Journal of colloid and interface science, Jan 15, 2017
Three polysiloxane/epoxy hybrids obtained by evolving cage- or linear-structured polysiloxane int... more Three polysiloxane/epoxy hybrids obtained by evolving cage- or linear-structured polysiloxane into poly glycidyl methacrylate (PGMA) matrix are compared used as coatings. One is the cage-structured hybrid of P(GMA/MA-POSS) copolymer obtained by GMA and methacrylisobutyl polyhedral oligomeric silsesquioxane (MA-POSS) via free radical polymerization, the other two are PGMA/NH2-POSS and PGMA/NH2-PDMS hybrids by cage-structured aminopropyllsobutyl POSS (NH2-POSS) or linear-structured diamino terminated poly(dimethylsiloxane) (NH2-PDMS) to cure PGMA. The effect of MA-POSS, NH2-POSS and NH2-PDMS on polysiloxane/epoxy hybrid films is characterized according to their surface morphology, transparency, permeability, adhesive strength and thermo-mechanical properties. Due to caged POSS tending to agglomerate onto the film surface, P(GMA/MA-POSS) and PGMA/NH2-POSS films exhibit much more heterogeneous surfaces than PGMA/NH2-PDMS film, but the well-compatibility between epoxy matrix and MA-POSS ...
A novel hybrid metallic cobalt insided in multiwalled carbon nanotubles/molybdenum disulfide (Co@... more A novel hybrid metallic cobalt insided in multiwalled carbon nanotubles/molybdenum disulfide (Co@CNT/MoS2) modified glass carbon electrode (GCE) was fabricated with a adhesive of Nafion suspension and used as chemical sensors for sulfide detection. Single-layered MoS2 was coated on CNTs through magnetic traction force between paramagnetic monolayer MoS2 and Co particles in CNTs. Co particles faciliated the collection of paramagnetic monolayer MoS2 exfoliated from bulk MoS2 in solution. Amperometric analysis, cycle voltammetry, cathodic stripping analysis and linear sweep voltammetry results showed the Co@CNT/MoS2 modified GCE exhibited excellent electrochemical activity to sulfide in buffer solutions, but amperometric analysis was found to be more sensitive than the other methods. The amperometric response result indicated the Co@CNT/MoS2-modified GCE electrode was an excellent electrochemical sensor for detecting S(2-) with a detection limit of 7.6 nM and sensitivity of 0.23 mA/μM....
Organic dye molecules possessing modulated optical absorption band-width and molecular structures... more Organic dye molecules possessing modulated optical absorption band-width and molecular structures, can be utilized as sensitizing species for the enhancement of photodetector performance of semiconductor via photoinduced charge transfer mechanism. MoS2 photodetector were modified by drop-casting of Methyl orange (MO), Rhodamine 6G (R6G), and Methylene blue (MB) with different molecular structures and extinction coefficients, and enhanced photodetector performance in terms of photocurrent, photoresponsity, photodetectivity, and external quantum efficiency were obtained after modification of MO, R6G, and MB, respectively. Furthermore, dyes showed different modulating ability for photodetector performance after combination with MoS2, mainly due to the variation of molecular structures and optical absorption band-width. Among tested dyes, deposition of MB onto monolayer MoS2 grown by CVD resulted in photocurrent ~20 times as high as pristine MoS2 due to favorable photoinduced charge tra...
2008 Chinese Conference on Pattern Recognition, 2008
ABSTRACT Images, polygonal models and point clouds are three kinds of heterogeneous cross-media r... more ABSTRACT Images, polygonal models and point clouds are three kinds of heterogeneous cross-media resources, but they can stand for the same object. We introduce two kinds of homogeneous descriptions for them. First, we find a relation between surface moment invariants and shape distribution since they both use invariant geometric primitives. This relation can provide a way to approximate surface moment invariants for point clouds. Hence, we can get the same shape description for both point clouds and polygonal models. Second, we project each D model in many directions and get large numbers of 2D images. Then, polygonal models and images are converted to the same data format for comparison. Homogeneous shape description makes it possible to carry out heterogeneous cross-media retrieval in pervasive environment.
