Science China Materials

http://link.springer.com/journal/40843

List of Papers (Total 459)

The influence of two-dimensional organic adlayer thickness on the ultralow frequency Raman spectra of transition metal dichalcogenide nanosheets

Recently, it has been reported that physisorbed adsorbates can be trapped between the bottom surface of two-dimensional (2D) materials and supported substrate to form 2D confined films. However, the influence of such 2D confined adsorbates on the properties of 2D materials is rarely explored. Herein, we combined atomic force microscopy (AFM), Kelvin probe force microscopy (KPFM...

Sulfur/nickel ferrite composite as cathode with high-volumetric-capacity for lithium-sulfur battery

Low volumetric energy density is a bottleneck for the application of lithium-sulfur (Li-S) battery. The low-density sulfur cooperated with the light-weight carbon substrate realizes electrochemical cycle stability, but leads to worse volumetric energy density. Here, nickel ferrite (NiFe2O4)nanofibers as novel substrate for sulfur not only anchor lithium polysulfides to enhance...

Grain size adjustion in organic field-effect transistors for chemical sensing performance improvement

Various nanostructures of the organic semiconductor (OSC) films have been reported to enhance the organic field-effect transistors (OFETs) sensing performance. However, complicated fabrication processes hinder their applications. In this work, we have effectively enhanced the sensitivity of the OFET-based sensors only by adjusting substrate temperature in OSC preparation and...

A significant enhancement of catalytic performance by adjusting catalyst wettability

摘要固相材料的浸润性(包括亲水性、 疏水性、 亲油性和疏油性)已经成为设计与合成多相催化材料中必须要考虑的因素. 总结近年来的实验结果发现, 催化材料的浸润性对分子的扩散有显著影响, 适宜的浸润性与活性中心的协同是增强催化性能的关键, 这可以通过(i)有效富集反应物、 (ii)快速扩散产物、 (iii)促进形成反应中间体、 (iv)避免副反应和(v)提高催化材料结构等因素来提升多相催化材料的活性、 选择性和反应寿命, 这为设计与制备高效多相催化材料提供了新机遇.

Buildup of Sn@CNT nanorods by in-situ thermal plasma and the electronic transport behaviors

Monocrystal Sn nanorods encapsulated in the multi-walled carbon nanotubes (Sn@CNT NRs), were fabricated by a facile arc-discharge plasma process, using bulk Sn as the raw target and methane as the gaseous carbon source. The typical Sn@CNT NRs are 40–90 nm in diameter and 400–500 nm in length. The CNTs protect the inner Sn nanorods from oxidation. Temperature dependent I–V curve...

Combination of solution-phase process and halide exchange for all-inorganic, highly stable CsPbBr3 perovskite nanowire photodetector

The synthesis of high quality all-inorganic perovskite nanowires needs the harsh conditions, complex process and precision instruments, which are not beneficial to their extensive application. Here, all-inorganic perovskite cesium lead bromine (CsPbBr3) nanowires (NWs) are demonstrated with the combination of solution-phase process and halide exchange technology. A metal...

Constrained-volume assembly of organometal confined in polymer to fabricate multi-heteroatom doped carbon for oxygen reduction reaction

The design and preparation of non-precious metal and carbon-based nanocomposites are critical to the development of efficient catalysts for technologies ranging from water splitting to fuel cell. Here, we present a constrained- volume self-assembly process for the one-step continuous precipitation-induced formation of soft colloidal particles, in which hydrophobic organoferrous...

Graphene oxide membrane for molecular separation: challenges and opportunities

摘要氧化石墨烯作为一种典型二维材料具有单原子层厚度和大量含氧官能团, 可作为高性能分离膜的理想构筑单元, 已成为近年来的研究热点. 通过对氧化石墨烯纳米片的有序组装, 可构筑亚纳米尺寸的分子传质通道, 对水分子、 有机小分子、 气体分子具有快速选择性透过效应, 在水处理、 溶剂纯化和气体分离等膜过程展现出优异的分离性能. 本文重点分析了近期氧化石墨烯膜的突破性进展, 并指出氧化石墨烯膜用于分子分离过程所面临的机遇与挑战.

Flexible and transparent capacitive pressure sensor with patterned microstructured composite rubber dielectric for wearable touch keyboard application

The development of pressure sensors with highly sensitivity, fast response and facile fabrication technique is desirable for wearable electronics. Here, we successfully fabricated a flexible transparent capacitive pressure sensor based on patterned microstructured silver nanowires (AgNWs)/polydimethylsiloxane (PDMS) composite dielectrics. Compared with the pure PDMS dielectric...

PEGylated carbon dot/MnO2 nanohybrid: a new pH/H2O2-driven, turn-on cancer nanotheranostics

The effect of tumor-targeted photodynamic therapy (PDT) was improved by designing nanotheranostics to promote oxygenation in a tumor microenvironment (TME) wherein hypoxia, acidosis, and the elevated levels of H2O2 are three main characteristics. In this study, a carbon dot (CD) PDT agent recently developed by our group was firstly applied as reducing agent to react with...

Evolution of surface of Pd-Rh bimetallic nanocubes and its correlation with CO oxidation

Typically, varying pretreatment conditions probably results in the different catalytic performances for the bimetallic catalysts, and this originates from the surface evolution of catalysts during catalytic process. Hence, it is crucial to correlate surface chemistry (e.g., composition, chemical valence, etc.) of bimetallic nanocatalysts with their corresponding performances upon...

