Ultraviolet Emission of ZnS Nanoparticles Confined within a Functionalized Mesoporous Host

Chae, Weon‐Sik; Yoon, Joong Ho; Yu, Hyunung; Jang, Du‐Jeon; Kim, Yong Rok

doi:10.1021/jp048349m

Cited by 70 publications

(58 citation statements)

References 34 publications

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“…Even though there is a great interest in the photoluminescence (PL) properties of one-dimensional (1D) ZnS nanostructures, few studies are available in the literature on possible UV emission at room temperature. The reported UV emissions from ZnS are at 365 [11], 322 [12], 333 [13], 375 [14], 374 [15], and 380 nm [16], and these are have fewer applications in device fabrication because of the feeble emission nature. Enhanced optical properties of ZnS nanocrystals are also obtained by using capping agents and surfactants like trioctylphosphine oxide (TOPO) [17], chitosan [18], trioctylphosphine oxide [19], ethylenediamine, dodecylthiol [20], 1-ethyl-3-methylimidazolium ethyl sulphate [21], and didecyldimethylammonium bromide (DDAB) [22] during the synthesis process.…”

Section: Introductionmentioning

confidence: 99%

Boosted UV emission at 349 nm from mesoporous ZnS

2013

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Relatively oxygen-free mesoporous cubic ZnS particles were synthesised via a facile solvo-hydrothermal route using a water-acetonitrile combination. Boosted UV emission at 349 nm is observed from the ZnS prepared by the solvo-hydrothermal route. The increased intensity of this UV emission is attributed to activation of whispering gallery modes of almost elliptical microstructures made of porous nanostructures.

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Section: Introductionmentioning

confidence: 99%

Boosted UV emission at 349 nm from mesoporous ZnS

2013

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“…[3] There have been many reports of attempts to control the size and morphology of ZnS including solvothermal routes, [4] thermal evaporation, [5] reverse micelle templates, [6] as well as intercalation in zeolites, [7] and mesoporous silica MCM-41. [8][9][10] Layered compounds have also been shown to be potential hosts: by virtue of confining the growth of nanoparticles inside the interlamellar galleries, the reaction zone is spatially constrained by the layers, [11][12][13] giving rise to conditions similar to those in two-dimensional nanoreactors such as Langmuir-Blodgett (LB) films and self-assembled monolayers. [14,15] One great advantage of such methods compared with lithographic fabrication is that reg-shift in the bandgap compared with the bulk material.…”

Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxides Containing Intercalated Zinc Sulfide Nanoparticles: Synthesis and Characterization

Wang

Evans

et al. 2006

Eur J Inorg Chem

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Nanosized ZnS has been synthesized in the interlayer galleries of Mg-Al layered double hydroxides (LDHs) by a process involving ion exchange of a Mg 2 Al-NO 3 LDH precursor with a zinc-citrate complex {Na 2 [Zn(C 6 H 4 O 7 )]·3 H 2 O} followed by reaction between the intercalated [Zn(C 6 H 4 O 7 )] 2-anions and H 2 S. The materials have been characterized by elemental analysis, powder X-ray diffraction (XRD), transmission electron microscopy, FTIR spectroscopy, MAS 13 C NMR spectroscopy, and UV/Vis diffuse reflectance spectroscopy, and structural models have been proposed. The XRD diffraction patterns indicate that the layered structure is maintained and that the basal spacing in the intercalated materials depends on the orientation of the citrate moiety. The results confirm that cubic ZnS (sphalerite) is formed in the interlamellar domain rather than on the external surfaces and is co-intercalated with citrate dianions. The growth of ZnS particles is constrained by the layers of the LDH resulting in a large blue

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“…It im plies that the guest chalcogenide is in cor po rated within the nanochannels of the mesoporous host: The in cor po rated guest of ten re duces the diffractional con trast be tween the po rous chan nel and the wall frame work of the mesoporous ma te ri als. 5,6,33 More over, it is note wor thy that the in cor po rated guest chalcogenide within the AlMCM-41 host pres ents weak dif frac tion peaks at 17.7°, 27.5°, and 31.4° in 2θ (in di cated by as ter isks) where the mesoporous host and the amorphous bulk guest show only broad dif frac tion pat terns in this wide-angle re gion (in set of Fig. 1).…”

