ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Lei Liu,Ziqiang Cheng,Bei Jiang,Yanxin Liu,Yanli Zhang,Fan Yang,Jiahong Wang,Xue-Feng Yu,Paul K. Chu,Cong Ye
The memristor is a foundational device for an artificial synapse, which is essential to realize next-generation neuromorphic computing. Herein, an optoelectronic memristor based on a two-dimensional (2D) transitional-metal trichalcogenide (TMTC) is designed and demonstrated. Owing to the excellent optical and electrical characteristics of titanium trisulfide (TiS3), the memristor exhibits stable bipolar resistance switching (RS) as a result of the controllable formation and rupturing of the conductive aluminum filaments. Multilevel storage is realized with light of multiple wavelengths between 400 and 808 nm, and the synaptic properties such as conduction modulation and spiking timing-dependent plasticity (STDP) are achieved. On the basis of the photonic potentiation and electrical habitual ability, Pavlovian-associative learning is successfully established on this TiS3-based artificial synapse. All these results reveal the large potential of 2D TMTCs in artificial neuromorphic chips.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 31
·14158-14166
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IF 3.591
Yuxiang Wang,Yue Liu,Xinan Shi,Lijian Huang,Junye Tong,Gang Wang,Daocheng Pan
Alkali-metal-ion doping is an efficient strategy to improve the device performance of thin film solar cells. Though doping with Li+ or Cs+ doping has been reported in Ag–Bi–I solar cells, the influence of doping with other alkali metal ions on Ag–Bi–I solar cells has not been systematically studied. In this work, we investigate the effects of five alkali metal ions (Li+, Na+, K+, Rb+, and Cs+) on the structure, morphology, and optical and electrical properties of Ag2BiI5 absorber layers, and also their influence on the device performance. All alkali-metal-doped Ag2BiI5 thin films show high crystallinity and have similar suitable band gaps. Hall effect measurements demonstrate that the alkali-metal-doped Ag2BiI5 films show an improved electrical performance compared with the pristine Ag2BiI5 thin film, which is beneficial to achieving high-efficiency solar cells. Unexpectedly, Cs+ doping can significantly increase the grain size of Ag2BiI5 thin films, leading to a porous absorber that reduces the device efficiency. The device performance of Li+-, Na+-, K+- and Rb+-doped Ag2BiI5 is significantly improved compared with that of pristine Ag2BiI5. It is found that the order of the power conversion efficiency promotion ability is K+ > Rb+ > Na+ > Li+ > Cs+ under the same experimental conditions. The present approach can be extended to other Bi-based solar cells to improve their device performance, which is critical for applications in absorbers with poor electrical performance or low crystallinity.
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Small
·
2021
·Vol. 17
·期 40
·2103239
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IF 13.281
Yanhong Duo,Guanghong Luo,Zihuang Li,Zide Chen,Xianming Li,Zhenyou Jiang,Binlu Yu,Hao Huang,Zhengbo Sun,Xue-feng Yu
Nanomaterial-based photothermal and photocatalytic therapies are effective against various types of cancers. However, combining two or more materials is considered necessary to achieve the synergistic anticancer effects of photothermal and photocatalytic therapy, which made the preparation process complicated. Herein, the authors describe simple 2D titanium diselenide (TiSe 2 ) nanosheets (NSs) that can couple photothermal therapy with photocatalytic therapy. The TiSe 2 NSs are prepared using a liquid exfoliation method. They show a layered structure and possess high photothermal conversion efficiency (65.58%) and good biocompatibility. Notably, upon near-infrared irradiation, these NSs exhibit good photocatalytic properties with enhanced reactive oxygen species generation and H 2 O 2 decomposition in vitro. They can also achieve high temperatures, with heat improving their catalytic ability to further amplify oxidative stress and glutathione depletion in cancer cells. Furthermore, molecular mechanism studies reveal that the synergistic effects of photothermal and enhanced photocatalytic therapy can simultaneously lead to apoptosis and necrosis in cancer cells via the HSP90/JAK3/NF-κB/IKB-α/Caspase-3 pathway. Systemic exploration reveals that the TiSe 2 NSs has an appreciable degradation rate and accumulates passively in tumor tissue, where they facilitate photothermal and photocatalytic effects without obvious toxicity. Their study thus indicates the high potential of biodegradable TiSe 2 NSs in synergistic phototherapy for cancer treatment.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jianjun Xiao,Qinfang Chen,Rui Yu,Jiayi Qian,Zihao Liu,Teng Li,Haiping Yang,Jing'ai Shao,Weiran Yang,Hanping Chen
