Laser-Processed Nanosilicon: A Multifunctional Nanomaterial for Energy and Healthcare

Kabashin, Andrei V.; Singh, Ajay; Swihart, Mark T.; Zavestovskaya, I. N.; Prasad, Paras N.

doi:10.1021/acsnano.9b04610

Cited by 118 publications

(68 citation statements)

References 217 publications

(562 reference statements)

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“…[ 1–5 ] Besides rather limited dangling‐bond absorption of electromagnetic waves in amorphous nanosilicon, broadly variable free‐carrier absorption (free‐carrier concentration ≈10 17 cm −3 ) [ 4 ] in controllably doped silicon has recently brought another important modality to Si NPs, related to space‐selective in situ anti‐cancer hyperthermia‐based therapies via near‐ and mid‐infrared (IR) laser, or radiofrequency (RF) Joule heating. [ 4,6 ] However, to date strong Si–NP doping was realized only via minor introduction of gold, [ 7 ] since Si is rather immiscible material. [ 8 ]…”

Section: Figurementioning

confidence: 99%

Multifunctional Sulfur‐Hyperdoped Silicon Nanoparticles with Engineered Mid‐Infrared Sulfur‐Impurity and Free‐Carrier Absorption

Nastulyavichus

Сараева

Rudenko

et al. 2020

Part & Part Syst Charact

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rather limited dangling-bond absorption of electromagnetic waves in amorphous nanosilicon, broadly variable free-carrier absorption (free-carrier concentration ≈10 17 cm −3 ) [4] in controllably doped silicon has recently brought another important modality to Si NPs, related to space-selective in situ anti-cancer hyperthermiabased therapies via near-and mid-infrared (IR) laser, or radiofrequency (RF) Joule heating. [4,6] However, to date strong Si-NP doping was realized only via minor introduction of gold, [7] since Si is rather immiscible material. [8] In contrast, n-hyperdoped Si was actively studied for the last decade as a material platform, supporting fabrication of mid-IR sensitizers for solar cells, [9] broadband active media for thin-film photovoltaics, [1] broad-band mid-IR nightvision and imaging devices for novel promising and emerging applications. The currently achieved strong (≈10 3 -10 4 cm −1 ) smooth [10][11][12][13][14] or band-engineered [15,16] mid-IR absorption in sulfur-(or selenium and tellurium [12] ) doped Si was suggested for raising solar-cell efficiency up to 49% through efficient harvesting of near-and mid-IR solar radiation. [17] Besides the donor-based band-to-band absorption, considerable free-carrier absorption via thermal ionization of shallow donor states was also reported in such Si nanoparticles (NPs), which are innovative promising light-harvesting components of thin-film solar cells and key-enabling biocompatible theranostic elements of infrared-laser and radiofrequency hyperthermia-based therapies of cancer cells in tumors and metastases, are significantly advanced in their near/mid-infrared band-to-band and free-carrier absorption via donor sulfur-hyperdoping during high-throughput facile femtosecond-laser ablative production in liquid carbon disulfide. High-resolution transmission electron microscopy and Raman microscopy reveal their mixed nanocrystalline/ amorphous structure, enabling the extraordinary sulfur content of a few atomic percents and very minor surface oxidation/carbonization characterized by energy-dispersive X-ray spectro scopy and X-ray photoelectron spectroscopy. A 200-nm thick layer of the nanoparticles exhibits near−mid-infrared absorbance, comparable to that of the initial 380-micron thick n-doped Si wafer (phosphordopant concentration ≈10 15 cm −3 ), with the corresponding extinction coefficient for the hyperdoped NPs being 4-7 orders higher over the broadband spectral range of 1-25 micrometers. Such ultimate, but potentially tunable mid-IR structured, multi-band absorption of various sulfur-impurity clusters and smooth free-carrier absorption are break through advances in mid-infrared (mid-IR) laser and radiofrequency (RF) hyperthermia-based therapies, as envisioned in the RF-heating tests, and in fabrication of higher-efficiency thin-film and bulk photovoltaic devices with ultra-broad (UV−mid-IR) spectral response.

