Optical and Excitonic Properties of Crystalline ZnS Nanowires: Toward Efficient Ultraviolet Emission at Room Temperature

Chen, Rui; Li, Dehui; Liu, Bo; Peng, Zhé; Gurzadyan, Gagik G.; Xiong, Qihua; Sun, Handong

doi:10.1021/nl102987z

Cited by 117 publications

(99 citation statements)

References 37 publications

(65 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In both cases, band edge (excitonic transition) emissions were not detected and the radiative emissions were associated with point and surface defects. 29,30 The quantum yield of the CdS and ZnS nanoconjugates was estimated to be ~1% and 2%, respectively, which is in good agreement with reports published about QDs synthesized using low temperatures and aqueous colloidal routes.…”

supporting

confidence: 88%

Surface biofunctionalized CdS and ZnS quantum dot nanoconjugates for nanomedicine and oncology: to be or not to be nanotoxic?

Mansur¹,

Mansur²,

Carvalho³

et al. 2016

IJN

View full text Add to dashboard Cite

Herein, for the first time, we demonstrated that novel biofunctionalized semiconductor nanomaterials made of Cd-containing fluorescent quantum dot nanoconjugates with the surface capped by an aminopolysaccharide are not biologically safe for clinical applications. Conversely, the ZnS-based nanoconjugates proved to be noncytotoxic, considering all the parameters investigated. The results of in vitro cytotoxicity were remarkably dependent on the chemical composition of quantum dot (CdS or ZnS), the nature of the cell (human cancerous and embryonic types), and the concentration and time period of exposure to these nanomaterials, caused by the effects of Cd 2+ on the complex nanotoxicity pathways involved in cellular uptake. Unexpectedly, no decisive evidence of nanotoxicity of CdS and ZnS conjugates was observed in vivo using intravenous injections in BALB/c mice for 30 days, with minor localized fluorescence detected in liver tissue specimens. Therefore, these results proved that CdS nanoconjugates could pose an excessive threat for clinical applications due to unpredicted and uncorrelated in vitro and in vivo responses caused by highly toxic cadmium ions at biointerfaces. On the contrary, ZnS nanoconjugates proved that the “safe by design” concept used in this research (ie, biocompatible core–shell nanostructures) could benefit a plethora of applications in nanomedicine and oncology.

show abstract

supporting

confidence: 88%

Surface biofunctionalized CdS and ZnS quantum dot nanoconjugates for nanomedicine and oncology: to be or not to be nanotoxic?

Mansur¹,

Mansur²,

Carvalho³

et al. 2016

IJN

View full text Add to dashboard Cite

show abstract

“…[37,[76][77][78][79][80] Due to the flexibility and ease of employing metal films as catalysts to initiate 1D crystal growth, various groups used chemical vapor deposition (CVD) to synthesize II-VI and III-V semiconductor NWs. [81][82][83][84][85] Despite its versatility, the CVD approach is undesirable for synthesising perovskite NWs due to the low growth temperature of perovskite. Therefore, using the facile solution processable approach to prepare lead halide perovskite is the most appealing approach available to date.…”

Section: D Perovskite: Nanowires and Nanorodsmentioning

confidence: 99%

“…[6,43,27,[86][87][88] In light of this, there are also a few reported works that utilize the solution processable method to synthesize lead halide perovskite nanorods (NRs) and NWs. [37,80,83,89,90] Yang et al were the first to synthesis vertical CH 3 NH 3 PbBr 3 NR arrays by spin-coating a saturated methanolic solution of lead acetate onto substrates, which were then immersed in a CH 3 NH 3 Br solution. [86] Their study revealed the possibility of large-scale production of perovskite NR arrays for various potential optoelectronic applications.…”

Section: D Perovskite: Nanowires and Nanorodsmentioning

confidence: 99%

Low‐Dimensional Perovskites: From Synthesis to Stability in Perovskite Solar Cells