Developing cost-effective and high-performance catalysts in biomass chemistry is motivated by creating sustainable technologies dependent on inexpensive and abundant resources. The existing methods for the direct preparation of 5-methylfurfural (5-MF) from biomass-derived fructose mediated by hydrogen iodide (HI) mainly require precious metal catalysts. This research showed that low-cost tungsten carbide (WC) was capable to produce HI from iodine (I 2 ) via liquid-phase hydrogenation, but a pivotal limitation was the poor stability under the combination effects of water and I 2 . To solve this problem, the bulk WC and the high dispersion supported WC were modified by hydrophobic organosilicones through simple liquid phase deposition. Both of the two superhydrophobic WC materials had better stability and their catalytic activity were comparable to the expensive palladium-carbon (Pd/C) catalyst in the preparation of 5-MF, especially the superhydrophobic high dispersion supported WC. This work highlights the potential of the low-cost WC with simple superhydrophobic modification in assisting the direct preparation of 5-MF from fructose mediated by HI, which has high significance to the sustainable development of the low-cost biomass chemical engineering.
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ACS Applied Energy Materials
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2021
·
IF 6.024
Cai Zuo,Hongping Li,Gong Chen,Jun Yang,Zhixin Xu,Zhigang Xue
Lithium metal batteries with liquid electrolytes usually suffer from the growth of lithium dendrites and safety issues such as leaking and volatilization. Solid polymer electrolytes (SPEs) can relieve these problems due to their chemical and electrochemistry stability. However, PEO-based SPEs are still too brittle to endure bending, stretching, and shearing. Herein, highly elastic cyclodextrin-based triblock polymer electrolytes (CDTPEs) were fabricated via the ring-opening polymerization and initiator-free thiol–ene reaction. The rubbery PTMC segment endows the CDTPEs excellent elasticity to suffer from bending, stretching, and complicated conditions. This CDTPE integrates an excellent elongation (580%) and favorable ionic conductivity (1.5 × 10–3 S cm–1 at 100 °C). More importantly, the stable lithium stripping/plating process for over 2200 h was achieved due to the uniform lithium electrodeposition. The cyclodextrin component is verified to be beneficial for the uniform lithium electrodeposition. The LiFePO4/CDTPE/Li cells exhibit stable cycling performance and reversible specific discharge capacity. Our work may provide a method for stabilizing lithium metal batteries.
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CARBON
·
2021
·
IF 9.594
Qingsong Li,Shitong Li,Qiangchun Liu,Xiaofang Liu,Jianglan Shui,Xiangkai Kong
Graphene-based metal-free aerogel is desirable for lightweight electromagnetic wave (EMW) absorbing materials. However, the weak van-der-Waals combination between graphene sheets , accompanied by the repulsion from surface oxygen-related polar groups, significantly hinder the transfer of electrons between the sheets, and lead to poor mechanical strength . These become bottlenecks for the further improvement of EMW absorption and have a huge impact on achieving multi-functions. Here, we used an iodine modification strategy to fabricate reduced graphene oxide (RGO) aerogel, in which graphene sheets are bridged by iodine cations (I + ). Meanwhile, iodine promotes the conversion of epoxy groups to hydroxyl groups on graphene, thereby facilitating the adhension of I + on the surface. These iodine cations rather than iodine anions are essential to strengthen the interconnection between graphene sheets, which enables the RGO aerogel to exhibit higher electrical conductivity , larger mechanical strength, higher thermal stability, and significantly improved EMW absorbing capability. With the improvement in conduction loss and impedance matching, the iodine-bridged RGO aerogel exhibits a maximium reflection loss of −52.8 dB and an effective absorption bandwidth of 7.2 GHz at 2 wt% filler loading, which are 3.8 and 1.5 times of pure RGO, respectively. Besides, the improved mechanical strength and resistance to temperature change benefit expanding the application fields of this aerogel.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2021
