Mn doped SnO2 nanobelts (Mn:SnO2 NBs) and pure SnO2 nanobelts (SnO2 NBs) were synthesized by thermal evaporation technique at 1355°C with Ar carrier gas (25 sccm, 150 Torr). The SEM, EDS, XRD, TEM, HRTEM, SAED, X...Mn doped SnO2 nanobelts (Mn:SnO2 NBs) and pure SnO2 nanobelts (SnO2 NBs) were synthesized by thermal evaporation technique at 1355°C with Ar carrier gas (25 sccm, 150 Torr). The SEM, EDS, XRD, TEM, HRTEM, SAED, XPS, UV-Vis techniques were used to characterize the attained samples. The band gap of Mn doped SnO2 NBs by UV-Vis was measured to be 3.43 eV at room temperature, lower than that of the pure counterpart with ~3.66 eV. Mn:SnO2 NB and pure SnO2 NB sensors were developed. It is found that Mn:SnO2 NB device exhibits a higher sensitivity with 62.12% to 100 ppm of ethanol at 210°C, which is the highest sensitivity among the three tested VOC gases (ethanol, ethanediol, and acetone). The theoretical detection limit for ethanol of the sensor is 1.1 ppm. The higher response is related to the selective catalysis of the doped Mn ions.展开更多
Developing highly robust and efficient electrode materials is of critical importance to promoting the energy density of current supercapacitors for commercialization.Herein,we report an efficient catalyst with monodis...Developing highly robust and efficient electrode materials is of critical importance to promoting the energy density of current supercapacitors for commercialization.Herein,we report an efficient catalyst with monodispersed Mn single-atoms embedded in carbon nanotubes(Mn-CNTs)for enhancing the electrode performance of supercapacitors.A high specific capacitance(1523.6 F·g^(-1) at 1.0 A·g^(-1))can be achieved,which is about twice as high as the specific capacitance of the electrode material without the introduction of Mn single-atoms.Remarkably,the asymmetric electrochemical capacitor created with Mn-CNT and activated carbon exhibits a high energy density of 180.8 Wh·kg^(-1) at a power density of 1.4 kW·kg^(-1),much higher than most reported results.The study shows that the integration of Mn atoms into the CNT can enhance the charge transport capacity and the number of polar active sites of Mn-CNT and then facilitate chemical interactions between Mn-CNT and OH-.This work provides a novel strategy to enable high-energy storage in supercapacitors by introducing single-atoms into carbon nanotubes to improve electrodes’energy density and cycle life.展开更多
Two-dimensional(2D)transition metal dichalcogenides have been extensively studied due to their fascinating physical properties for constructing high-performance photodetectors.However,their relatively low responsiviti...Two-dimensional(2D)transition metal dichalcogenides have been extensively studied due to their fascinating physical properties for constructing high-performance photodetectors.However,their relatively low responsivities,current on/off ratios and response speeds have hindered their widespread application.Herein,we fabricated a high-performance photodetector based on few-layer MoTe_(2) and CdS_(0.42)Se_(0.58) flake heterojunctions.The photodetector exhibited a high responsivity of 7221 A/W,a large current on/off ratio of 1.73×10^(4),a fast response speed of 90/120μs,external quantum efficiency(EQE)reaching up to 1.52×10^(6)%and detectivity(D*)reaching up to 1.67×10^(15) Jones.The excellent performance of the heterojunction photodetector was analyzed by a photocurrent mapping test and first-principle calculations.Notably,the visible light imaging function was successfully attained on the MoTe_(2)/CdS_(0.42)Se_(0.58) photodetectors,indicating that the device had practical imaging application prospects.Our findings provide a reference for the design of ultrahighperformance MoTe_(2)-based photodetectors.展开更多
Gut microbiota play important roles in host health and diseases.Several factors,in particular antibiotics,affect the gut microbiota of pigs.Cross-fostering has been applied as a regular practice to equalize litter siz...Gut microbiota play important roles in host health and diseases.Several factors,in particular antibiotics,affect the gut microbiota of pigs.Cross-fostering has been applied as a regular practice to equalize litter size,reduce pre-weaning mortality and increase body weight.However,the effect of cross-fostering on cecal microbiota is unclear.In this study,we fostered three Jinhua pigs to a Yorkshire sow.The fostered Jinhua piglets grew significantly faster than their biological siblings.To explore whether the cecal microbiota of piglets will alter during fostering,we characterized the cecal microbiota of allpiglets by examining the V3 hypervariable region of 16S rDNA.We observed altered cecal microbiota in these piglets using the Illumina HiSeq 2000 platform,and this was accompanied with an increase in growth rate after fostering.The relative abundance of Bacteroidetes in the fostered Jinhua piglets was decreased compared with their biological siblings,although still higher in comparison with their new littermates.Beta-diversity analysis also showed that the cecal microbiota of the adopted Jinhua piglets differed from their biological siblings with a shift toward their step-siblings.Our data show that cecal microbiota of piglets were altered after cross-fostering while the growth rate increased.展开更多
