In the past decades there have been many breakthroughs in low-dimensional materials,especially in two-dimensional(2D)atomically thin crystals like graphene.As structural analogues of graphene but with a sizeable band ...In the past decades there have been many breakthroughs in low-dimensional materials,especially in two-dimensional(2D)atomically thin crystals like graphene.As structural analogues of graphene but with a sizeable band gap,monolayers of atomically thin transition metal dichalcogenides(with formula of MX2,M=Mo,W;X=S,Se,Te,etc.)have emerged as the ideal 2D prototypes for exploring fundamentals in physics such as valleytronics due to the quantum confinement effects,and for engineering a wide range of nanoelectronic,optoelectronic,and photocatalytic applications.Transition metal trioxides as promising materials with low evaporation temperature,high work function,and inertness to air have been widely used in the fabrication and modification of MX2.In this review,we reported the fabrications of one-dimensional MoS2 wrapped MoO2 single crystals with varied crystal direction via atmospheric pressure chemical vapor deposition method and of 2D MoOx covered MoX2 by means of exposing MoX2 to ultraviolet ozone.The prototype devices show good performances.The approaches are common to other transition metal dichalcogenides and transition metal oxides.展开更多
The aim of this experiment was to investigate the effect of Lycium barbarum polysaccharides(LBP) on alleviating soybean meal-induced enteritis(SBMIE) in spotted sea bass Lateolabrax maculatus. The diet with 44% fishme...The aim of this experiment was to investigate the effect of Lycium barbarum polysaccharides(LBP) on alleviating soybean meal-induced enteritis(SBMIE) in spotted sea bass Lateolabrax maculatus. The diet with 44% fishmeal(FM) content was used as a blank control, and soybean meal(SM) was used to replace50% FM as an experimental control to induce enteritis. Then, on the basis of experimental control, 0.10%0.15%, and 0.20% LBP were added as experimental diets. A total of 225 spotted sea bass(44.52 ± 0.24 g)were randomly divided into 5 groups and fed the corresponding diets for 52 d. The results showed that0.15% LBP decreased serum D-lactic acid(D-LA) content and diamine oxidase(DAO) activity(P < 0.05). In addition, in all LBP supplementation groups, the intestinal tissue morphology was significantly improved(P < 0.05);the intestinal microbial structure gradually recovered to a level close to that without adding SM;and the microbial species richness and diversity were significantly increased(P < 0.05). Through transcriptomic and metabolomic analysis, it was found that the expression of proinflammatory factors such as interleukin-1β(IL-1β), interleukin-12(IL-12), nuclear factor kappa B subunit 2(NF-κB2), and Tolllike receptor 2(TLR2) were significantly down-regulated in the mitogen-activated protein kinase(MAPK)and Toll-like receptor signaling pathways(P < 0.05), and the important tight junction protein gene Occludin was up-regulated(P < 0.05). In addition, LBP down-regulated saponin metabolites and upregulated amino acid metabolites(P < 0.05). In conclusion, LBP demonstrated a significant alleviating effect on SBMIE of spotted sea bass L. maculatus.展开更多
Strain sensors with good stability are vital to the development of wearable healthcare monitoring systems.However,the design of strain sensor with both duration stability and environmental stability is still a challen...Strain sensors with good stability are vital to the development of wearable healthcare monitoring systems.However,the design of strain sensor with both duration stability and environmental stability is still a challenge.In this work,we propose an ultra-stable and washable strain sensor by embedding a coupled composite film of carbon nanotube(CNT)and Ti_(3)C_(2)T_(x) MXene into polydimethylsiloxane(PDMS)matrix.The composite strain sensor with embedded microstructure and uneven surface makes it conformal to skin,while the CNT/MXene sensing layer exhibits a resistance sensitive to strain.This sensor shows reliable responses at different frequencies and with long-term cycling durability(over 1,000 cycles).Meanwhile,the CNT/MXene/PDMS composite strain sensor provides the advantages of superior anti-interference to temperature change and water washing.The results demonstrate less than 10%resistance changes as the temperature rises from-20 to 80℃or after sonication in water for 120 min,respectively.The composite sensor is applied to monitor human joint motions,such as bending of finger,wrist and elbow.Moreover,the simultaneous monitoring of the electrocardiogram(ECG)signal and joint movement while riding a sports bicycle is demonstrated,enabling the great potential of the as-fabricated sensor in real-time human healthcare monitoring.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.11874427)the National Science Foundation DMR-1903962the Fundamental Research Funds for the Central Universities of Central South University(Grant No.2019zzts429).
