journal
https://read.qxmd.com/read/39011983/constructing-favorable-microenvironment-on-copper-grain-boundaries-for-co-2-electro-conversion-to-multicarbon-products
#21
JOURNAL ARTICLE
Yan Kong, Hengpan Yang, Xinmei Jia, Da Wan, Yilei Zhang, Qi Hu, Chuanxin He
The electrochemical CO2 reduction reaction (eCO2 RR) to multicarbon chemicals provides a promising avenue for storing renewable energy. Herein, we synthesized small Cu nanoparticles featuring enriched tiny grain boundaries (RGBs-Cu) through spatial confinement and in situ electroreduction. In-situ spectroscopy and theoretical calculations demonstrate that small-sized Cu grain boundaries significantly enhance the adsorption of the *CO intermediate, owing to the presence of abundant low-coordinated and disordered atoms...
July 16, 2024: Nano Letters
https://read.qxmd.com/read/39008655/functionality-expansion-of-guided-mode-radiation-via-on-chip-metasurfaces
#22
JOURNAL ARTICLE
Lin Deng, Ziqiang Cai, Yongmin Liu
On-chip metasurfaces play a crucial role in bridging the guided mode and free-space light, enabling full control over the wavefront of scattered free-space light in an optimally compact manner. Recently, researchers have introduced various methods and on-chip metasurfaces to engineer the radiation of guided modes, but the total functions that a single metasurface can achieve are still relatively limited. In this work, we propose a novel on-chip metasurface design that can multiplex up to four distinct functions...
July 15, 2024: Nano Letters
https://read.qxmd.com/read/39008627/ionic-pumping-effect-at-the-tailored-mesoporous-carbon-interface-for-an-extra-stable-lithium-ion-battery-at-low-temperatures
#23
JOURNAL ARTICLE
Mengjia Yu, Bingfang Wang, Haoyu Ma, Suparada Kamchompoo, Baogang Zhao, Siriporn Jungsuttiwong, Phornphimon Maitarad, Shuai Yuan, Liyi Shi, Yin Fang, Dongyuan Zhao, Yingying Lv
Ion transportation at the interface significantly influences the electrochemical performance of the lithium ion battery, especially at high rates and low temperatures. Here, we develop a controlled self-assembly strategy for constructing a mesoporous carbon nanolayer with a uniform pore size and varied thicknesses on the two-dimensional monolayer MXene substrate. On the basis of the excellent electron conductivity of MXene, the mesoporous carbon layer is found with a voltage-driven ion accumulation effect, acting as an "ionic pump"...
July 15, 2024: Nano Letters
https://read.qxmd.com/read/39008523/pre-adsorbed-h-mediated-electrochemiluminescence
#24
JOURNAL ARTICLE
Mengzhen Xi, Yu Wu, Jingshuai Li, Hengjia Wang, Ying Qin, Canglong Wang, Liuyong Hu, Wenling Gu, Chengzhou Zhu
In conventional electrochemiluminescence (ECL) systems, the presence of the competitive cathodic hydrogen evolution reaction (HER) in aqueous electrolytes is typically considered to be a side reaction, leading to a reduced ECL efficiency and stability due to H2 generation and aggregation at the electrode surface. However, the significant role of adsorbed hydrogen (H*) as a key intermediate, formed during the Volmer reaction in the HER process, has been largely overlooked. In this study, employing the luminol-H2 O2 system as a model, we for the first time demonstrate a novel H*-mediated coreactant activation mechanism, which remarkably enhances the ECL intensity...
July 15, 2024: Nano Letters
https://read.qxmd.com/read/39007901/modulating-carrier-dynamics-in-pdse-2-the-role-of-pressure-in-electronic-and-phononic-interactions
#25
JOURNAL ARTICLE
Xiaowei Wang, Guangming Niu, Jutao Jiang, Laizhi Sui, Xiangyu Zeng, Xin Liu, Yutong Zhang, Guorong Wu, Kaijun Yuan, Xueming Yang
PdSe2 is a puckered transition metal dichalcogenide that has been reported to undergo a two-dimensional to three-dimensional structural transition under pressure. Here, we investigated the electronic and phononic evolution of PdSe2 under high pressure using pump-probe spectroscopy. We observed the electronic intraband and interband transitions occurring in the d orbitals of Pd, revealing the disappearance of the Jahn-Teller effect under high pressure. Furthermore, we found that the decay rates of interband recombination and intraband relaxation lifetimes change at 3 and 7 GPa, respectively...
