Aluminum nanocrystals evolving from cluster to metallic state: Size tunability and spectral evidence

Wu, Hao; Cheng, Xiaoyu; Dong, Haohao; Xie, Songjun; He, Sailing

doi:10.1007/s12274-021-3486-9

Cited by 10 publications

(10 citation statements)

References 52 publications

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“…The first three samples of AlQDs showed PL in the UV-B region (∼290 to ∼320 nm, fwhm ∼ 50 nm), while the last sample showed PL in the visible region (∼425 nm, fwhm ∼ 70 nm). This was interesting, as we had previously shown that the core of AOT-AlQDs was metallic instead of having oxides . The distinct emission behavior of AlQDs suggested that all samples made with cationic surfactants containing nitrogen exhibited photoluminescence in UV, but AlQDs synthesized with anionic surfactants containing sulfonic groups (−SO 3 2– ) emitted in the blue region.…”

Section: Resultsmentioning

confidence: 78%

“…This was interesting, as we had previously shown that the core of AOT-AlQDs was metallic instead of having oxides. 22 The distinct emission behavior of AlQDs suggested that all samples made with cationic surfactants containing nitrogen exhibited photoluminescence in UV, but AlQDs synthesized with anionic surfactants containing sulfonic groups (−SO 3 2−…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…18−20 Our study revealed AlQDs synthesized through different surfactants formed reverse micelles and yielded distinctive emission behavior, which indicated a key role of organic capping groups in tuning their emission. 21,22 Specifically, the used surfactant tetraoctylammonium bromide (TOAB) has four long alkyl chains and showed a symmetrical structure, which may be beneficial for charge extraction and transport. 23 Lee et al proposed a protocol to achieve ultra-high photoluminescence (PL) efficiency by rigidifying the gold shell of Au 22 (SG) 18 (SG = glutathione) with TOA + .…”

Section: ■ Introductionmentioning

confidence: 99%

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Aluminum Quantum Dots with Surface Controlled Blue-UV Photoluminescence

Cheng

Xie

et al. 2023

J. Phys. Chem. C

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Aluminum quantum dots (AlQDs) are an emerging class of optical material due to their unique photoluminescence in the ultraviolet waveband. Herein, a strategy is presented to control their photoluminescence emission. The synthesized AlQDs displayed photoluminescence from the UV-B region (<320 nm) to the near-ultraviolet region (∼425 nm) and high quantum yields. Our investigation revealed that surfactants and phosphonic acids (PAs) were competitively bound to the surface of AlQDs, and this was affected by the space volume of surfactants and charge of head groups. The steady-state and time-resolved spectroscopic data suggested the emission properties of AlQDs mainly originated from the surface-mediated states. The red-shifting of emission peak was a result of increased amount of PAs on the surface of AlQDs, which could be related to the surface oxygen presented in both ligands and surfactants. Overall, this study indicates a method to control the photoluminescence of AlQDs by changing the surfactants and surface ligands, which is fundamental to their applications in photonics and applications to energy and environment, in addition to biomedicine.

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Section: Resultsmentioning

confidence: 78%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aluminum Quantum Dots with Surface Controlled Blue-UV Photoluminescence

Cheng

Xie

et al. 2023

J. Phys. Chem. C

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“…Another direction worth exploring is the effect of surfaceenhanced resonant Raman scattering (SERRS) effects in this system. Resonant Raman can be important for its high-bond selectivity and capability for multiplexed detection (Faulds et al, 2005) This is particularly attractive when performed in ultraviolet waveband because DNAs and proteins absorb UV light strongly (Renard et al, 2019;Wu et al, 2021) Since there are many studies in the literature focusing on ultrasensitive SERS measurements, a main advantage of this study is not to show the sensitivity is more superior than that of others but to demonstrate accessibility and high sensitivity can be achieved at the same time with ease with cost-effective instruments. In fact, pM sensitivity already answers to clinical demand, and the method is scalable at an industrial level.…”

Section: Analysis Of Staphylococcus Aureus Nucleic Acidmentioning

confidence: 99%

Magnetically Enhanced Liquid SERS for Ultrasensitive Analysis of Bacterial and SARS-CoV-2 Biomarkers

Zhang

Yang

et al. 2021

Front. Bioeng. Biotechnol.

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In this work, it is shown that surface-enhanced Raman scattering (SERS) measurements can be performed using liquid platforms to perform bioanalysis at sub-pM concentrations. Using magnetic enrichment with gold-coated magnetic nanoparticles, the high sensitivity was verified with nucleic acid and protein targets. The former was performed with a DNA fragment associated with the bacteria Staphylococcus aureus, and the latter using IgG antibody, a biomarker for COVID-19 screening. It is anticipated that this work will inspire studies on ultrasensitive SERS analyzers suitable for large-scale applications, which is particularly important for in vitro diagnostics and environmental studies.

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“…A century after the concept of chemical bonding was elucidated, some unusual bonds continue to be discovered, causing much excitement and a wide scope for the development of novel materials. In this context, bottom up synthesis methods of nanoclusters have an unparalleled advantage of putting together some of the unprecedented elements for controlled property dependent structure generation with practically no loss of material. − Several state of the art methods have been deployed to put together monatomic subnanoparticles such as Cu, − Ga, − Al, Si, − Rh, − Ru, ,, Fe, − and V into more mixed binary clusters, − ,− resulting in atomic level engineering of property dependent materials. − …”

Section: Introductionmentioning

confidence: 99%

Understanding the Stability of an Unprecedented Si–Be Bond within Quantum Confinement

2023

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As of today, the Si–Be bond remains underexplored in the literature, and therefore its anomalous behavior continues to be an unsolved puzzle to date. Therefore, the present study aims at evaluating the integrity of an unprecedented Si–Be bond within quantum confinement. To accomplish this, first-principles-based calculation are performed on Be-doped silicon clusters with atomic sizes 6, 7, and 10. Silicon clusters are sequentially doped with one, two, and three Be atoms, and their thermal response is registered in the temperature range of 200–1500 K, which discloses several research findings. During the course of the simulations, the clusters face various thermal events such as solid cluster phase, rapid structural metamorphosis, and fragmentation. Si–Be nanoalloy clusters are noted to be thermally stable at lower temperatures (200–700 K); however, they begins to disintegrate earlier at a temperature as low as 800 K. This lower stability is attributed to the weak nature of Si and Be heteroatomic interactions, which is corroborated from the structural and electronic property analysis of the doped clusters. In addition to this, the performance of Be-doped clusters at finite temperatures is also compared with the thermal response of two other popular systems, viz., C- and B-doped silicon clusters.

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Aluminum nanocrystals evolving from cluster to metallic state: Size tunability and spectral evidence

Cited by 10 publications

References 52 publications

Aluminum Quantum Dots with Surface Controlled Blue-UV Photoluminescence

Aluminum Quantum Dots with Surface Controlled Blue-UV Photoluminescence

Magnetically Enhanced Liquid SERS for Ultrasensitive Analysis of Bacterial and SARS-CoV-2 Biomarkers

Understanding the Stability of an Unprecedented Si–Be Bond within Quantum Confinement

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