Giant Zeeman splitting in nucleation-controlled doped CdSe:Mn2+ quantum nanoribbons

Yu, Jung Ho; Liu, Xinyu; Kweon, Kyoung E.; Joo, Jin; Park, Ji Won; Ko, K.-T.; Lee, Jun Young; Shen, S. C.; Tivakornsasithorn, Kritsanu; Son, Jae Sung; Park, Jae Hoon; Kim, Young Woon; Hwang, Gyeong S.; Dobrowolska, M.; Furdyna, J. K.; Hyeon, Taeghwan

doi:10.1038/nmat2572

Cited by 235 publications

(179 citation statements)

References 48 publications

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“…A similar phenomenon was also observed by Yao and coworkers on the Zn 0.98 Co 0.02 O NWs [78]. The substitutional incorporation of Mn ions up to 10% into CdSe quantum nano-ribbons was also readily achieved by Yu and coworkers via a nucleation-controlled doping process [79].…”

Section: Magnetic Semiconductor Nanostructuressupporting

confidence: 74%

X-ray absorption fine structure spectroscopy in nanomaterials

et al. 2015

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X-ray absorption fine structure (XAFS) spectroscopy has been widely used for decades in a wide range of scientific fields, including physics, chemistry, biology, materials sciences, environmental sciences, etc. This review article is devoted to the applications of XAFS in nanomaterials. The basic principles of XAFS are briefly described from the view point of practical application, including its theory, data analysis and experiments. Using selected examples from recent literatures, the power of XAFS in determination of local atomic/electronic structures is illustrated for various nanomaterials, covering metal and semiconductor nanoparticles, catalysts, core/shell structures, ultrathin nanosheets, and so on. The utilization of time-resolved XAFS technique is also briefly introduced, for in-situ probing the nucleation/growth processes of nanomaterials and identifying reaction intermediates of nanostructured catalysts under operando conditions.

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Section: Magnetic Semiconductor Nanostructuressupporting

confidence: 74%

X-ray absorption fine structure spectroscopy in nanomaterials

et al. 2015

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“…This value is much larger than that reported for nanoparticles in organic solution (0.5 emu g −1 for x = 3%). [ 14 ] Unlike Mn-doped II-VI nanocrystals, [ 1,2,7,17 ] the PL emission from the Mn dopants in PbS is either not observed or else is much weaker than the QD PL emission ( Figure 3 a,b): the weak Mn-related PL band is centered at ≈1.9 eV at room temperature, at higher energies relative to the much stronger PL emission wileyonlinelibrary.com www.particle-journal.com www.MaterialsViews.com of the nanocrystals (see Figure 3 b). Also, while the Mn-related PL band does not change with x , the QD PL emission tends to blueshift with increasing x : for PbS QDs with no Mn, the PL band is centered at E QD = 1.08 eV ( λ = 1150 nm) at T = 295 K; increasing Mn results in a monotonic energy blue-shift of the PL emission up to a value of E QD = 1.40 eV ( λ = 885 nm) at x = 18% (see Figure 3 a).…”

Section: Doi: 101002/ppsc201300184mentioning

confidence: 98%

“…[1][2][3] In particular, 3 d transition metal ions (Mn, Co, etc.) with their d -shell electronic confi gurations can imprint a nanocrystal with magnetic properties of relevance for innovative applications ranging from bio-imaging [ 4,5 ] to spintronics.…”