July 15, 2024: Nano Letters
https://read.qxmd.com/read/39007862/in-situ-local-imaging-of-ferromagnetism-and-superconductivity-in-rbeufe-4-as-4
#26
JOURNAL ARTICLE
Huiyuan Man, Yusuke Iguchi, Jin-Ke Bao, Duck Young Chung, Mercouri G Kanatzidis
The coexistence of superconductivity and ferromagnetism is an intrinsically interesting research focus in condensed matter physics, but the study is limited by low superconducting ( T c ) and magnetic ( T m ) transition temperatures in related materials. Here, we used a scanning superconducting quantum interference device to image the in situ diamagnetic and ferromagnetic responses of RbEuFe4 As4 with high T c and T m . We observed significant suppression of the superfluid density in the vicinity of the magnetic phase transition, signifying fluctuation-enhanced magnetic scatterings between Eu spins and Fe 3d conduction electrons...
July 15, 2024: Nano Letters
https://read.qxmd.com/read/39007697/regulating-planarized-intramolecular-charge-transfer-for-efficient-single-phase-white-light-emission-in-undoped-metal-organic-framework-nanocrystals
#27
JOURNAL ARTICLE
Yunfeng Yang, Yixuan Wang, Fu-Quan Bai, Shun-Xin Li, Qing Yang, Weibin Wang, Xinyi Yang, Bo Zou
The technology of combining multiple emission centers to exploit white-light-emitting (WLE) materials by taking advantage of porous metal-organic frameworks (MOFs) is mature, but preparing undoped WLE MOFs remains a challenge. Herein, a pressure-treated strategy is reported to achieve efficient white photoluminescence (PL) in undoped [Zn(Tdc)(py)] n nanocrystals (NCs) at ambient conditions, where the Commission International del'Eclairage coordinates and color temperature reach (0.31, 0.37) and 6560 K, respectively...
July 15, 2024: Nano Letters
https://read.qxmd.com/read/39007530/programming-of-in-situ-tumor-vaccines-via-supramolecular-nanodrug-hydrogel-composite-and-deformable-nanoadjuvant-for-cancer-immunotherapy
#28
JOURNAL ARTICLE
Shuaiqi Shao, Ziyang Cao, Zekai Xiao, Boya Yu, Lingwei Hu, Xiao-Jiao Du, Xianzhu Yang
The development of in situ tumor vaccines offers promising prospects for cancer treatment. Nonetheless, the generation of plenary autologous antigens in vivo and their codelivery to DC cells along with adjuvants remains a significant challenge. Herein, we developed an in situ tumor vaccine using a supramolecular nanoparticle/hydrogel composite (ANPMTO /ALCD) and a deformable nanoadjuvant (PPER848 ). The ANPMTO /ALCD composite consisted of β-cyclodextrin-decorated alginate (Alg- g -CD) and MTO-encapsulated adamantane-decorated nanoparticles (ANPMTO ) through supramolecular interaction, facilitating the long-term and sustained production of plenary autologous antigens, particularly under a 660 nm laser...
July 15, 2024: Nano Letters
https://read.qxmd.com/read/39007508/nanoscale-visualization-of-symmetry-breaking-electronic-orders-and-magnetic-anisotropy-in-a-kagome-magnet-ymn-6-sn-6
#29
JOURNAL ARTICLE
Liangguang Jia, Yaoyao Chen, Guoyuan Yang, Wenxin Lv, Can Zhang, Lili Zhou, Xu Han, Quanzhen Zhang, Huixia Yang, Hechang Lei, Yu Zhang, Hong-Jun Gao, Yeliang Wang
A kagome lattice hosts a plethora of quantum states arising from the interplay between nontrivial topology and electron correlations. The recently discovered kagome magnet RMn6 Sn6 (R represents a rare-earth element) is believed to showcase a kagome band closely resembling textbook characteristics. Here, we report the characterization of local electronic states and their magnetization response in YMn6 Sn6 via scanning tunneling microscopy measurements under vector magnetic fields. Our spectroscopic maps reveal a spontaneously trimerized kagome electronic order in YMn6 Sn6 , where the 6-fold rotational symmetry is disrupted while translational symmetry is maintained...
July 15, 2024: Nano Letters
https://read.qxmd.com/read/39007505/reprogramming-tumor-associated-macrophages-with-a-se-based-core-satellite-nanoassembly-to-enhance-cancer-immunotherapy
#30
JOURNAL ARTICLE
Xia Zhang, Guocheng Li, Jiaqi Yin, Wei Pan, Yanhua Li, Na Li, Bo Tang
Tumor-associated macrophages (TAMs), as the most prevalent immune cells in the tumor microenvironment, play a pivotal role in promoting tumor development through various signaling pathways. Herein, we have engineered a Se@ZIF-8 core-satellite nanoassembly to reprogram TAMs, thereby enhancing immunotherapy outcomes. When the nanoassembly reaches the tumor tissue, selenium nanoparticles and Zn2+ are released in response to the acidic tumor microenvironment, resulting in a collaborative effort to promote the production of reactive oxygen species (ROS)...