Yusoff

Nazeeruddin

2017

Advanced Energy Materials

View full text Add to dashboard Cite

ruthenium molecular dye, wide absorption range, direct and tunable bandgaps, superior charge carrier mobility, and long carrier diffusion length. [6,[43][44][45] Although it has been synthesized for over 100 years, Mitzi et al. were the first to investigate the electrical properties of tin-based perovskite in 1994, [46] which was later used in numerous devices, including field effect transistors (FETs) and LEDs. [47][48][49] The attention toward metal halide perovskites sparked yet again in 2009, [42] and they were later named one of the most promising emerging technologies in 2016. In brief, metal halide perovskites can be divided into two types based on their crystal structure motif: (i) 3D-structured perovskite (AMX 3 ) and (ii) 2D-structured perovskite (A 2 MX 4 ). The structure of the perovskite could either be 2D or 3D, while the dimensions of the perovskite probably belong to 0D-3D. The term "perovskite" implies to the general class of materials derived from an elemental composition of AMX 3 and demonstrates the crystal structure of perovskite crystal CaTiO 3 , where the divalent metal M resides at the body center and surrounded by six X-anions located at the face centers in an octahedral cluster. The MX 6 in the octahedral cluster may form an extended 3D structure by all-corner-connected type with A-cation sitting at the center. It could also form a 2D perovskite when the 3D perovskite network is cut into one-layer-thick slices along the 〈100〉 direction and separates them apart. In principle, 2D perovskite is the easiest to synthesize because of its natural layered structure, which is held together by weak van der Waals forces. Dou et al. reported the large-scale synthesis of the monolayer (C 4 H 9 NH 3 ) 2 -PbBr 4 by a chemical method. [50] Along the same lines, several groups have prepared and characterized nanomaterials composed of various forms of perovskites. [51][52][53] Also, our group has recently successfully prepared a low-dimensional mixed 2D/3D perovskite using the protonated salt of amino valeric acid iodide (AVAI) as an organic precursor mixed with PbI 2 , in which a yellowish film was containing needle-like crystallite formed. [54] In this topical review, we present the latest advances in the synthesis of low-dimensional perovskites and the growth mechanism to develop a strategy to achieve best performing devices. Later, we focus the instability and a cost-effective solution to circumvent this problem, which is vital for the eventual deployment of perovskite solar cells to consumers market. We present an analysis of the origins for instability in perovskite solar cells, and present a summary of the main achievements and possible future developments of these low-dimensional perovskite. [2,55] Perovskite solar cells have been heralded as one of the most promising emerging technologies in 2016 because of the very high power conversion efficiency of 22% and the low cost of generating electricity compared to even fossil fuels. These are formed with various dimensionalities and can be fully mani...

show abstract

“…The disappearing of jagged boundary was ascribed to the inter-diffusing of oxygen and sulfur atoms that lead to the formation of ZnOS ternary alloy, which is consistent with the XRD result. From the close-up region of corresponding areas (colored boxes) in Figure 4B, well-defined lattice fringes with planar d-spacing of 0.26 and 0.32 nm can be indexed as ZnO (002) plane ( Figure 4E) and ZnS (111) plane ( Figure 4F), demonstrating the successful construction of the coreshell heterostructure [28][29][30].…”

Section: Resultsmentioning

confidence: 97%

Investigation of localized and delocalized excitons in ZnO/ZnS core-shell heterostructured nanowires

Wei

Zhao

et al. 2016

Nanophotonics

Self Cite

View full text Add to dashboard Cite

Abstract:The localized states in ZnO nanowires (NWs) through the growth of ZnS shell have been introduced in this paper. Morphology and optical properties of the ZnO/ ZnS core-shell heterostructured NWs after different rapid thermal annealing (RTA) treatments are investigated. Transmission electron microscopy measurements show the gradual disappearing of the jagged boundary between ZnO and ZnS with the increase of RTA temperature, while a decrease of interfacial composition fluctuation and a formation of ZnOS phase can be found after a RTA treatment of 300°C. Temperature-dependent photoluminescence exhibits the features of "S-shape" peak positions and a "valley shape" for the emission width, implying the existence of localized excitons in the core-shell NWs. Moreover, it is noted that the RTA treatments can lower the localized degree which is confirmed by optical measurement. The results indicate that the optical behavior of excitons in ZnO/ZnS core-shell heterostructured NWs can be manipulated by appropriate thermal treatments, which is very important for their practical device applications.

show abstract

Optical and Excitonic Properties of Crystalline ZnS Nanowires: Toward Efficient Ultraviolet Emission at Room Temperature

Cited by 117 publications

References 37 publications

Surface biofunctionalized CdS and ZnS quantum dot nanoconjugates for nanomedicine and oncology: to be or not to be nanotoxic?

Surface biofunctionalized CdS and ZnS quantum dot nanoconjugates for nanomedicine and oncology: to be or not to be nanotoxic?

Low‐Dimensional Perovskites: From Synthesis to Stability in Perovskite Solar Cells

Investigation of localized and delocalized excitons in ZnO/ZnS core-shell heterostructured nanowires

Contact Info

Product

Resources

About