Section: Doi: 101002/ppsc201300184mentioning

confidence: 99%

Paramagnetic, Near‐Infrared Fluorescent Mn‐Doped PbS Colloidal Nanocrystals

Turyanska

Moro

Knott

et al. 2013

Part & Part Syst Charact

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The nanoscale design of nanocrystals by the controlled incorporation of dopant impurities is a research fi eld of fundamental interest with great potential for numerous disruptive technologies. [1][2][3] In particular, 3 d transition metal ions (Mn, Co, etc.) with their d -shell electronic confi gurations can imprint a nanocrystal with magnetic properties of relevance for innovative applications ranging from bio-imaging [ 4,5 ] to spintronics. [ 1,5 ] For example, colloidal nanocrystals doped with transition metals could provide versatile contrast agents for multimodal medical imaging, i.e., for contrast-enhanced magnetic resonance imaging (MRI) and confocal microscopy. [ 4 ] To date, a variety of nanoparticles (e.g., Fe 3 O 4 , FePt, MnFe 2 O 4 , and MnO) have been used for enhancedcontrast MRI, [ 5,6 ] but these require functionalization with fl uorescent organic dyes for optical imaging and their solubility in physiological solvents demands modifi cation of the nanocrystal surface. Luminescent, paramagnetic colloidal quantum dots, QDs (e.g., Mn-doped Si, ZnS, CdS/ZnS QDs) have also been previously studied. [7][8][9] However, these nanostructures require phase transfer to address water solubility and/or the visible photoluminescence (PL) emission limits their application in in vivo imaging due to strong photon absorption by biological tissues. Thus despite extensive research in this fi eld, paramagnetic nanoparticles with fl uorescence in the near-infrared (NIR) spectral region of the biological optical window are still not available.In this work, we report paramagnetic, NIR fl uorescent Mndoped PbS colloidal nanocrystals in an aqueous solution. We demonstrate the successful incorporation of Mn atoms in the nanocrystals, which contain up to 8% Mn. The nanocrystals are optically active at room temperature in the technologically important biological window between 1.2 μ m and 0.8 μ m; also, the Mn atoms imprint the nanoparticles with paramagnetic properties. Preliminary cytoxicity studies show that the exposure of human cell lines to the nanoparticles at concentrations up to 0.2 mg mL −1 does not induce any adverse effect, thus providing guidelines on safe doses for further toxicology studies and future applications in medical imaging.Our Mn-doped PbS nanocrystals in an aqueous solution differ from previously reported nanostructures based on PbS nanowires [ 10,11 ] and PbS nanocrystals in glass matrices [ 12,13 ] or in organic solvents. [ 14 ] To synthesize the Mn-doped PbS nanoparticles, we prepared a Pb 2+ precursor solution containing 2.5 × 10 −4 mol of lead acetate Pb(CH 3 COO) 2 , 1.5 × 10 −3 mol of thioglycerol (TGL) and 5 × 10 −4 mol of dithioglycerol (DTG) in 15 mL of deionized water, where the thiols act as capping agents. [ 15,16 ] The pH of the solution was adjusted to a value of 11.0 by addition of triethylamine. While maintaining the pH of the solution, manganese acetate Mn(CH 3 COO) 2 salt was added with Mn concentration, x , up to 18%. To facilitate the incorporation of the Mn atoms during the nu...

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“…12,13,[36][37][38][39][40] Most prominently, a strong quantum-confinement-induced change in the fundamental nature of the conduction-band-electron ( e CB − ) -Mn 2+ exchange (s-d exchange) interaction has been described both theoretically 36,37 and experimentally. 37,[41][42][43][44][45] According to k·p-model descriptions of Mn at finite k vectors. 36,37 This mixing has been proposed to turn on strong antiferromagnetic kinetic s-d exchange coupling that dominates over the weaker ferromagnetic potential s-d exchange coupling in DMS QDs and quantum wells (QWs).…”

Section: Introductionmentioning

confidence: 99%

Orbital pathways for Mn2+-carriersp−dexchange in diluted magnetic semiconductor quantum dots

et al. 2011

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Abstract. Manganese-carrier magnetic exchange interactions in strongly quantum confined -conduction-band-electron interaction is described well using the recently proposed ferromagnetic kinetic s-s exchange pathway. Antiferromagnetic kinetic s-d exchange interactions previously proposed to become dominant in quantum confined diluted magnetic semiconductors (DMSs) have been evaluated quantitatively by both DFT and perturbation theory and are found to be weak compared to the ferromagnetic s-s interaction, even in these strongly confined QDs. The magnitudes of the mean-field exchange parameters are found to be nearly independent of quantum confinement over this range of QD diameters, and the dominant orbital pathways are not fundamentally altered by quantum confinement.i.

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Giant Zeeman splitting in nucleation-controlled doped CdSe:Mn2+ quantum nanoribbons

Cited by 235 publications

References 48 publications

X-ray absorption fine structure spectroscopy in nanomaterials

X-ray absorption fine structure spectroscopy in nanomaterials

Paramagnetic, Near‐Infrared Fluorescent Mn‐Doped PbS Colloidal Nanocrystals

Orbital pathways for Mn2+-carriersp−dexchange in diluted magnetic semiconductor quantum dots

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