Silicon-based core–shell nanostructures

Ray, Mallar; Gupta, Sayak Dutta; Hazra, Atrayee

doi:10.4324/9781315153551-11

Cited by 3 publications

(6 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is well-known that light emission from Si nanostructures has attracted immense attention, and different forms of nano-Si have been widely investigated in this regard. However, despite more than two decades of intensive research on light-emitting Si nanostructures, the issue of the light emission mechanism still awaits a consensus. − Albeit the existing controversy, the phenomenon of light emission is very exciting as it opens up the possibility for various applications, particularly in optoelectronics and sensing.…”

Section: Resultsmentioning

confidence: 99%

Quasi-Two-Dimensional Luminescent Silicon Nanosheets

et al. 2018

Self Cite

View full text Add to dashboard Cite

Although predicted to be stable under ambient conditions, the experimental synthesis of silicenethe twodimensional silicon analogue of graphenehas been a great challenge. Here, we report the preparation of scalable quantities of crystalline nanosheets of two-dimensional silicon by simple topochemical exfoliation of layered Zintl phases. The simple process leads to the formation of stacked layers of 2D Si nanosheets which are arbitrarily surface terminated with oxygen, hydrogen, hydroxide, and other ligands. The nanosheets exhibit strong room-temperature photoluminescence, and their overall spectroscopic characteristics closely resemble other forms of silicon nanocrystals. Remarkably, the pelletized nanosheets exhibit significantly high Hall mobility even in the absence of any doping or surface treatment, which is better than the reported values of doped Si nanosystems. Such ensembles of two-dimensional nanosheets of silicon bear the signature of exotic electronic properties and represent important building blocks in two-dimensional electronics along with potential applications in solar cells, next-generation thermoelectric materials, and sensors.

show abstract

Section: Resultsmentioning

confidence: 99%

Quasi-Two-Dimensional Luminescent Silicon Nanosheets

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Yet the exact mechanism of luminescence from Si NPs is still not completely understood. 16,55 We have shown in our previous works that quantum confinement of excitons and surface, interface, and/or defect states (primarily due to oxides) play a combined role in light emission from Si nanostructures. 59−61 In this communication, we refrain from delving into the photophysics of Si NPs and simply point out that our sample is highly luminescent with a quantum yield (QY) (Section S6, Supporting Information) of around 35−40%.…”

Section: Resultsmentioning

confidence: 99%

“…The origin of room-temperature PL in Si NPs has been an active area of research for nearly three decades. Yet the exact mechanism of luminescence from Si NPs is still not completely understood. , We have shown in our previous works that quantum confinement of excitons and surface, interface, and/or defect states (primarily due to oxides) play a combined role in light emission from Si nanostructures. − …”

Section: Resultsmentioning

confidence: 99%

“…Additionally, Si NPs provide a benign alternative compared to the other binary or ternary semiconductor quantum dots. Despite these advantages, light emission from Si NPs is still somewhat controversial and widespread application of luminescent Si NPs has remained largely elusive. − Another key concern about luminescent Si NPs is their stabilitycolloidal Si NPs or the conventional porous Si NPs exhibit a time-dependent blue shift of the photoluminescence (PL) spectra and degrade with time due to spontaneous ambient oxidation . One of the strategies to protect the NPs from atmospheric degradation is to encapsulate or embed them in some protective material .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

One-Pot Synthesis of Gel Glass Embedded with Luminescent Silicon Nanoparticles

Das

Hossain

Pramanick

et al. 2018

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Preparation of highly luminescent glasses involves expensive and complicated processes and usually requires high temperature. In this work, we show that luminescent silicon (Si) nanoparticle (NP)-embedded silicate gel glasses can be developed under near-ambient conditions by a remarkably simple, one-pot strategy, without using any sophisticated instrumentation or technique. Simultaneous hydrolysis and reduction of (3-aminopropyl)triethoxysilane leads to the formation of colloidal Si nanocrystals that can be transformed to a glassy phase upon slow evaporation followed by freezing. Structural investigations reveal the formation of a sodium silicate gel glass framework having discernible shear bands, along with embedded Si NPs. High photoluminescence quantum yield (ca. 35−40%), low glass-transition temperature (T g ≈ 66−73 °C), strain-tolerant mechanical stability, and inexpensive preparation make the glass attractive for applications as display materials and photonic converters.

show abstract

“…Different forms of luminescent Si NCs have been extensively investigated for nearly thirty years and substantial amount of research has been directed to understand and control light emission from Si NCs and make them amenable for various applications [39][40][41][42]. However, till date, the exact mechanism involved in room temperature photoluminescence (PL) from Si nanostructures is not completely understood [43][44][45]. Notwithstanding this shortcoming in understanding the photophysics of Si NCs, there is one major advantage of Si NCs over most other light emitting semiconductor quantum dots-Si NCs are benign, non-toxic and are therefore excellent candidates for environment friendly probes [46].…”

Section: Introductionmentioning

confidence: 99%

Fluorescence quenching based detection of p-nitrophenol using luminescent silicon nanocrystals and insights into the quenching mechanism

Das

Hossain

Pakhira³

et al. 2020

Semicond. Sci. Technol.

View full text Add to dashboard Cite

We demonstrate a simple, rapid, selective and sensitive method for the detection of p-nitrophenol (pNP) using luminescent colloidal silicon nanocrystals (Si NCs). Aqueous suspension of green luminescent Si NCs was prepared at room temperature by simultaneous hydrolysis and redox reaction of (3-aminopropyl)triethoxysilane (APTES) in a remarkably simple one-step method. Trace addition of pNP significantly quenched the luminescence of the Si NCs and the quenching was found to be linearly dependent on the pNP concentration in the range of 0-20 μM of pNP in solution. Beyond 20 μM pNP concentration the quenching varied exponentially. Analysis of steady state absorption and emission, along with photoluminescence decay dynamics revealed that formation of ground state complexes (static quenching) and primary inner filter effect played a combined role in affecting quenching at relatively lower concentration range (0-20 μM); whereas both static and dynamic quenching came into effect at concentrations above 20 μM. Finally, we demonstrate a simple, pH-paper-type sensor based on Si NC coated filter paper and aluminium tape, for detection of aqueous as well as airborne pNP.

show abstract

Silicon-based core–shell nanostructures

Cited by 3 publications

References 94 publications

Quasi-Two-Dimensional Luminescent Silicon Nanosheets

Quasi-Two-Dimensional Luminescent Silicon Nanosheets

One-Pot Synthesis of Gel Glass Embedded with Luminescent Silicon Nanoparticles

Fluorescence quenching based detection of p-nitrophenol using luminescent silicon nanocrystals and insights into the quenching mechanism

Contact Info

Product

Resources

About