticles are widely proposed in chemical sensing applications. Various types of sensors utilizing them have been developed [ 1, 2 ]. Recently, the non-spherical nanoparticles, such as gold nanorods (AuNRs) [ [3], [4], [5] ], nanoprisms [ 6 ], nanoporous gold [ 7 ], have attracted special attention, becoming a hotspot in the nanoscience.

Do non-spherical gold nanoparticles have surface plasmon resonance bands?

Tréguer-Delapierre et al. summarized general information on non-spherical gold nanoparticles, including data on characteristic positions of surface plasmon resonance (SPR) bands for the most common types of nanoparticles ( Fig. 1) [ 8 ]. It should be noted that only AuNRs are characterized by two ranges in the spectrum.