·Vol. 102
·期 7
·2651-2659
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IF 3.639
Tongtong Zhang,Khaing zar Myint,Yongmei Xia,Jing Wu
BACKGROUND Rebaudioside A (RA) and its monoglucosyl derivative, as like rebaudioside D (RD) are the most popular stevia glycosides but possess poor solubility in water, which limited their application as edible surfactants, the applications as in micellar solubilization and drug delivery. Meanwhile, effect of the monoglucosyl attached to RA moiety remains unclear. RESULTS Monoglucosyl rebaudioside A (RAG1) was synthesized via hydrolyzing the transglycosylation product of RA with 95% of RA converted. RAG1 content in raw reaction mixture was as high as 69.5% of total glycosides, and harvested with a content of 88.2% by simple filtration. The RAG1 exhibited an aqueous solubility of 87 folds of RA or 391 folds of RD at 25 °C. The surface activity of RAG1 solution was higher than RA and invincible to RD. The RAG1 micelles promoted aqueous solubility of idebenone (IDE) up to 500 folds higher at 25 °C. The cumulative release rate of IDE encapsulated in RAG1 micelles was 777.5% or 456.7% higher of that of free IDE in simulated gastric/intestinal fluids in 14 h, respectively. The RAG1-IDE remained the same in 98 days at 25 °C. CONCLUSION The α-linked glucosyl to RA induced higher hydrophilicity and surface activity than that resulted by β-linked glucosyl, making RAG1 not only dramatically raise the aqueous solubility of RA, but also endow IDE folds higher in bioaccessibility, yet making the capsule stable at storage. The results would provide a new edible delivery nanocarrier for encapsulation of hydrophobic bioactive components. © 2021 Society of Chemical Industry.
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EUROPEAN POLYMER JOURNAL
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2019
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IF 3.621
Longfeng Sun,Shuxi Gao,Xuefeng Gui,Lingli Liu,Kai Xu,Huan Liu
Polymer materials, with sulfur as the major part of the backbone structure, are gaining increasing importance because of the large abundance of sulfur and the unique features of polysulfide linkages for modifying material properties. Herein, we introduce polysulfides, which are synthesized from sulfur and monoterpenes, as poly-thiols platform for the crosslinking of epoxy, allowing flexible sulfur constituents incorporate into covalently linked networks. This synthesis can be conducted in a simple, mild, and practical one-pot procedure proceed smoothly in a solvent-free manner with high sulfur utilization to afford sulfur–monoterpene polysulfides (PST) with high sulfur content (up to 58%) and good solubility. The epoxy was cured with PST with imidazole as the catalyst, producing highly sulfur crosslinked thermosets, which is supposed to proceed via a thiol-epoxy reaction mechanism. The resulting thermoset perform good toughness, high transmittance and potential self-healing ability.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 23
·期 11
·3031-3041
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IF 2.531
Deng Yafeng,Ma Zhanhong,Ren Fengzhang,Wang Guangxin
In spite of the TiO 2 compact layer (TCL) being widely used, it still needs more study. This paper took Ni-doped TCLs as the research target, using an innovative two-step method perfectly prepared Ni-doped TCLs with different thicknesses. And then on the basis of Ni-doped TCLs, the TiO 2 nanorod array (TNA) films were successfully prepared. The effects of Ni-doped TCLs with different thicknesses on the morphology, structure, and photoelectric performance of TNA films were investigated. The results indicated that Ni-doped TCLs with appropriate thickness can significantly improve performance of TNA films and obtain satisfactory PCE stability with time. Compared with the TNA films based on Ni:TCL5, Ni:TCL10, and Ni:TCL30, the TNA film with Ni:TCL20 exhibited better comprehensive photoelectric performance, the DSSCs based on this TNA film achieved the highest J sc (10.191 mA cm −2 ), V oc (0.574 V), PCE (4.42%), and the most excellent PCE stability with time.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Juan Xia,Qi Wang,Miaomiao Chen,Wenwen Li,Jie Liu,Jitang Chen,Hai Wu,Suhua Fan
