Room Temperature Mid-IR Detection through Localized Surface Vibrational States of SnTe Nanocrystals

Cryer, Matthew E.; Halpert, Jonathan E.

doi:10.1021/acssensors.8b00448

Cited by 9 publications

(7 citation statements)

References 67 publications

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Section: Resultsmentioning

confidence: 99%

“…In general the diameter and size distribution of our syntheses agree with previous reports. 9,12,13 Additional details of these syntheses and purification steps may be found in the SI (Section S1.2.2). Measured elemental composition is presented in Tables 1 and S1, with typical results visualized in Figures 3(a−f), S2, and S3.…”

Section: Resultsmentioning

confidence: 99%

“…Another binary semiconductor material, SnTe, presents a less toxic alternative to PbE and HgE within the short-wave and mid-wave infrared regions . In addition to its reduced toxicity, bulk SnTe has several novel qualities not typically found in other IR NCs, including its inverted direct band gap, self-doped nature caused by Sn vacancies, as well as its characterization as a topological crystalline insulator. − Although these unique properties make SnTe interesting to study for IR applications, its nanoscale photophysical properties are poorly understood.…”

Section: Introductionmentioning

confidence: 99%

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Synthetic Mechanisms in the Formation of SnTe Nanocrystals

O’Neill

Krauss

2022

J. Am. Chem. Soc.

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Infrared active colloidal semiconducting nanocrystals (NCs) are important for applications including photodetectors and photovoltaics. While much research has been conducted on nanocrystalline materials such as the Pb and Hg chalcogenides, less toxic alternatives such as SnTe have been far less explored. Previous synthetic work on SnTe NCs have characterized photophysical properties of the nanoparticles. This study focuses on understanding the fundamental chemical mechanisms involved in SnTe NC formation, with the aim to improve synthetic outcomes. The solvent oleylamine, common to all SnTe syntheses, is found to form a highly reactive, heteroleptic Sn-oleylamine precursor that is the primary molecular Sn species initiating NC formation and growth. Further, the capping ligand oleic acid (OA) reacts with this amine to produce tin oxide (SnO x ), facilitating the formation of an NC SnO x shell. Therefore, the use of OA during synthesis is counterproductive to the formation of stoichiometric SnTe nanoparticles. The knowledge of chemical reaction mechanisms creates a foundation for the production of high-quality, unoxidized, and stoichiometric SnTe NCs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthetic Mechanisms in the Formation of SnTe Nanocrystals

O’Neill

Krauss

2022

J. Am. Chem. Soc.

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“…This often allows the size and shape of nanomaterial particles to be studied [ 183 , 184 ]. An EDX analyser is used to provide elemental identification and not quantitative compositional information (% weight of the constituent in the nanocrystal) [ 185 ] as well as element distribution in nanomaterials (mapping analysis) [ 186 , 187 ]. The sample is irradiated with electrons resulting in the emission of X-rays characteristic to the elements present.…”

Section: Surface Chemistry Of Qdsmentioning

confidence: 99%

Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

et al. 2022

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Since the discovery of Quantum Dots (QDs) by Alexey I. Ekimov in 1981, the interest of researchers in that particular type of nanomaterials (NMs) with unique optical and electrical properties has been increasing year by year. Thus, since 2009, the number of scientific articles published on this topic has not been less than a thousand a year. The increasing use of QDs due to their biomedical, pharmaceutical, biological, photovoltaics or computing applications, as well as many other high-tech uses such as for displays and solid-state lighting (SSL), has given rise to a considerable number of studies about its potential toxicity. However, there are a really low number of reported studies on the detection and quantification of QDs, and these include ICP–MS and electrochemical analysis, which are the most common quantification techniques employed for this purpose. The knowledge of chemical phenomena occurring on the surface of QDs is crucial for understanding the interactions of QDs with species dissolved in the dispersion medium, while it paves the way for a widespread use of chemosensors to facilitate its detection. Keeping in mind both human health and environmental risks of QDs as well as the scarcity of analytical techniques and methodological approaches for their detection, the adaptation of existing techniques and methods used with other NMs appears necessary. In order to provide a multidisciplinary perspective on QD detection, this review focused on three interrelated key aspects of QDs: properties, surface chemistry and detection.

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“…established mid‐infrared (MIR) detection beyond 3 µm, allowing for achieving a high‐performance photodetector working in a broadband wavelength ranging from deep ultraviolet (UV) to the MIR region with high responsivity, by using SnTe QDs and nanoparticles. [ 36,37 ] Although few studies revealed that Sn chalcogenides (SnS, [ 38,39 ] SnSe [ 40 ] ) are good nonlinear materials, no studies have been presented till date regarding the NLO properties and saturable absorption performance of SnTe QDs or other Sn chalcogenides‐based QDs.…”

Section: Introductionmentioning

confidence: 99%

Tin Telluride Quantum Dots as a Novel Saturable Absorber for Q‐Switching and Mode Locking in Fiber Lasers

Ahmed

Qiao

Cheng

et al. 2020

Advanced Optical Materials

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Tin telluride (SnTe) quantum dots (QDs) have attracted considerable interest in the optoelectronic field owing to their favorable properties over conventional QDs, such as a relatively large Bohr radius (95 nm) and low toxicity level. However, till date, the nonlinear optical properties and ultrafast photonics applications of SnTe QDs have remained unexplored. In this study, SnTe QDs with an average diameter of 74 nm (smaller than the Bohr radius of SnTe) are fabricated via a liquid‐phase exfoliation method. Consequently, the nonlinear saturable absorption properties of such SnTe QDs are explored by realizing a modulation depth of 2.2% and saturable intensity of 1.67 GW cm−2. The prepared QDs are then used as saturable absorber (SA) in the erbium‐doped fiber laser ring cavity system. Moreover, Q‐switched and mode‐locked laser pulses with a pulse width of 1.81 µs and 691 fs are generated, respectively. Harmonic mode‐locking with a high repetition rate of 62.1 MHz (fifth order) is experimentally realized. This is the first demonstration, to the authors’ knowledge, of using SnTe QDs‐SA for generating ultrafast laser pulses along with high‐repetition‐rate harmonic mode‐locking pulses. Therefore, this study will establish a new research scope for SnTe QDs in ultrafast photonics, nonlinear photonics, frequency combs, and optical communications.

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Room Temperature Mid-IR Detection through Localized Surface Vibrational States of SnTe Nanocrystals

Cited by 9 publications

References 67 publications

Synthetic Mechanisms in the Formation of SnTe Nanocrystals

Synthetic Mechanisms in the Formation of SnTe Nanocrystals

Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

Tin Telluride Quantum Dots as a Novel Saturable Absorber for Q‐Switching and Mode Locking in Fiber Lasers

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