Limits...
Tracing temperature in a nanometer size region in a picosecond time period.

Nakajima K, Kitayama T, Hayashi H, Matsuda M, Sataka M, Tsujimoto M, Toulemonde M, Bouffard S, Kimura K - Sci Rep (2015)

Bottom Line: This ultrafast local heating result in formation of nanostructures, which provide a number of potential applications in nanotechnologies.Here, we propose a novel method for tracing temperature in a nanometer region in a picosecond time period by utilizing desorption of gold nanoparticles around the ion impact position.The feasibility is examined by comparing with the temperature evolution predicted by a theoretical model.

View Article: PubMed Central - PubMed

Affiliation: Department of Micro Engineering, Kyoto University, Kyoto 615-8540, Japan.

ABSTRACT
Irradiation of materials with either swift heavy ions or slow highly charged ions leads to ultrafast heating on a timescale of several picosecond in a region of several nanometer. This ultrafast local heating result in formation of nanostructures, which provide a number of potential applications in nanotechnologies. These nanostructures are believed to be formed when the local temperature rises beyond the melting or boiling point of the material. Conventional techniques, however, are not applicable to measure temperature in such a localized region in a short time period. Here, we propose a novel method for tracing temperature in a nanometer region in a picosecond time period by utilizing desorption of gold nanoparticles around the ion impact position. The feasibility is examined by comparing with the temperature evolution predicted by a theoretical model.

No MeSH data available.


Size distributions of gold nanoparticles deposited on a-SiO2 (closed circles) and a-SiN (open circles).The lines show the results of Gaussian fitting.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4543984&req=5

f2: Size distributions of gold nanoparticles deposited on a-SiO2 (closed circles) and a-SiN (open circles).The lines show the results of Gaussian fitting.

Mentions: Figure 1(a) shows an example of TEM bright field images of a gold-deposited amorphous SiO2 (a-SiO2) film (thickness 20 nm) observed before irradiation. There are many gold nanoparticles formed by the gold vapor deposition. The areal density, N, of these nanoparticles was measured to be 1.9 × 1012  particles/cm2. The size distribution of these nanoparticles was derived from the observed TEM images and shown by closed circles in Fig. 2. The distribution shows a Gaussian-like well-defined peak with a peak radius of 1.0 nm and a width of 0.9 nm. A similar size distribution with a peak radius of 2.2 nm and a width of 1.6 nm was also observed for the gold nanoparticles deposited on amorphous SiN (a-SiN) films (thickness 30 nm) as shown by open circles in Fig. 2. The size difference between a-SiO2 and a-SiN is attributed to the smaller diffusivity of gold adatoms on a-SiO2 surfaces compared to a-SiN.


Tracing temperature in a nanometer size region in a picosecond time period.

Nakajima K, Kitayama T, Hayashi H, Matsuda M, Sataka M, Tsujimoto M, Toulemonde M, Bouffard S, Kimura K - Sci Rep (2015)

Size distributions of gold nanoparticles deposited on a-SiO2 (closed circles) and a-SiN (open circles).The lines show the results of Gaussian fitting.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4543984&req=5

f2: Size distributions of gold nanoparticles deposited on a-SiO2 (closed circles) and a-SiN (open circles).The lines show the results of Gaussian fitting.
Mentions: Figure 1(a) shows an example of TEM bright field images of a gold-deposited amorphous SiO2 (a-SiO2) film (thickness 20 nm) observed before irradiation. There are many gold nanoparticles formed by the gold vapor deposition. The areal density, N, of these nanoparticles was measured to be 1.9 × 1012  particles/cm2. The size distribution of these nanoparticles was derived from the observed TEM images and shown by closed circles in Fig. 2. The distribution shows a Gaussian-like well-defined peak with a peak radius of 1.0 nm and a width of 0.9 nm. A similar size distribution with a peak radius of 2.2 nm and a width of 1.6 nm was also observed for the gold nanoparticles deposited on amorphous SiN (a-SiN) films (thickness 30 nm) as shown by open circles in Fig. 2. The size difference between a-SiO2 and a-SiN is attributed to the smaller diffusivity of gold adatoms on a-SiO2 surfaces compared to a-SiN.

Bottom Line: This ultrafast local heating result in formation of nanostructures, which provide a number of potential applications in nanotechnologies.Here, we propose a novel method for tracing temperature in a nanometer region in a picosecond time period by utilizing desorption of gold nanoparticles around the ion impact position.The feasibility is examined by comparing with the temperature evolution predicted by a theoretical model.

View Article: PubMed Central - PubMed

Affiliation: Department of Micro Engineering, Kyoto University, Kyoto 615-8540, Japan.

ABSTRACT
Irradiation of materials with either swift heavy ions or slow highly charged ions leads to ultrafast heating on a timescale of several picosecond in a region of several nanometer. This ultrafast local heating result in formation of nanostructures, which provide a number of potential applications in nanotechnologies. These nanostructures are believed to be formed when the local temperature rises beyond the melting or boiling point of the material. Conventional techniques, however, are not applicable to measure temperature in such a localized region in a short time period. Here, we propose a novel method for tracing temperature in a nanometer region in a picosecond time period by utilizing desorption of gold nanoparticles around the ion impact position. The feasibility is examined by comparing with the temperature evolution predicted by a theoretical model.

No MeSH data available.