July 15, 2024: Nano Letters
https://read.qxmd.com/read/39007447/-peapod-like-fiber-network-a-universal-strategy-for-composite-solid-electrolytes-to-inhibit-lithium-dendrite-growth-in-solid-state-lithium-metal-batteries
#31
JOURNAL ARTICLE
Wanqing Fan, Jingren Gou, Ying Huang, Kaihang She, Meng Yu, Zheng Zhang
Solid-state lithium metal batteries (SSLMBs) are a promising energy storage technology, but challenges persist including electrolyte thickness and lithium (Li) dendrite puncture. A novel three-dimensional "peapod-like" composite solid electrolyte (CSEs) with low thickness (26.8 μm), high mechanical strength, and dendrite inhibition was designed. Incorporating Li7 La3 Zr2 O12 (LLZO) enhances both mechanical strength and ionic conductivity, stabilizing the CSE/Li interface and enabling Li symmetric batteries to stabilize for 3000 h...
July 15, 2024: Nano Letters
https://read.qxmd.com/read/38997245/separators-modified-with-ultrathin-montmorillonite-polymer-nanocoatings-achieve-dendrite-free-lithium-deposition-at-high-current-densities
#32
JOURNAL ARTICLE
Ying Zhang, Yicheng Hua, Guoqiang Zhao, Feiyue Tu, Tianbao Li, Mitch Guijun Li, Liangjie Fu, Caihong Yang, Aidong Tang, Huaming Yang
Fatal dendritic growth in lithium metal batteries is closely related to the composition and thickness of the modified separator. Herein, an ultrathin nanocoating composed of monolayer montmorillonite (MMT), poly(vinyl alcohol) (PVA) on a polypropylene separator is prepared. The MMT was exfoliated into monolayers (only 0.96 nm) by intercalating PVA under ultrasound, followed by cross-linking with glutaraldehyde. The thickness of the nanocoating on the polypropylene separator, as determined using the pull-up method, is only 200-500 nm with excellent properties...
July 12, 2024: Nano Letters
https://read.qxmd.com/read/38996059/tuning-exciton-emission-via-ferroelectric-polarization-at-a-heterogeneous-interface-between-a-monolayer-transition-metal-dichalcogenide-and-a-perovskite-oxide-membrane
#33
JOURNAL ARTICLE
Jaehong Choi, Kevin J Crust, Lizhong Li, Kihong Lee, Jialun Luo, Jae-Pil So, Kenji Watanabe, Takashi Taniguchi, Harold Y Hwang, Kin Fai Mak, Jie Shan, Gregory D Fuchs
We demonstrate the integration of a thin BaTiO3 (BTO) membrane with monolayer MoSe2 in a dual-gate device that enables in situ manipulation of the BTO ferroelectric polarization with a voltage pulse. While two-dimensional (2D) transition metal dichalcogenides (TMDs) offer remarkable adaptability, their hybrid integration with other families of functional materials beyond the realm of 2D materials has been challenging. Released functional oxide membranes offer a solution for 2D/3D integration via stacking. 2D TMD excitons can serve as a local probe of the ferroelectric polarization in BTO at a heterogeneous interface...
July 12, 2024: Nano Letters
https://read.qxmd.com/read/38996000/exceptional-rate-performances-of-li-rich-mn-based-cathodes-enabled-by-boron-based-additives-driven-self-optimized-interface
#34
JOURNAL ARTICLE
Kang Ma, Yu Cao, Shaojie Zhang, Yiming Zhang, Siyu Fang, Xinpeng Han, Fengmin Jin, Jie Sun
Li-rich Mn-based cathode material (LRM), as a promising cathode for high energy density lithium batteries, suffers from severe side reactions in conventional lithium hexafluorophosphate (LiPF6 )-based carbonate electrolytes, leading to unstable interfaces and poor rate performances. Herein, a boron-based additives-driven self-optimized interface strategy is presented to dissolve low ionic conductivity LiF nanoparticles at the outer cathode electrolyte interface, leading to the optimized interfacial components, as well as the enhanced Li ion migration rate in electrolytes...
July 12, 2024: Nano Letters
https://read.qxmd.com/read/38995813/sono-blasting-triggered-cascading-amplification-of-oxidative-stress-for-enhanced-interventional-therapy-of-hepatocellular-carcinoma
#35
JOURNAL ARTICLE
Dong Li, Kexin Zhang, Kaiyang Wang, Renmiao Peng, Xijian Liu, Yamei Miao, Yuanpei Lan, Ruizhi Wang, Lile Dong, Yu Luo
Interventional therapy is widely regarded as a highly promising treatment approach for nonsurgical liver cancer. However, the development of drug resistance and tolerance to hypoxic environments after embolization can lead to increased angiogenesis, enhanced tumor cell stemness, and greater invasiveness, resulting in metastasis and recurrence. To address these challenges, a novel approach involving the use of lecithin and DSPE-PEG comodified Ca2+ loaded (NH4 )2 S2 O8 (LDCNSO) drug in combination with transcatheter arterial embolization (TAE) has been proposed...