By high-throughput calculations,13 thermally and environmentally stable Janus MA_(2)Z_(4) monolayers were screened from 104 types of candidates.The 13 stable monolayers have very high charge carrier concentrations(...By high-throughput calculations,13 thermally and environmentally stable Janus MA_(2)Z_(4) monolayers were screened from 104 types of candidates.The 13 stable monolayers have very high charge carrier concentrations(×10^(15) cm^(–2)),which are better than those of the well-known graphene and TaS_(2).Because of their excellent conductivity,the 6 monolayers with band gaps less than 0.5 eV are identified as potential electrode materials for hydrogen evolution reaction applications.For potential applications as photoelectric or photocatalytic materials,bandgaps(Eg-HSE)higher than 0.5 eV remained,which resulted in 7 potential candidates.Based on optical absorption analysis in the visible-light range,H-HfSiGeP_(4) and HMoSiGeP_(4) have higher absorption ability and optical conductivity,which is quite impressive for optoelectronic,solar cell device,and photocatalysis applications.Additionally,the transmittance coefficient of Janus MA_(2)Z_(4) monolayers is approximately 70%–80%in the visible-light range,which implies that these monolayers show good light transmittance.For potential applications as photocatalysts,the redox potential and charge effective mass analysis indicate that H-HfSiGeP_(4),HMoSiGeP_(4),T-ScSiGeN_(4),and T-ZrSiGeN_(4) are suitable photocatalysts for CO_(2) reduction reactions.Using high-throughput identification,13 types of new and stable Janus MA2Z4 monolayers were explored,and the basic properties and potential applications were investigated,which can reduce the time for experiments and provide basic data for the material genome initiative.展开更多
Monolayer molybdenum disulfide(MoS_(2))has weak light absorption due to its atomically-thin thickness,thus hindering the development of MoS_(2)-based optoelectronic devices.CdS_(x)Se_(1-x)has excellent photoelectric p...Monolayer molybdenum disulfide(MoS_(2))has weak light absorption due to its atomically-thin thickness,thus hindering the development of MoS_(2)-based optoelectronic devices.CdS_(x)Se_(1-x)has excellent photoelectric performance in the visible light range,and its nanostructure shows great potential in new nanoscale electronic and optoelectronic devices.In this work,a composite photodetector device with the combination of monolayer MoS_(2)nanosheets and CdS_(0.42)Se_(0.58)nanobelts has been successfully prepared,which can not only maintain the inherent excellent properties of the two blocks,but also play a synergistic role between them,thus improving the photoelectric performance of the device.The monolayer MoS_(2)nanosheet/CdS_(0.42)Se_(0.58)nanobelt photodetector has a wide spectral response range(400–800 nm),high responsivity(527.22 A/W)and large external quantum efficiency(EQE)(1.06×10^(5)%).Compared with the isolated monolayer MoS_(2)nanosheet,both the responsivity and EQE of the hybrid photodetector are increased by 117.4 times under 620 nm illumination.This study provides a way to prepare hybrid photodetectors with wide spectral response and high responsivity.展开更多
文摘Mn doped SnO2 nanobelts (Mn:SnO2 NBs) and pure SnO2 nanobelts (SnO2 NBs) were synthesized by thermal evaporation technique at 1355°C with Ar carrier gas (25 sccm, 150 Torr). The SEM, EDS, XRD, TEM, HRTEM, SAED, XPS, UV-Vis techniques were used to characterize the attained samples. The band gap of Mn doped SnO2 NBs by UV-Vis was measured to be 3.43 eV at room temperature, lower than that of the pure counterpart with ~3.66 eV. Mn:SnO2 NB and pure SnO2 NB sensors were developed. It is found that Mn:SnO2 NB device exhibits a higher sensitivity with 62.12% to 100 ppm of ethanol at 210°C, which is the highest sensitivity among the three tested VOC gases (ethanol, ethanediol, and acetone). The theoretical detection limit for ethanol of the sensor is 1.1 ppm. The higher response is related to the selective catalysis of the doped Mn ions.
