Temperature Dependence of the Emission Spectrum of Silicon Nanoparticles in Acetone and Isopropanol Solvents

Al-Chaar, Ghassan; Hoang, Tuan; Dowds, Dominick; Ford, Kyle Douglas; Carlson, Thomas A.; Marsh, Charles

doi:10.1007/s10876-013-0645-5

Cited by 2 publications

(2 citation statements)

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“…35 The sensors constructed with silicon nanoparticles can detect temperatures ranging from 0 to 60 °C. 36 Though some of the sensors fabricated with inorganic materials showed a wider range of temperature sensing, they require ultraviolet (UV) light to read the results. [79][80][81] Thus, these issues limit their usage in biological applications.…”

Section: Discussionmentioning

confidence: 99%

“…35 Sensors developed with QDs and silicon nanoparticles can sense temperatures of 20–40 °C and 0–60 °C, respectively. 36 Though some of the fluorescent molecules were prepared with inorganic materials, their temperature could range from 50 to 300 K; however, they need to be excited by ultraviolet light, 37 which might lead to a strong background and toxicity. Thus, the aforementioned materials have some drawbacks such as a small temperature range, systematic errors, bio-toxicity, environmental contamination, and unstable optical characteristics in various circumstances.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of a fluorescent polymeric nano-thermometer: dynamic monitoring of 3D temperature distribution in co-cultured tumor spheroids

Kumar

Goudar

Kaladharan

et al. 2023

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a fluorescent polymeric nano-thermometer: dynamic monitoring of 3D temperature distribution in co-cultured tumor spheroids

Kumar

Goudar

Kaladharan

et al. 2023

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Dynamic transition of nanosilicon from indirect to direct-like nature by strain-induced structural relaxation

et al. 2021

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Silicon nanoclusters exhibit light emission with direct-like ns–µs time dynamics; however, they show variable synthesis and structure, optical, and electronic characteristics. The widely adopted model is a core–shell in which the core is an indirect tetrahedral absorbing Si phase, while the shell is a network of re-structured direct-like H–Si–Si–H molecular emitting phases, with the two connected via back Si–Si tetrahedral bonds, exhibiting a potential barrier, which significantly hinders emission. We carried out first-principles atomistic computations of a 1-nm Si nanoparticle to discern the variabilities. Enlarging the network reduces the potential barrier monotonically to a finite limit not sufficient for strong emission to proceed while inducing a path to quenching of emission via a conical crossing between the excited and ground states. However, enlarging the network is found to induce strain and structural instability, which causes structural relaxation that creates a direct path for emission without crossing the barrier. Following emission, the particle relaxes back to the indirect ground structure, which completes the cycle. The results also confirm the pivotal role of HF/H2O2 etching in synthesizing the core–shells and affording control over the molecular network. Measurements using synchrotron and laboratory UV excitation of thin films of 1-nm Si particles show good agreement with the simulation results. It is plausible that the relaxation is behind the stimulated emission, gain, or microscopic laser action, reported earlier in macroscopic distributions of 1- and 3-nm Si nanoparticles.

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Temperature Dependence of the Emission Spectrum of Silicon Nanoparticles in Acetone and Isopropanol Solvents

Cited by 2 publications

References 24 publications

Synthesis and characterization of a fluorescent polymeric nano-thermometer: dynamic monitoring of 3D temperature distribution in co-cultured tumor spheroids

Synthesis and characterization of a fluorescent polymeric nano-thermometer: dynamic monitoring of 3D temperature distribution in co-cultured tumor spheroids

Dynamic transition of nanosilicon from indirect to direct-like nature by strain-induced structural relaxation

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