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Inter-cluster distance dependence of electrical conduction in nanocluster assembled films of silver: a new paradigm for design of nanostructures.

Bansal C, Praveen SG, Kumaran JT, Chatterjee A - Sci Rep (2015)

Bottom Line: In the intermediate range between the two regions, a very interesting temperature-independent conductivity is seen.Our work provides a new paradigm for design of artificial solid structures composed of nanoclusters.The properties of these nanostructures could be tuned by varying the inter-cluster distances to get the desired properties in the same material.

View Article: PubMed Central - PubMed

Affiliation: School of Physics, University of Hyderabad, Hyderabad 500046, India.

ABSTRACT
The transport properties of films assembled from metal nanoclusters can be significantly different from the metals in their bulk or thin film forms due to quantum confinement effects and several competing energy and length scales. For a film composed of metal nanoclusters as its building blocks, the cluster size and the inter-cluster separation are parameters that can be varied experimentally. Here we show that the electrical conductivity of a film composed of silver nanoclusters can be changed by 9 orders of magnitude as a function of the average inter-cluster separation while keeping the average cluster size same. For inter-cluster separations of 9 nanometres or more the conductivity is insulating type whereas for lesser inter-cluster separations the conductivity behaviour is metallic type with a positive temperature coefficient of resistance. In the intermediate range between the two regions, a very interesting temperature-independent conductivity is seen. Our work provides a new paradigm for design of artificial solid structures composed of nanoclusters. The properties of these nanostructures could be tuned by varying the inter-cluster distances to get the desired properties in the same material.

No MeSH data available.


Related in: MedlinePlus

IV characteristics of the 11 minute deposited film as a function of the light intensity from a halogen lamp.
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f5: IV characteristics of the 11 minute deposited film as a function of the light intensity from a halogen lamp.

Mentions: Photo induced current was also observed for the nanocluster films. Figure 5 shows the measured IV characteristics of a film deposited for 11 minutes as a function of optical power from a halogen lamp. We see a current increase of almost 50 per cent over a very small area of 0.2 mm2. The work function of a metal has been observed to increase with decrease in size18, so the observed current increase cannot be attributed to a photoelectric effect. The increase in current can be attributed to an increase in tunnelling between nanoclusters due to excitation of electrons to higher energy levels and an increased tunnelling probability.


Inter-cluster distance dependence of electrical conduction in nanocluster assembled films of silver: a new paradigm for design of nanostructures.

Bansal C, Praveen SG, Kumaran JT, Chatterjee A - Sci Rep (2015)

IV characteristics of the 11 minute deposited film as a function of the light intensity from a halogen lamp.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4286756&req=5

f5: IV characteristics of the 11 minute deposited film as a function of the light intensity from a halogen lamp.
Mentions: Photo induced current was also observed for the nanocluster films. Figure 5 shows the measured IV characteristics of a film deposited for 11 minutes as a function of optical power from a halogen lamp. We see a current increase of almost 50 per cent over a very small area of 0.2 mm2. The work function of a metal has been observed to increase with decrease in size18, so the observed current increase cannot be attributed to a photoelectric effect. The increase in current can be attributed to an increase in tunnelling between nanoclusters due to excitation of electrons to higher energy levels and an increased tunnelling probability.

Bottom Line: In the intermediate range between the two regions, a very interesting temperature-independent conductivity is seen.Our work provides a new paradigm for design of artificial solid structures composed of nanoclusters.The properties of these nanostructures could be tuned by varying the inter-cluster distances to get the desired properties in the same material.

View Article: PubMed Central - PubMed

Affiliation: School of Physics, University of Hyderabad, Hyderabad 500046, India.

ABSTRACT
The transport properties of films assembled from metal nanoclusters can be significantly different from the metals in their bulk or thin film forms due to quantum confinement effects and several competing energy and length scales. For a film composed of metal nanoclusters as its building blocks, the cluster size and the inter-cluster separation are parameters that can be varied experimentally. Here we show that the electrical conductivity of a film composed of silver nanoclusters can be changed by 9 orders of magnitude as a function of the average inter-cluster separation while keeping the average cluster size same. For inter-cluster separations of 9 nanometres or more the conductivity is insulating type whereas for lesser inter-cluster separations the conductivity behaviour is metallic type with a positive temperature coefficient of resistance. In the intermediate range between the two regions, a very interesting temperature-independent conductivity is seen. Our work provides a new paradigm for design of artificial solid structures composed of nanoclusters. The properties of these nanostructures could be tuned by varying the inter-cluster distances to get the desired properties in the same material.

No MeSH data available.


Related in: MedlinePlus