基金supported by the Yunnan provincial education department scientific research fund project(No.2022J0815)Special Youth Project for Fundamental Research in Yunnan Province(No.202301AU070227)+3 种基金the National Natural Science Foundation of China(No.12264056)Yunnan Expert Workstation(No.202205AF150008)support from the International Joint Research Center for Intelligent Nano Environmental Protection New Materials and Testing Technology(No.SDGH2108)the Collaborative Innovation Center of Suzhou Nano Science&Technology,the 111 Project,and Joint International Research Laboratory of Carbon-Based Functional Materials and Devices.
文摘Developing highly robust and efficient electrode materials is of critical importance to promoting the energy density of current supercapacitors for commercialization.Herein,we report an efficient catalyst with monodispersed Mn single-atoms embedded in carbon nanotubes(Mn-CNTs)for enhancing the electrode performance of supercapacitors.A high specific capacitance(1523.6 F·g^(-1) at 1.0 A·g^(-1))can be achieved,which is about twice as high as the specific capacitance of the electrode material without the introduction of Mn single-atoms.Remarkably,the asymmetric electrochemical capacitor created with Mn-CNT and activated carbon exhibits a high energy density of 180.8 Wh·kg^(-1) at a power density of 1.4 kW·kg^(-1),much higher than most reported results.The study shows that the integration of Mn atoms into the CNT can enhance the charge transport capacity and the number of polar active sites of Mn-CNT and then facilitate chemical interactions between Mn-CNT and OH-.This work provides a novel strategy to enable high-energy storage in supercapacitors by introducing single-atoms into carbon nanotubes to improve electrodes’energy density and cycle life.
基金This work was supported by the National Natural Science Foundation of China(Nos.11864046 and 11764046)the Basic Research Program of Yunnan Province(Nos.202001AT070064 and 202101AT070124)+1 种基金the Spring City Plan(Highlevel Talent Promotion and Training Project of Kunming)(No.2022SCP005)Yunnan Expert Workstation(No.202205AF150008).
文摘Two-dimensional(2D)transition metal dichalcogenides have been extensively studied due to their fascinating physical properties for constructing high-performance photodetectors.However,their relatively low responsivities,current on/off ratios and response speeds have hindered their widespread application.Herein,we fabricated a high-performance photodetector based on few-layer MoTe_(2) and CdS_(0.42)Se_(0.58) flake heterojunctions.The photodetector exhibited a high responsivity of 7221 A/W,a large current on/off ratio of 1.73×10^(4),a fast response speed of 90/120μs,external quantum efficiency(EQE)reaching up to 1.52×10^(6)%and detectivity(D*)reaching up to 1.67×10^(15) Jones.The excellent performance of the heterojunction photodetector was analyzed by a photocurrent mapping test and first-principle calculations.Notably,the visible light imaging function was successfully attained on the MoTe_(2)/CdS_(0.42)Se_(0.58) photodetectors,indicating that the device had practical imaging application prospects.Our findings provide a reference for the design of ultrahighperformance MoTe_(2)-based photodetectors.