文摘In the past decades there have been many breakthroughs in low-dimensional materials,especially in two-dimensional(2D)atomically thin crystals like graphene.As structural analogues of graphene but with a sizeable band gap,monolayers of atomically thin transition metal dichalcogenides(with formula of MX2,M=Mo,W;X=S,Se,Te,etc.)have emerged as the ideal 2D prototypes for exploring fundamentals in physics such as valleytronics due to the quantum confinement effects,and for engineering a wide range of nanoelectronic,optoelectronic,and photocatalytic applications.Transition metal trioxides as promising materials with low evaporation temperature,high work function,and inertness to air have been widely used in the fabrication and modification of MX2.In this review,we reported the fabrications of one-dimensional MoS2 wrapped MoO2 single crystals with varied crystal direction via atmospheric pressure chemical vapor deposition method and of 2D MoOx covered MoX2 by means of exposing MoX2 to ultraviolet ozone.The prototype devices show good performances.The approaches are common to other transition metal dichalcogenides and transition metal oxides.
基金funded by Science and Technology Planning Project in Fujian,China(grant No.2015N0010)Science and Technology Planning Project in Xiamen,China(grant No.3502Z20143017).
文摘The aim of this experiment was to investigate the effect of Lycium barbarum polysaccharides(LBP) on alleviating soybean meal-induced enteritis(SBMIE) in spotted sea bass Lateolabrax maculatus. The diet with 44% fishmeal(FM) content was used as a blank control, and soybean meal(SM) was used to replace50% FM as an experimental control to induce enteritis. Then, on the basis of experimental control, 0.10%0.15%, and 0.20% LBP were added as experimental diets. A total of 225 spotted sea bass(44.52 ± 0.24 g)were randomly divided into 5 groups and fed the corresponding diets for 52 d. The results showed that0.15% LBP decreased serum D-lactic acid(D-LA) content and diamine oxidase(DAO) activity(P < 0.05). In addition, in all LBP supplementation groups, the intestinal tissue morphology was significantly improved(P < 0.05);the intestinal microbial structure gradually recovered to a level close to that without adding SM;and the microbial species richness and diversity were significantly increased(P < 0.05). Through transcriptomic and metabolomic analysis, it was found that the expression of proinflammatory factors such as interleukin-1β(IL-1β), interleukin-12(IL-12), nuclear factor kappa B subunit 2(NF-κB2), and Tolllike receptor 2(TLR2) were significantly down-regulated in the mitogen-activated protein kinase(MAPK)and Toll-like receptor signaling pathways(P < 0.05), and the important tight junction protein gene Occludin was up-regulated(P < 0.05). In addition, LBP down-regulated saponin metabolites and upregulated amino acid metabolites(P < 0.05). In conclusion, LBP demonstrated a significant alleviating effect on SBMIE of spotted sea bass L. maculatus.
基金supported by the National Natural Science Foundation of China(No.61804185)the National Key Research and Development Program of China(No.2017YFA0206600)+3 种基金the Natural Science Foundation of Hunan Province(No.2019JJ50804)the Science and Technology Innovation Program of Hunan Province(No.2020RC4004)the Special Funding for the Construction of Innovative Provinces in Hunan Province(No.2020GK2024)Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing(No.GXKL06200208).
文摘Strain sensors with good stability are vital to the development of wearable healthcare monitoring systems.However,the design of strain sensor with both duration stability and environmental stability is still a challenge.In this work,we propose an ultra-stable and washable strain sensor by embedding a coupled composite film of carbon nanotube(CNT)and Ti_(3)C_(2)T_(x) MXene into polydimethylsiloxane(PDMS)matrix.The composite strain sensor with embedded microstructure and uneven surface makes it conformal to skin,while the CNT/MXene sensing layer exhibits a resistance sensitive to strain.This sensor shows reliable responses at different frequencies and with long-term cycling durability(over 1,000 cycles).Meanwhile,the CNT/MXene/PDMS composite strain sensor provides the advantages of superior anti-interference to temperature change and water washing.The results demonstrate less than 10%resistance changes as the temperature rises from-20 to 80℃or after sonication in water for 120 min,respectively.The composite sensor is applied to monitor human joint motions,such as bending of finger,wrist and elbow.Moreover,the simultaneous monitoring of the electrocardiogram(ECG)signal and joint movement while riding a sports bicycle is demonstrated,enabling the great potential of the as-fabricated sensor in real-time human healthcare monitoring.