Section: Re Sults and Discussionmentioning

confidence: 86%

“…E-mail: yrkim@yonsei.ac.kr and jjscm@kangnung.ac.kr morphologies. 32,33 Al though the var i ous fab ri ca tion meth od ol o gies have con tin u ously been de vel oped for struc tur ally con fined nano composite sys tems, con trolled stud ies of the en er getic prop er ties are lim ited to a few tri als for the nanocomposite sys tems in clud ing the monofunctional ma te ri als such as semi con duc tors 24,32,33 and or ganic com pounds. [29][30][31] Since the mag neto-semiconductors show mul ti ple re sponses depend ing on the ap plied op ti cal and/or mag netic fields, 34,35 they can be uti lized to be po ten tial ma te ri als for multifunctional nanodevices.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, mesoporous ma te ri als have been uti lized as templates for the emis sion con trol which is in duced by the struc tural con fine ment of the semi con duc tor quan tum dots. 24,32,33 The pre vi ous stud ies sug gest that the sur face state emis sion could be re moved by the se lec tive elim i nation of the sur face de fect sites with the functionalized mesoporous nanochannels, which pro vide the con trol la ble di rect excitonic emis sion in duced by unique nanopatterned …”

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confidence: 99%

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Structural Confinement Effects of an Amorphous Magneto‐Semiconductor within Nanochannels

Chae

Choi

Kim

et al. 2006

J Chinese Chemical Soc

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Op ti cal and mag netic prop er ties have been in ves ti gated for the struc tur ally con fined amor phous magneto-semiconductor, ter nary chalcogenide, within the nanochannels of the mesoporous host. The structural con fine ment in duced a weak crys tal lo graphic or der ing of the mag neto-semiconductor within the nanochannels. Unique op ti cal prop er ties were ob served for this nanocomposite, which were pos s i bly due to the size and en ergy quantization of the con fined guest chalcogenide within the nanochannels. The structural con fine ment also in duced the sup pres sion of the phonon cou pling to the photoexcited car ri ers dur ing the car ri ers' re com bi na tion pro cess. The spin-glass freez ing tem per a ture (T f = 4.2 K) which was the charac ter is tic mag netic tran si tion tem per a ture for the amor phous bulk was shifted to 2.3 K for the con fined sys tem, pos si bly due to the gen er a tion of the superparamagnetic do mains in duced by the quan tum confine ment ef fect.Key words: Mag neto-semiconductor; Chalcogenide; Mesoporous; Exciton re com bi na tion; Spin-glass. IN TRO DUC TIONIn the field of nano-science and tech nol ogy, the pre cision con trols of size and shape and the main te nance of the nanostructure are im por tant re search sub jects for pro vid ing spe cific and sta ble nanoproperties. For these pur poses, nanotemplating has been sug gested as one prom is ing method.1-3 Re cently, var i ous mesoporous ma te ri als have been uti lized as templating nanomolds for nanocomposites and free-standing nanomaterials, which can pro vide sta ble and highly-ordered nanostructures. 4-10 To date, sev eral differ ent types of mesoporous ma te ri als have been fab ri cated to have the var i ous po rous struc tures which have con trolled pore di am e ters, 11,12 vari able com po si tions, 13-17 and designed morphologies. 18-23 Such uti li za tion of mesoporous tem plates have pro duced unique nanomaterials of semicon duc tors, met als, mag nets, and or ganic com pounds, and which pres ent in ter est ing nano-chemical and phys i cal prop er ties. 23-31As one of the quan tum con fined sys tems, the semicon duc tor quan tum dot has been in ves ti gated in ten sively due to its tun able band-gap prop erty of quan tum size ef fect. How ever, the bare semi con duc tor quan tum dots typ i cally have a wide range of emis sions which orig i nate from several re com bi na tion path ways such as di rect band-to-band re com bi na tion, shal low-trapped re com bi na tion, and deeptrapped re com bi na tion in sur face de fects, etc. Es pe cially, the pre ci sion con trol of the emis sions orig i nat ing from the sur face de fect states is some what dif fi cult due to the complex bond ing na ture on the sur face of the quan tum dot. Recently, mesoporous ma te ri als have been uti lized as templates for the emis sion con trol which is in duced by the struc tural con fine ment of the semi con duc tor quan tum dots. 24,32,33 The pre vi ous stud ies sug gest that the sur face state emis sion could be re moved by...

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Ultraviolet Emission of ZnS Nanoparticles Confined within a Functionalized Mesoporous Host

Cited by 70 publications

References 34 publications

Boosted UV emission at 349 nm from mesoporous ZnS

Boosted UV emission at 349 nm from mesoporous ZnS

Layered Double Hydroxides Containing Intercalated Zinc Sulfide Nanoparticles: Synthesis and Characterization

Structural Confinement Effects of an Amorphous Magneto‐Semiconductor within Nanochannels

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