Physical chemistry chemical physics : PCCP, Jan 28, 2014
CuGaSe2 is an important non-layered I-III-VI2 compound with superior optical properties. In this ... more CuGaSe2 is an important non-layered I-III-VI2 compound with superior optical properties. In this work, monocrystal two-dimensional (2D) CuGaSe2 nanosheets were successfully synthesized via a simple solid-state reaction. The electronic and optoelectronic properties of photodetectors based on 2D CuGaSe2 nanosheets were investigated for the first time. 2D CuGaSe2 FETs present a typical p-type conductance behaviour, and photodetectors based on 2D CuGaSe2 show a sensitive response to the UV-visible spectrum. Under 490 nm light illumination, the responsivity and detectivity of photodetectors are as high as 103 AW(-1) and 8 × 10(11) Jones, respectively. Our results offer a new opportunity to use 2D CuGaSe2 nanosheets for future nano-optoelectronic devices.
The back gate multilayer InSe FETs exhibit ultrahigh carrier mobilities, surpassing all the repor... more The back gate multilayer InSe FETs exhibit ultrahigh carrier mobilities, surpassing all the reported layer semiconductor based electronics with the same device configuration, which is achieved by the suppression of the carrier scattering from interfacial coulomb impurities or surface polar phonons at the interface of an oxidized dielectric substrate. The room-temperature mobilities of multilayer InSe transistors increase from 64 cm(2)V(-1)s(-1) to 1055 cm(2)V(-1)s(-1) using a bilayer dielectric of poly-(methyl methacrylate) (PMMA)/Al2O3. The transistors also have high current on/off ratios of 1 × 10(8), low standby power dissipation, and robust current saturation in a broad voltage range.
This work is focused on achieving high performance multilayer InSe field-effect transistors by a ... more This work is focused on achieving high performance multilayer InSe field-effect transistors by a systematic experiment study on metal contacts. The high performance can be achieved by choosing an ideal contact metal and adopting a proper thickness of InSe nanosheets. By choosing a proper thickness (33 nm), the performance of multilayer InSe FETs was improved by the following sequence of Al, Ti, Cr and In contacts. The extracted mobility values are 4.7 cm(2) V(-1) s(-1), 27.6 cm(2) V(-1) s(-1), 74 cm(2) V(-1) s(-1) and 162 cm(2) V(-1) s(-1) for Al, Ti, Cr and In, respectively. The on/off ratios are 10(7)-10(8). The device electronic properties and the interface morphology of the deposition metals/InSe indicate that the contact interface between the metals and InSe plays a significant role in forming low resistance. Our study may pave the way for multilayer InSe applications in nano-electrical and nano-optoelectronic devices.
Journal of colloid and interface science, Jan 15, 2017
Three polysiloxane/epoxy hybrids obtained by evolving cage- or linear-structured polysiloxane int... more Three polysiloxane/epoxy hybrids obtained by evolving cage- or linear-structured polysiloxane into poly glycidyl methacrylate (PGMA) matrix are compared used as coatings. One is the cage-structured hybrid of P(GMA/MA-POSS) copolymer obtained by GMA and methacrylisobutyl polyhedral oligomeric silsesquioxane (MA-POSS) via free radical polymerization, the other two are PGMA/NH2-POSS and PGMA/NH2-PDMS hybrids by cage-structured aminopropyllsobutyl POSS (NH2-POSS) or linear-structured diamino terminated poly(dimethylsiloxane) (NH2-PDMS) to cure PGMA. The effect of MA-POSS, NH2-POSS and NH2-PDMS on polysiloxane/epoxy hybrid films is characterized according to their surface morphology, transparency, permeability, adhesive strength and thermo-mechanical properties. Due to caged POSS tending to agglomerate onto the film surface, P(GMA/MA-POSS) and PGMA/NH2-POSS films exhibit much more heterogeneous surfaces than PGMA/NH2-PDMS film, but the well-compatibility between epoxy matrix and MA-POSS ...
A novel hybrid metallic cobalt insided in multiwalled carbon nanotubles/molybdenum disulfide (Co@... more A novel hybrid metallic cobalt insided in multiwalled carbon nanotubles/molybdenum disulfide (Co@CNT/MoS2) modified glass carbon electrode (GCE) was fabricated with a adhesive of Nafion suspension and used as chemical sensors for sulfide detection. Single-layered MoS2 was coated on CNTs through magnetic traction force between paramagnetic monolayer MoS2 and Co particles in CNTs. Co particles faciliated the collection of paramagnetic monolayer MoS2 exfoliated from bulk MoS2 in solution. Amperometric analysis, cycle voltammetry, cathodic stripping analysis and linear sweep voltammetry results showed the Co@CNT/MoS2 modified GCE exhibited excellent electrochemical activity to sulfide in buffer solutions, but amperometric analysis was found to be more sensitive than the other methods. The amperometric response result indicated the Co@CNT/MoS2-modified GCE electrode was an excellent electrochemical sensor for detecting S(2-) with a detection limit of 7.6 nM and sensitivity of 0.23 mA/μM....