To avoid the evaporation and leakage of the liquid electrolyte and increase the long-term stability of the cell, a strategy was developed to construct bifacial dye-sensitized solar cells employing quasi-solid-state electrolyte (BQDSSCs). Two metal selenides with different morphologies, Co 0.85 Se, which has a foliate structure like the structure of graphene, and Ni 0.85 Se, which has uniform nanoparticle , were synthesized by a facile one-step hydrothermal method . The proposed BQDSSCs were then constructed using the TiO 2 photoanode, polyvinylidene fluoride gel electrolyte, and Co 0.85 Se or Ni 0.85 Se as the counter electrode (CE) electrocatalysts . Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements were performed to investigate the electrochemical behavior of the Co 0.85 Se, Ni 0.85 Se, and Pt CEs. The results showed that the graphene-like Co 0.85 Se material exhibited better operational stability, greater charge-transfer ability, and higher electrocatalytic activity for the reduction of I 3 − than the Ni 0.85 Se nanoparticles. Furthermore, for the BQDSSCs, Co 0.85 Se yielded the highest power conversion efficiencies (PCE) of 8.33% and 4.79% under front and rear irradiations, respectively, in comparison with the front and rear efficiencies of 7.44% and 4.05% for Pt and 7.23% and 4.16% for Ni 0.85 Se CEs, respectively. The BQDSSC device based on the Co 0.85 Se CE exhibited good long-term stability with only a 5% drop in power conversion efficiency after 1000 h of one-sun soaking. Consequently, graphene-like Co 0.85 Se was considered to be an ideal material for constructing cost-effective BQDSSCs.
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ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 47
·1807696
·
IF 15.621
Hongyu Xu,Yuanzhi Jiang,Tingwei He,Saisai Li,Huanhua Wang,Yu Chen,Mingjian Yuan,Jun Chen
Tin-based perovskites have exhibited high potential for efficient photovoltaics application due to their outstanding optoelectrical properties. However, the extremely undesired instabilities significantly hinders their development and further commercialization process. A novel tin-based reduced-dimensional (quasi-2D) perovskites is reported here by using 5-ammoniumvaleric acid (5-AVA + ) as the organic spacer. It is demonstrated that by introducing appropriate amount of ammonium chloride (NH 4 Cl) as additive, highly vertically oriented tin-based quasi-2D perovskite films are obtained, which is proved through the grazing incidence wide-angle X-ray scattering characterization. In particular, this approach is confirmed to be a universal method to deliver highly vertically oriented tin-based quasi-2D perovskites with various spacers. The highly ordered vertically oriented perovskite films significantly improve the charge collection efficiency between two electrodes. With the optimized NH 4 Cl concentration, the solar cells employing quasi-2D perovskite, AVA 2 FA n −1 Sn n I 3 n +1 (< n > = 5), as light absorbers deliver a power conversion efficiency up to 8.71%. The work paves the way for further employing highly vertically oriented tin-based quasi-2D perovskite films for highly efficient and stable photovoltaics.
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TALANTA
·
2019
·
IF 4.916
Nuanfei Zhu,Yuqi Zhu,Jin Wang,Eric Gyimah,Xialin Hu,Zhen Zhang
A novel indirect competitive fluorescence immunoassay based on the quenching of I - to silver clusters (AgNCs) was developed for the highly selective and ultrasensitive detection of sulfamethazine (SMZ). In this system, alkaline phosphatase (ALP) was labeled on the secondary antibody (Ab 2 ). And after a competition step, magnesium ascorbyl phosphate could be catalyzed to produce ascorbic acid under the catalysis of ALP. Subsequently, I 2 was introduced and further reduced to I - in the presence of ascorbic acid, triggering the fluorescence quenching of AgNCs dispersed in isopropanol (IPA) buffer. More importantly, trace I - could lead to an obvious reduction in fluorescence signal, indicating the sensitivity of this method would be greatly improved. Under the optimal condition, this improved method for the SMZ detection has a lower detection of limit (LOD, 0.05000 μg/L) with a wider range (0.1400–71.71 μg/L). After an evaluation, the fluorescence ELISA proposed in this work has satisfactory accuracy and reliability (recoveries, 84.18–118.6%; CV, 2.03–7.64%), illustrating good performance and great potential for the detection of trace SMZ in environmental and biological samples.
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