July 12, 2024: Nano Letters
https://read.qxmd.com/read/38995696/lattice-distortion-promotes-incipient-plasticity-in-multiprincipal-element-alloys
#36
JOURNAL ARTICLE
Luling Wang, Yang Cao, Yonghao Zhao
Multiprincipal element alloys usually exhibit earlier pop-in events than pure metals and dilute solid solutions during nanoindentation experiments. To understand the origin of this phenomenon, large-scale atomic simulations of nanoindentation were performed on a series of metallic materials to investigate the underlying physics of incipient plasticity at the nanoscale. Statistical result shows that lattice distortion δ and normalized critical pressure p c / E s follow a power-law relationship. Via quantitative analysis on the relative positions of the atoms within the nearest neighbor shell, the physical origin of premature incipient plasticity is revealed as severe lattice distortion induces large relative atomic displacement, so only a small indentation strain is required to meet the critical displacement threshold that triggers incipient plasticity...
July 12, 2024: Nano Letters
https://read.qxmd.com/read/38994924/strong-vertical-piezoelectricity-and-broad-ph-value-photocatalyst-in-ferroelastic-y-2-se-2-brf-monolayer
#37
JOURNAL ARTICLE
Qi-Wen He, Jun-Hui Wang, Dan-Yang Zhu, Dai-Song Tang, Zengtao Lv, Feng Guo, Xiao-Chun Wang
With the development of miniaturized devices, there is an increasing demand for 2D multifunctional materials. Six ferroelastic semiconductors, Y2 Se2 XX' ( X , X' = I, Br, Cl, or F; X ≠ X' ) monolayers, are theoretically predicted here. Their in-plane anisotropic band structure, elastic and piezoelectric properties can be switched by ferroelastic strain. Moderate energy barriers can prevent the undesired ferroelastic switching that minor interferences produce. These monolayers exhibit high carrier mobilities (up to 104 cm2 V-1 s-1 ) with strong in-plane anisotropy...
July 12, 2024: Nano Letters
https://read.qxmd.com/read/38994869/an-electrochemically-programmable-metasurface-with-independently-controlled-metasurface-pixels-at-optical-frequencies
#38
JOURNAL ARTICLE
Robin Kaissner, Benjamin Renz, Frank Neubrech, Yueqiang Hu, Na Liu
Metasurfaces have revolutionized optical technologies by offering powerful, compact, and versatile solutions to control light. Conducting polymers, characterized by their conjugated molecular structures, facilitate charge transport and exhibit interesting electrical, optical, and mechanical properties. Integrating conducting polymers with optical metasurfaces can unlock new opportunities and functionalities in modern optics. In this work, we demonstrate an electrochemically programmable metasurface with independently controlled metasurface pixels at optical frequencies...
July 12, 2024: Nano Letters
https://read.qxmd.com/read/38991547/mass-transport-limitations-in-plasmonic-photocatalysis
#39
JOURNAL ARTICLE
Olivier Henrotte, Štěpán Kment, Alberto Naldoni
The interpretation of mechanisms governing hot carrier reactivity on metallic nanostructures is critical, yet elusive, for advancing plasmonic photocatalysis. In this work, we explored the influence of the diffusion of molecules on the hot carrier extraction rate at the solid-liquid interface, which is of fundamental interest for increasing the efficiency of photodevices. Through a spatially defined scanning photoelectrochemical microscopy investigation, we identified a diffusion-controlled regime hindering the plasmon-driven photochemical activity of metallic nanostructures...
July 11, 2024: Nano Letters
https://read.qxmd.com/read/38991210/a-cost-effective-and-chemical-recycling-approach-for-facile-preparation-of-regenerated-cellulose-materials
#40
JOURNAL ARTICLE
Xiaodi Liu, Yichen Tian, Li Wang, Lei Chen, Zhiping Jin, Qiang Zhang
Cellulose is difficult to melt or dissolve. The dissolution and regeneration process paves the way to convert cellulose into diverse forms but still suffers from high costs and environmental pollution. Here, we developed a method that uses aqueous alkali to efficiently dissolve cellulose at a temperature above 0 °C in minutes for fabricating regenerated cellulose. Cellulose was modified with minimal carboxymethyl groups to weaken the intermolecular interaction and improve its dissolution. The modified cellulose can be commercially obtained from carboxymethyl cellulose manufacturing with low cost and high quality...
July 11, 2024: Nano Letters
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