4. One-Dimensional (1-D)
Needle-like shape structure
Can be broadly divided into 3
category:
Nanorods
Nanotubes
Nanowires
Long Gold Nanorods
Source: nanoseedz.com
5. NANOTUBES
Nanotubes are tiny cylindrical structures
with nanometer-scale diameters and
micrometer-scale lengths. They can be
made of various materials, including
carbon, boron nitride, and metals. Carbon
nanotubes (CNTs) are the most well-
known type of nanotubes, and they are
made of rolled-up graphene sheets
Carbon nanotubes
source ; nanotechz.com
8. NANORODS
Similar to nanowires but
nanorods have low aspect
ratio as and generally < 5
micro meter in length
Due to which shows
different properties
Long Gold Nanorods
Source: nanoseedz.com
9.
10. Nanowires
One-dimensional
nanostructures that
have a large length
to diameter aspect
ratios, Distinction
can be done on the
basic of its
mechanical
properties.
Nanorods Nanotubes
Similar to nanowires
but nanorods have
low aspect ratio as
and generally < 5
micro meter in length
Due to which shows
different properties.
Are hollow tubes or
bamboo like
structure and can be
singled or multi
walled.
11. Nanorods and Nanowires
Nanorods - low aspect ratio as and generally < 5
micro meter in length.
Nanowires - have a large length to diameter aspect
ratios.
Due to which shows different properties.
12. Nanowires
One-dimensional
nanostructures that
have a large length
to diameter aspect
ratios, Distinction
can be done on the
basic of its
mechanical
properties.
Nanorods Nanotubes
Similar to nanowires
but nanorods have
low aspect ratio as
and generally < 5
micro meter in length
Due to which shows
different properties.
Are hollow tubes or
bamboo like
structure and can be
singled or multi
walled.
13. Synthesis
Various nanorods have been extensively studied such
as carbon nanorods, ZnO nanorods, gold nanorods and
magnetic nanorods. Recently, various techniques have
been proposed for synthesizing the nanorods.
For different type of nanorods different technique and
method is being used to synthesis these rod.
14. Synthesis
● Physical methods such as vapor deposition and laser
ablation
● Chemical methods such as chemical vapor deposition,
sol-gel and hydrothermal synthesis
● Biological methods such as bacteria-assisted synthesis
and template-assisted synthesis.
The choice of synthesis method depends on several factors
such as the type of material being synthesized, the desired
size and shape of the nanorods, and the intended application
of the nanorods
16. ZnO nanorods Synthesis
High oriented array of ZnO nanorods can be produced via
various chemical, electrochemical and physical deposition
techniques such as
● Chemical vapor deposition (CVD) or metal organic CVD
● Vapor-liquid-solid (VLS) growth
● Electrochemical deposition (ED)
● Hydrothermal approaches.
17. A great deal of attention has been focused on the study of
synthesizing the ZnO nanorods via VLS method.
● Vapour liquid solid growth
18. ● Gold (Au) nanoparticles are used as catalyst in order to
promoting the ZnO nanorods formation
● It required high growth temperature > 900°C in order to dissolving
the Zn vapor into the Au catalyst
● Zn precipitates out from the droplet and further oxidized as ZnO
nanorods grow.
20. Applications Of ZnO nanorods
● Gas Sensor
ZnO functions as a gas sensitive
material due to its electrical conductivity that
can be dramatically affected by the
adsorption or desorption of gas molecules on
its surface [ZnO functions as a gas sensitive
material due to its electrical conductivity that
can be dramatically affected by the
adsorption or desorption of gas molecules on
its surface.
There are many gasses that can be detected
by ZnO nanowires, such as NO , NO2 , CO ,
NH3, H2, O2, and ethanol
Response curve of a ZnO gas sensor exposed
to 10 ppb NO2 gas at 250°C
21. Applications Of ZnO nanorods
● Energy production
The unique shape of ZnO
nanorods enhances their light-
absorbing properties and provides
a large surface area for efficient
electron transport. As a result, ZnO
nanorod-based solar cells have
shown improved photovoltaic
performance compared to
traditional planar ZnO solar cells.
22. Applications Of Gold Nanorods
Gold nanorods have a wide application in medical fields
23. Applications Of Gold Nanorods
Drug delivery: Gold
nanorods can be
functionalized with drugs
and used as carriers to
target specific cells or
tissues, improving the
efficacy of the drugs.
24. Applications Of Gold Nanorods
Photothermal therapy:
Gold nanorods can be
used in cancer therapy by
converting light energy
into heat to kill cancer
cells.
25. Applications Of Gold Nanorods
Catalysis: Gold nanorods have been shown to be effective
catalysts in various chemical reactions, and they have the
potential to be used in applications such as environmental
remediation and energy conversion.
Sensors: Gold nanorods can be used as highly sensitive and
selective sensors for a variety of analytes, including heavy
metals, pathogens, and small molecules.