Reveal the growth mechanism in perovskite films via weakly coordinating solvent annealing

In this study, we investigated the nucleation mechanism of perovskite films by employing isopropanol (IPA), a weakly coordinating solvent, to anneal both PbI2 and CH3NH3PbI3 in the sequential deposition and CsPbI3 in the one-step deposition. IPA solvent annealing (IPA SA) of PbI2 films was carried out at different temperatures. The grain size, compactness, roughness and...

High-capacity organic electrode material calix[4] quinone/CMK-3 nanocomposite for lithium batteries

Organic lithium-ion batteries (OLIBs) represent a new generation of power storage approach for their environmental benignity and high theoretical specific capacities. However, it has the disadvantage with regard to the dissolution of active materials in organic electrolyte. In this study, we encapsulated high capacity material calix[4]quinone (C4Q) in the nanochannels of ordered...

Enhanced thermoelectric performance of Na-doped PbTe synthesized under high pressure

Despite an effective p-type dopant for PbTe, the low solubility of Na limits the fully optimization of thermoelectric properties of Na-doped PbTe. In this work, Na-doped PbTe was synthesized under high pressure. The formation of the desired rocksalt phase with substantially increased Na content leads to a high carrier concentration of 3.2×1020 cm−3 for Na0.03Pb0.97Te. Moreover...

Controllable synthesis of two-dimensional tungsten nitride nanosheets as electrocatalysts for oxygen reduction reaction

A facile synthetic strategy was developed for in-situ preparation of two-dimensional (2D) highly crystalline tungsten nitride (WN) nanosheets with controllable morphology as oxygen reduction reaction (ORR) catalysts. The dependence of the crystal structure and morphology ofWN on K2SO4 content, pH, and pyrolysis temperature was thoroughly examined. The electrocatalytic performance...

Robust photoluminescence energy of MoS2/graphene heterostructure against electron irradiation

摘要在许多恶劣的工作环境中, 器件难免会曝露在电子束辐照下. 对于单原子层厚度的二维材料而言, 电子束辐照经常会造成其本征性 能的衰减. 如何避开这一影响对于多功能化的二维异质结器件来讲至关重要. 然而, 电子束辐照对于二维异质结的影响至今仍缺乏充分深 入的研究. 本工作发现利用异质结的堆垛可以阻碍单层二硫化钼(MoS2)由于电子束辐照带来的性能衰退. 通过在MoS2与基底之间插入单 层石墨烯, 在同样剂量的电子束辐照轰击下, 异质结区域的光致发光强度始终大于纯单层MoS2; 而且与纯单层区域明显的发光能量变化相 比, MoS2/石墨烯异质结区域的发光能量具有更佳的稳定性. 这一现象归因于石墨烯的阻隔效应: 由于单层石墨烯的存在抑制了基板对 MoS2的影响. 此外, 我们也系统地揭示了电子束辐照对MoS2...

Moisture-triggered actuator and detector with highperformance: interface engineering of graphene oxide/ethyl cellulose

Actuators that can directly convert other forms of environmental energy into mechanical work offer great application prospects in intriguing energy applications and smart devices. But to-date, low cohesion strength of the interface and humidity responsive actuators primarily limit their applications. Herein, by experimentally optimizing interface of bimorph structure, we build...

A skin-like stretchable colorimetric temperature sensor

Wearable and stretchable physical sensors that can conformally contact on the surface of organs or skin provide a new opportunity for human-activity monitoring and personal healthcare. Particularly, various attempts have been made in exploiting wearable and conformal sensors for thermal characterization of human skin. In this respect, skinmounted thermochromic films show great...

Towards efficient and stable multi-color carbon nanoparticle phosphors: synergy between inner polar groups and outer silica matrix

Nanocarbon as an eco-friendly and abundant material has strong multi-color fluorescence, which makes it a promising candidate for healthy lighting and display. However, the low fluorescence efficiency and poor stability of multi-color carbon nanoparticle (CNP) phosphors are main hurdles that hinder their applications. This work demonstrated efficient and stable multi-color CNP...

Mass transport through metal organic framework membranes

Metal-organic frameworks (MOFs), which are composed of metal nodes and organic ligands, possess crystal phase, ordered well-defined porous structure and large surface area. Since first reported in 1990, MOFs have attracted extensive attention and the fabrication of MOF membranes has expanded their applications and endowed them with a bright future in various fields. The mass...

Carbon nanocomposites with high photothermal conversion efficiency

Photothermal conversion for water vapor generation is a novel strategy and an efficient way to utilize solar energy, which has great potential for water purification and desalination. In this review, the development of photothermal conversion and the classification of absorbers for solar vapor generation systems are presented, especially in recent development of carbon...

Responsive graphene oxide hydrogel microcarriers for controllable cell capture and release

Cell microcarriers have emerged as a powerful cell culture platform in biomedical areas, but their functions are usually limited to simply capturing and proliferating cells, because of the simplicity of their components. Thus, in this study, we developed a new near-infrared (NIR) light-responsive graphene oxide (GO) hydrogel microcarrier system for controllable cell culture. The...

Photoelectrode for water splitting: Materials, fabrication and characterization

Photoelectorchemical (PEC) water splitting is an attractive approach for producing sustainable and environment- friendly hydrogen. An efficient PEC process is rooted in appropriate semiconductor materials, which should possess small bandgap to ensure wide light harvest, facile charge separation to allow the generated photocharges migrating to the reactive sites and highly...

Dendrimer-based NPs in cancer chemotherapy and genetherapy

This review discusses recent studies on dendrimer- based nanoparticles in cancer chemotherapy and genetherapy. In order to achieve the high efficacy and low side effects of chemotherapy and genetherapy, it is essential to combine the unique features of dendrimers and the specific tumor microenvironment to target delivery and control release of therapeutic agents to tumor tissues...