High-Performance Photoconductivity and Electrical Transport of ZnO/ZnS Core/Shell Nanowires for Multifunctional Nanodevice Applications

Jeong, Sehee; Choe, Minhyeok; Kang, Jang-Won; Kim, Min Woo; Jung, Wan Gil; Leem, Young‐Chul; Chun, Jaesun; Kim, Bong‐Joong; Park, Seong-Ju

doi:10.1021/am500731n

Cited by 46 publications

(33 citation statements)

References 37 publications

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“…Figure 2 shows the XRD patterns of the samples before and after annealing. We can observe that the peak at 34.44° and 28.83° can be identified to be the ZnO (002) and ZnS (111) of the core-shell NWs [25][26][27]. Among them, the peak intensity of ZnS (111) is weak along with a strong peak intensity of ZnO (002), indicating that the as-grown ZnO/ ZnS core-shell heterostructured NWs have a better crystal quality for the ZnO core.…”

Section: Resultsmentioning

confidence: 99%

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

Wei

Zhao

et al. 2016

Nanophotonics

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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.

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Section: Resultsmentioning

confidence: 99%

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

Wei

Zhao

et al. 2016

Nanophotonics

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“…An extremely important advantage of ZnO is its ability to crystallize in various morphological forms such as rods, tubes, plates, core-shell structures, etc. [22][23][24][25][26][27]. Currently, various of them are used in the construction of different types of electrical components such as piezoelectric sensors, ultraviolet radiation sensors, biosensors, and resistance gas sensors.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Microstructure and Chemical Composition of Zinc Oxide Gas Sensor Layers and Their Gas-Sensitive Properties in Chlorine Atmosphere

Fiedot‐Toboła¹,

Suchorska-Woźniak²,

Startek³

et al. 2020

Preprint

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In the article we present the results concerning the impact of structural and chemical properties of zinc oxide in various morphological forms, on its gas-sensitive properties tested in an atmosphere containing a very aggressive gas such as chlorine. Two types of ZnO sensor layers obtained by two different technological methods were used. Their morphology, crystal structure, specific surface area, porosity, surface chemistry and structural defects were characterized, and then compared with gas-sensitive properties in a chlorine-containing atmosphere. To achieve this goal scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy (PL) methods were used. The sensing properties of obtained active layers were tested by temperature stimulated conductance method (TSC). We have noticed that their response in chlorine atmosphere is not determined by the size of the specific surface or porosity. The obtained results showed that the structural defects of ZnO crystals play the most important role in chlorine detection. We demonstrated that the Cl2 adsorption is a concurrent process to oxygen adsorption. Both of them occur on the same active species (oxygen vacancies). They concentration is higher on the side planes of the zinc oxide crystal than the others. Thanks to the conducted studies authors demonstrated that to develop a new gas sensor devices not only changing of active layer chemical composition but also controlling its crystal structure and morphology could be used.

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“…Recently, nanomaterials, such as nanowire 1-4 , nanobelt [5][6][7] and nanotube [8][9][10] , polymer material 11 , have been extensively studied and utilized to form nano-devices for different application [12][13][14][15][16][17][18] . For metal-oxide nanomaterials, because the high surface-to-volume ratio and surface defect of nanostructures, which made the metal-oxide nanomaterials are quite sensitive for the environment variation [19][20][21][22][23][24][25][26] .…”

Section: Introductionmentioning

confidence: 99%

Surface defect engineering: gigantic enhancement in the optical and gas detection ability of metal oxide sensor

et al. 2016

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In this work, the detection ability of nanosensors can be improved extraordinary by surface defects engineering. The kinked SnO 2-X /SnO 2 nanostructure was fabricated by tuning the oxygen flow and used this kinked SnO 2-X /SnO 2 nanostructure to study the mechanism of surface defect (oxygen vacancy, V O ) affection through the electric measurement. For UV light sensing, the response of SnO 2-X NW device is always better than SnO 2 NW device, two orders higher under pure O 2 surrounding condition. The detection mechanism can be clarified by changing the detection environment (oxygen concentration) and the UV light detection sensitivity can be improved by increasing the surface V O density. Furthermore, the SnO 2-X NW device is very sensitive to its surrounding environment due to the high surface V O density. Hence, the CO/O 2 alternate-detection was used to verify our hypothesis; the results show that the SnO 2-X NW device presents great detection ability, compared with SnO 2 NW device. The sensitivity of SnO 2-X NW device is two order enhancements and the reset/response time is faster, compared with SnO 2 NW device. To verify this hypothesis, the polycrystalline structure was fabricated to prove that the detection ability of metal-oxide nanosensors can be improved gigantically by increasing surface defect amount.

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High-Performance Photoconductivity and Electrical Transport of ZnO/ZnS Core/Shell Nanowires for Multifunctional Nanodevice Applications

Cited by 46 publications

References 37 publications

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

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

Correlation between Microstructure and Chemical Composition of Zinc Oxide Gas Sensor Layers and Their Gas-Sensitive Properties in Chlorine Atmosphere

Surface defect engineering: gigantic enhancement in the optical and gas detection ability of metal oxide sensor

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