Organic dye molecules possessing modulated optical absorption band-width and molecular structures... more Organic dye molecules possessing modulated optical absorption band-width and molecular structures, can be utilized as sensitizing species for the enhancement of photodetector performance of semiconductor via photoinduced charge transfer mechanism. MoS2 photodetector were modified by drop-casting of Methyl orange (MO), Rhodamine 6G (R6G), and Methylene blue (MB) with different molecular structures and extinction coefficients, and enhanced photodetector performance in terms of photocurrent, photoresponsity, photodetectivity, and external quantum efficiency were obtained after modification of MO, R6G, and MB, respectively. Furthermore, dyes showed different modulating ability for photodetector performance after combination with MoS2, mainly due to the variation of molecular structures and optical absorption band-width. Among tested dyes, deposition of MB onto monolayer MoS2 grown by CVD resulted in photocurrent ~20 times as high as pristine MoS2 due to favorable photoinduced charge tra...
2008 Chinese Conference on Pattern Recognition, 2008
ABSTRACT Images, polygonal models and point clouds are three kinds of heterogeneous cross-media r... more ABSTRACT Images, polygonal models and point clouds are three kinds of heterogeneous cross-media resources, but they can stand for the same object. We introduce two kinds of homogeneous descriptions for them. First, we find a relation between surface moment invariants and shape distribution since they both use invariant geometric primitives. This relation can provide a way to approximate surface moment invariants for point clouds. Hence, we can get the same shape description for both point clouds and polygonal models. Second, we project each D model in many directions and get large numbers of 2D images. Then, polygonal models and images are converted to the same data format for comparison. Homogeneous shape description makes it possible to carry out heterogeneous cross-media retrieval in pervasive environment.
Physical chemistry chemical physics : PCCP, Jan 28, 2014
CuGaSe2 is an important non-layered I-III-VI2 compound with superior optical properties. In this ... more CuGaSe2 is an important non-layered I-III-VI2 compound with superior optical properties. In this work, monocrystal two-dimensional (2D) CuGaSe2 nanosheets were successfully synthesized via a simple solid-state reaction. The electronic and optoelectronic properties of photodetectors based on 2D CuGaSe2 nanosheets were investigated for the first time. 2D CuGaSe2 FETs present a typical p-type conductance behaviour, and photodetectors based on 2D CuGaSe2 show a sensitive response to the UV-visible spectrum. Under 490 nm light illumination, the responsivity and detectivity of photodetectors are as high as 103 AW(-1) and 8 × 10(11) Jones, respectively. Our results offer a new opportunity to use 2D CuGaSe2 nanosheets for future nano-optoelectronic devices.
The back gate multilayer InSe FETs exhibit ultrahigh carrier mobilities, surpassing all the repor... more The back gate multilayer InSe FETs exhibit ultrahigh carrier mobilities, surpassing all the reported layer semiconductor based electronics with the same device configuration, which is achieved by the suppression of the carrier scattering from interfacial coulomb impurities or surface polar phonons at the interface of an oxidized dielectric substrate. The room-temperature mobilities of multilayer InSe transistors increase from 64 cm(2)V(-1)s(-1) to 1055 cm(2)V(-1)s(-1) using a bilayer dielectric of poly-(methyl methacrylate) (PMMA)/Al2O3. The transistors also have high current on/off ratios of 1 × 10(8), low standby power dissipation, and robust current saturation in a broad voltage range.
This work is focused on achieving high performance multilayer InSe field-effect transistors by a ... more This work is focused on achieving high performance multilayer InSe field-effect transistors by a systematic experiment study on metal contacts. The high performance can be achieved by choosing an ideal contact metal and adopting a proper thickness of InSe nanosheets. By choosing a proper thickness (33 nm), the performance of multilayer InSe FETs was improved by the following sequence of Al, Ti, Cr and In contacts. The extracted mobility values are 4.7 cm(2) V(-1) s(-1), 27.6 cm(2) V(-1) s(-1), 74 cm(2) V(-1) s(-1) and 162 cm(2) V(-1) s(-1) for Al, Ti, Cr and In, respectively. The on/off ratios are 10(7)-10(8). The device electronic properties and the interface morphology of the deposition metals/InSe indicate that the contact interface between the metals and InSe plays a significant role in forming low resistance. Our study may pave the way for multilayer InSe applications in nano-electrical and nano-optoelectronic devices.
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