Shape Elongation of Nanoparticles Induced by Swift Heavy Ion Irradiation

Chen, Feng; Amekura, H.; Jia, Yuechen

doi:10.1007/978-981-15-4607-5_5

Springer Series in Optical Sciences

2020

DOI: 10.1007/978-981-15-4607-5_5

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Shape Elongation of Nanoparticles Induced by Swift Heavy Ion Irradiation

Feng Chen

H. Amekura

Yuechen Jia

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Cited by 4 publications

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“…See for example, Refs. 14,33,34 for more complete reviews on the elongation phenomenon.Atomistic simulations performed by several groups have shown that NPs change shape on impacts 9,28,29,35 . On the other hand, the mere reproduction of the effect in the simulation does not unambiguously identify the underlying mechanism, and the conclusions drawn from MD simulations appear contradictory.…”

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confidence: 99%

Insights into nanoparticle shape transformation by energetic ions

Leino

Jantunen

Mota‐Santiago

et al. 2023

Sci Rep

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Shape modification of embedded nanoparticles can be achieved by means of swift heavy ion irradiation. During irradiation, the particles elongate and align with the direction of the ion beam, presumably due to nanometer-scale phase transitions induced by individual ion impacts. However, the details of this transformation are not fully understood. The shape of metal nanoparticles embedded in dielectric matrices defines the non-linear optical properties of the composite material. Therefore, understanding the transformation process better is beneficial for producing materials with the desired optical properties. We study the elongation mechanism of gold nanoparticles using atomistic simulations. Here we focus on long-timescale processes and adhesion between the nanoparticle and the matrix. Without the necessity of ad-hoc assumptions used earlier, our simulations show that, due to adhesion with the oxide, the nanoparticles can grow in aspect ratio while in the molten state even after silicon dioxide solidifies. Moreover, they demonstrate the active role of the matrix: Only explicit simulations of ion impacts around the embedded nanoparticle provide the mechanism for continuous elongation up to experimental values of aspect ratio. Experimental transmission electron microscopy micrographs of nanoparticles after high-fluence irradiation support the simulations. The elongated nanoparticles in experiments and their interface structures with silica, as characterized by the micrographs, are consistent with the simulations. These findings bring ion beam technology forward as a precise tool for shaping embedded nanostructures for various optical applications.

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confidence: 99%

Insights into nanoparticle shape transformation by energetic ions

Leino

Jantunen

Mota‐Santiago

et al. 2023

Sci Rep

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Enhanced NO₂ Gas Sensing in Nanocrystalline MoS₂ via Swift Heavy Ion Irradiation: An Experimental and DFT Study

Kushwaha,

Bharti,

Sharma

et al. 2024

ACS Sens.

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Nanostructured transition metal dichalcogenides (TMDs) like MoS 2 hold promise for gas sensing applications due to their exceptional properties. However, limitations exist in maximizing sensor performance, such as limited active sites for gas interaction and sluggish response/recovery times. This study explores swift heavy ion (SHI) irradiation as a strategy to address these challenges in MoS 2 -based NO 2 gas sensors. MoS 2 nanoflakes were fabricated and subsequently irradiated with 120 MeV silver (Ag) ions to induce structural and morphological modifications. Characterization techniques confirmed the formation of Mo and S vacancies within the MoS 2 lattice due to irradiation. Significantly, SHI irradiation resulted in a remarkable enhancement of approximately 3 times improvement in sensing response compared to pristine MoS 2 sensors. Additionally, the irradiated sensors exhibit substantial improvements in both response and recovery times for NO 2 detection. SHI irradiation resulted in the formation of self-affine nanostructures and increased grain fragmentation as fluence rises. This enhanced surface area is hypothesized to promote gas-sensor response. To gain deeper insights into the underlying mechanism, first-principles calculations were employed. These calculations suggest that electron transfer occurs from the MoS 2 surface to the NO 2 molecule during interaction. Furthermore, the irradiation-induced vacancies facilitate stronger NO 2 adsorption on the MoS 2 surface compared to the pristine sample. This work demonstrates the effectiveness of SHI irradiation in engineering defects within MoS 2 nanoflakes, leading to significantly improved NO 2 gas-sensing performance. This approach offers a promising avenue for developing next-generation TMD-based gas sensors with enhanced sensitivity, response times, and stability.

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Ion tracks in silicon formed by much lower energy deposition than the track formation threshold

Amekura

Toulemonde

Narumi

et al. 2021

Sci Rep

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Damaged regions of cylindrical shapes called ion tracks, typically in nano-meters wide and tens micro-meters long, are formed along the ion trajectories in many insulators, when high energy ions in the electronic stopping regime are injected. In most cases, the ion tracks were assumed as consequences of dense electronic energy deposition from the high energy ions, except some cases where the synergy effect with the nuclear energy deposition plays an important role. In crystalline Si (c-Si), no tracks have been observed with any monomer ions up to GeV. Tracks are formed in c-Si under 40 MeV fullerene (C60) cluster ion irradiation, which provides much higher energy deposition than monomer ions. The track diameter decreases with decreasing the ion energy until they disappear at an extrapolated value of ~ 17 MeV. However, here we report the track formation of 10 nm in diameter under C60 ion irradiation of 6 MeV, i.e., much lower than the extrapolated threshold. The diameters of 10 nm were comparable to those under 40 MeV C60 irradiation. Furthermore, the tracks formed by 6 MeV C60 irradiation consisted of damaged crystalline, while those formed by 40 MeV C60 irradiation were amorphous. The track formation was observed down to 1 MeV and probably lower with decreasing the track diameters. The track lengths were much shorter than those expected from the drop of Se below the threshold. These track formations at such low energies cannot be explained by the conventional purely electronic energy deposition mechanism, indicating another origin, e.g., the synergy effect between the electronic and nuclear energy depositions, or dual transitions of transient melting and boiling.

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Shape Elongation of Nanoparticles Induced by Swift Heavy Ion Irradiation

Cited by 4 publications

References 94 publications

Insights into nanoparticle shape transformation by energetic ions

Insights into nanoparticle shape transformation by energetic ions

Enhanced NO₂ Gas Sensing in Nanocrystalline MoS₂ via Swift Heavy Ion Irradiation: An Experimental and DFT Study

Ion tracks in silicon formed by much lower energy deposition than the track formation threshold

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Shape Elongation of Nanoparticles Induced by Swift Heavy Ion Irradiation

Cited by 4 publications

References 94 publications

Insights into nanoparticle shape transformation by energetic ions

Insights into nanoparticle shape transformation by energetic ions

Enhanced NO2 Gas Sensing in Nanocrystalline MoS2 via Swift Heavy Ion Irradiation: An Experimental and DFT Study

Ion tracks in silicon formed by much lower energy deposition than the track formation threshold

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Enhanced NO₂ Gas Sensing in Nanocrystalline MoS₂ via Swift Heavy Ion Irradiation: An Experimental and DFT Study