基金supported by the National Special Foundation for Transgenic Species of China(2014ZX0800950B,2011ZX08006-003)the Specialized Research Fund of Ministry of Agriculture of China(NYCYTX-009)+3 种基金the Fundof Fok Ying-Tung Education Foundation(141117)the Fund for Distinguished Young Scientists of Sichuan Province(2013JQ0013)the Program for Changjiang Scholars and Innovative Research Teamin University(IRT13083)to Mingzhou Li and Xuewei Lithe‘‘100-Talent Program’’in Sichuan Science Foundation for Youths of Sichuan Province to Ying Li
文摘Gut microbiota play important roles in host health and diseases.Several factors,in particular antibiotics,affect the gut microbiota of pigs.Cross-fostering has been applied as a regular practice to equalize litter size,reduce pre-weaning mortality and increase body weight.However,the effect of cross-fostering on cecal microbiota is unclear.In this study,we fostered three Jinhua pigs to a Yorkshire sow.The fostered Jinhua piglets grew significantly faster than their biological siblings.To explore whether the cecal microbiota of piglets will alter during fostering,we characterized the cecal microbiota of allpiglets by examining the V3 hypervariable region of 16S rDNA.We observed altered cecal microbiota in these piglets using the Illumina HiSeq 2000 platform,and this was accompanied with an increase in growth rate after fostering.The relative abundance of Bacteroidetes in the fostered Jinhua piglets was decreased compared with their biological siblings,although still higher in comparison with their new littermates.Beta-diversity analysis also showed that the cecal microbiota of the adopted Jinhua piglets differed from their biological siblings with a shift toward their step-siblings.Our data show that cecal microbiota of piglets were altered after cross-fostering while the growth rate increased.
基金supported by the National Natural Science Foundation of China(No.52262042)the Starting Funds for High-level Talents from Yunnan Normal University.
文摘By high-throughput calculations,13 thermally and environmentally stable Janus MA_(2)Z_(4) monolayers were screened from 104 types of candidates.The 13 stable monolayers have very high charge carrier concentrations(×10^(15) cm^(–2)),which are better than those of the well-known graphene and TaS_(2).Because of their excellent conductivity,the 6 monolayers with band gaps less than 0.5 eV are identified as potential electrode materials for hydrogen evolution reaction applications.For potential applications as photoelectric or photocatalytic materials,bandgaps(Eg-HSE)higher than 0.5 eV remained,which resulted in 7 potential candidates.Based on optical absorption analysis in the visible-light range,H-HfSiGeP_(4) and HMoSiGeP_(4) have higher absorption ability and optical conductivity,which is quite impressive for optoelectronic,solar cell device,and photocatalysis applications.Additionally,the transmittance coefficient of Janus MA_(2)Z_(4) monolayers is approximately 70%–80%in the visible-light range,which implies that these monolayers show good light transmittance.For potential applications as photocatalysts,the redox potential and charge effective mass analysis indicate that H-HfSiGeP_(4),HMoSiGeP_(4),T-ScSiGeN_(4),and T-ZrSiGeN_(4) are suitable photocatalysts for CO_(2) reduction reactions.Using high-throughput identification,13 types of new and stable Janus MA2Z4 monolayers were explored,and the basic properties and potential applications were investigated,which can reduce the time for experiments and provide basic data for the material genome initiative.
基金supported by the National Natural Science Foundation of China(Nos.11864046 and 11764046)the Basic Research Program of Yunnan Province(Nos.202001AT070064 and 202101AT070124)Spring City Plan:the High-level Talent Promotion and Training Project of Kunming(2022SCP005).
文摘Monolayer molybdenum disulfide(MoS_(2))has weak light absorption due to its atomically-thin thickness,thus hindering the development of MoS_(2)-based optoelectronic devices.CdS_(x)Se_(1-x)has excellent photoelectric performance in the visible light range,and its nanostructure shows great potential in new nanoscale electronic and optoelectronic devices.In this work,a composite photodetector device with the combination of monolayer MoS_(2)nanosheets and CdS_(0.42)Se_(0.58)nanobelts has been successfully prepared,which can not only maintain the inherent excellent properties of the two blocks,but also play a synergistic role between them,thus improving the photoelectric performance of the device.The monolayer MoS_(2)nanosheet/CdS_(0.42)Se_(0.58)nanobelt photodetector has a wide spectral response range(400–800 nm),high responsivity(527.22 A/W)and large external quantum efficiency(EQE)(1.06×10^(5)%).Compared with the isolated monolayer MoS_(2)nanosheet,both the responsivity and EQE of the hybrid photodetector are increased by 117.4 times under 620 nm illumination.This study provides a way to prepare hybrid photodetectors with wide spectral response and high responsivity.