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Section: Figurementioning

confidence: 99%

Multifunctional Sulfur‐Hyperdoped Silicon Nanoparticles with Engineered Mid‐Infrared Sulfur‐Impurity and Free‐Carrier Absorption

Nastulyavichus

Сараева

Rudenko

et al. 2020

Part & Part Syst Charact

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“…As an example, we recently showed that the technique of femtosecond laser ablation in liquids can be used for the fabrication of a variety of ultrapure, biologically-friendly nanomaterials, including gold NPs [16,[18][19][20][21][22], titanium nitride (TiN) NPs [23], silicon NPs [24][25][26][27] and organic polymer NPs [28]. In many cases, such nanoparticles can provide superior properties for catalytic [20], energy and biomedical [29,30] applications, compared to nanomaterials synthesized by conventional chemical methods, and other methods.…”

Section: Sm Oxide Powder and Preparation Of Target For Ablationmentioning

confidence: 99%

Laser-Ablative Synthesis of Isotope-Enriched Samarium Oxide Nanoparticles for Nuclear Nanomedicine

et al. 2019

Self Cite

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Nuclear nanomedicine is an emerging field, which utilizes nanoformulations of nuclear agents to increase their local concentration at targeted sites for a more effective nuclear therapy at a considerably reduced radiation dosage. This field needs the development of methods for controlled fabrication of nuclear agents carrying nanoparticles with low polydispersity and with high colloidal stability in aqueous dispersions. In this paper, we apply methods of femtosecond (fs) laser ablation in deionized water to fabricate stable aqueous dispersion of 152 Sm-enriched samarium oxide nanoparticles (NPs), which can capture neutrons to become 153 Sm beta-emitters for nuclear therapy. We show that direct ablation of a 152 Sm-enriched samarium oxide target leads to widely size-and shape-dispersed populations of NPs with low colloidal stability. However, by applying a second fs laser fragmentation step to the dispersion of initially formed colloids, we achieve full homogenization of NPs size characteristics, while keeping the same composition. We also demonstrate the possibility for wide-range tuning of the mean size of Sm-based NPs by varying laser energy during the ablation or fragmentation step. The final product presents dispersed solutions of samarium oxide NPs with relatively narrow size distribution, having spherical shape, a controlled mean size between 7 and 70 nm and high colloidal stability. The formed NPs can also be of importance for catalytic and biomedical applications.

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“…In particular, nanoparticles generated by laser synthesis and processing of colloids (LSPC) [ 32 ] are suitable for colloidal supporting since they do not have any surfactants and often have enhanced adsorption (supporting) behavior on micropowders. Since LSPC is a versatile, [ 33,34 ] scalable, [ 35,36 ] and economically feasible [ 37 ] method to generate colloids, it is compatible with the production of powder for additive manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Seasoning: Giving Color to Desktop Laser 3D Printed Polymers by Highly Dispersed Nanoparticles

Hupfeld

Wegner

Blanke

et al. 2020

Advanced Optical Materials

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Material development is key for continuing the exponential growth in the field of 3D printing. However, 3D printing of polymers by laser powder bed fusion (PBF‐LB) still is limited to a few polymer powder materials, which restricts the range of applications. Tailoring the chemical, rheological, mechanical, or optical properties of the feedstock powder to the requirements of the laser printing process poses a significant challenge. In order to meet global trends in the commercialization of desktop 3D printers, the use of inexpensive and compact diode lasers for PBF‐LB in the visible or near‐infrared range is highly desired. However, at present, only black objects can be printed by desktop laser printers since only commercial carbon black‐based composite powders meet their laser absorption requirements. In this study, a route for tuning the absorption properties of thermoplastic polyurethane polymers and incorporating color into printed objects by using minute amounts (i.e., 0.01 vol%) of highly dispersed plasmonic silver nanoparticles is reported, presenting a new way for colored parts to be produced through laser 3D printing.

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Laser-Processed Nanosilicon: A Multifunctional Nanomaterial for Energy and Healthcare

Cited by 118 publications

References 217 publications

Multifunctional Sulfur‐Hyperdoped Silicon Nanoparticles with Engineered Mid‐Infrared Sulfur‐Impurity and Free‐Carrier Absorption

Multifunctional Sulfur‐Hyperdoped Silicon Nanoparticles with Engineered Mid‐Infrared Sulfur‐Impurity and Free‐Carrier Absorption

Laser-Ablative Synthesis of Isotope-Enriched Samarium Oxide Nanoparticles for Nuclear Nanomedicine

Plasmonic Seasoning: Giving Color to Desktop Laser 3D Printed Polymers by Highly Dispersed Nanoparticles

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