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排序方式: 共有108条查询结果,搜索用时 15 毫秒
1.
《International Journal of Hydrogen Energy》2022,47(88):37171-37182
In this work, copper sulfide particles are synthesized with different Co doping concentrations such as 0, 1 and 5% at 80 °C by optimizing synthesis times from 1 to 3 h. Copper sulfide particles possess two structural phases of covellite CuS and digenite Cu9S5. The increase in synthesis time from 1 to 3 h increases the Cu9S5 phase growth and changes the morphology from flower to microsphere. The CuS synthesized with 0, 1 and 5% Co dopant concentrations demonstrate flower consisting of agglomerated nanosheets, microsphere and flower like microsphere. The elemental investigation substantiates Co ions presence in CuS microspheres. The A1g (LO) mode intensity is decreased with increase in Co dopant concentration confirming Co incorporation into CuS microsphere. The CuS synthesized with 0, 1, 5% Co dopants exhibit 322 mV, 305 mV and 289 mV to attain 100 mA/cm2 in 1 M KOH seawater. The CuS synthesized with 5% Co dopant demonstrates higher double layer capacitance (Cdl) of 173.9 mFcm?2 and lower charge transfer resistance (Rct) of 6.07 Ω with 78.84% retention after 10 h continuous stability than that of the other pristine (118.3 mFcm?2, 13.72 Ω) and 1% Co doped CuS microsphere (165.7 mFcm?2, 8.55 Ω) indicating more surface active site and rapid charge carrier transport, respectively. 相似文献
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《International Journal of Hydrogen Energy》2019,44(59):30965-30973
CuS/CdS(H)/CdS(C) photocatalysts were synthesized via the hydrothermal method by employing thiourea, Cd(CH3COO)2·3H2O and copper 1,4-benzenedicarboxylate MOF (CuBDC). The photocatalysts were characterized by XRD, XPS, BET, TEM and UV–vis diffuse reflectance spectra. Interestingly, hexagonal CdS (CdS(H)) and cubic CdS (CdS(C)) were formed with phase junctions in one step when CuBDC was introduced in the synthesis process, in addition, CuS nanoparticles were deposited on CdS. However, only hexagonal CdS was obtained without CuBDC. It demonstrated that CuBDC was not only the precursor of CuS but also the structural modifier for CdS. With the reduction of re-combination of photo-induced electrons and holes caused by phase junctions and the enhancement of visible-light absorptions due to the loading of CuS, all CuS/CdS(H)/CdS(C) photocatalysts had higher photocurrent densities under visible-light irradiation, and consequently the higher rates of H2 production than pure CdS(H). Typically, the catalyst with 2.89 wt% of Cu showed a highest rate of H2 evolution at 2042 μmol/g/h. 相似文献
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Copper sulphide (CuS) nanomaterials with interesting morphology were synthesised using copper nitrate trihydrate, thiourea and water as a solvent by a simple hydrothermal route. A systematic investigation was carried out to investigate the effect of reaction time (5, 16 and 24?h) at 150°C on the morphology of the materials. Without the use of any template or additives, shape controlled synthesis of CuS nanocrystallites were achieved. The possible mechanism for the formation of the various nanostructures of CuS in this system is discussed. The prepared materials were characterised by X-ray diffraction, field emission scanning electron microscopy (FE-SEM) and DRS-UV–Vis absorption analysis. The UV–Vis spectrum shows that it is the promising material which can absorb in the visible region and hence could be used for photocatalytic applications. In addition, the electrochemical characteristic of the synthesised material was investigated by cyclic voltammetric analysis, which shows that CuS could be used for electrocatalytic applications. 相似文献
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以铜粉和硫粉为原料,在摩尔比为0.48:0.32:0.2的乙酰胺,尿素,硝酸铵三元低共熔溶剂中通过单质直接反应合成了纳米CuS。通过XRD、SEM、EDS和UV-Vis DRS等手段进行了表征,XRD、EDS表明产品为纯净的CuS晶体。SEM显示产品是由纳米片交错连结而成的球体结构。UV-Vis DRS表明产品的禁带宽度为1.86 e V。测试产品的光催化降解染料性能,光照100 min后亚甲基蓝(10 mg/L)的降解率可达到100%。表明CuS具有良好的光催化活性。 相似文献
7.
高压下材料的电导率研究 总被引:1,自引:0,他引:1
阐述了在高压下研究材料电导率随压力变化情况的分析方法.以半导体CuS为例,用阻抗谱法分析了其微观电传导机制.研究表明,电导率对频率具有很强的依赖性.材料的电导率随压力的变化而发生变化. 相似文献
8.
设计出了研究夹杂物在针状铁素体形核过程中的作用的物理模拟试验方法。研究了CuS、Al2 O3 和Al2 O3 ·CuS在针状铁素体形核过程中的作用 ,用数字式金相显微镜观察了夹杂物界面附近区域的金相显微组织变化 ,用电子探针分析仪对夹杂物界面附近微区的化学成分进行了分析。研究结果表明 ,在热循环作用下 ,CuS和Al2 O3 ·CuS能使夹杂物与金属交界面附近出现贫Mn区 ,CuS与Al2 O3 ·CuS具有诱导针状铁素体形核的能力 ;而Al2 O3 不能使夹杂物与金属交界面附近区域的化学成分发生变化 ,Al2 O3不具有诱导针状铁素体形核的能力。夹杂物表面的CuS在针状铁素体形核过程中起着重要作用 相似文献
9.
Dasari Ayodhya M. Venkatesham A. Santoshi kumari G. Bhagavanth Reddy D. Ramakrishna 《Journal of Experimental Nanoscience》2016,11(6):418-432
A green method for the solvothermal synthesis of copper sulphide nanoparticles (CuS NPs) using xanthan gum as a capping agent was developed. The CuS NPs were characterised by scanning electron microscopy, transmission electron microscopy (TEM), X-ray diffraction, Brunauer–Emment–Teller, zeta analysis, thermal gravimetric– differential thermal analysis, Fourier transform infrared and UV–visible absorption spectra. These characterisations together determine the composition, structural, thermal and optical properties. The UV–visible spectrum had a broad absorption in the visible range. The particle size of the products was observed by TEM in the range of 8–20 nm. The photocatalytic performance of the CuS NPs was evaluated for the degradation of organic dyes (methylene blue, rhodamine B, eosin Y and congo red) under irradiation of solar, visible and UV lights. The CuS NPs showed good photocatalytic activity. Kinetic analyses indicate that the photodegradation rates of dyes usually follow pseudo-first-order kinetics for degradation mechanisms. 相似文献
10.
目的获得结晶好、连续均匀的CuS薄膜。方法采用电沉积方法制备CuS薄膜,研究络合剂、硫源及铜硫离子比例对镀液电化学性能的影响,分析不同沉积电位下所得薄膜的相组成。结果柠檬酸钠的络合效果最好,EDTA最差;硫代硫酸钠作为硫源时,其还原电位较硫脲为硫源时正,氧化电位较负,水平距离值较小,更容易实现共沉积;铜硫离子比例为1时,施镀最合适。沉积电位为-0.8 V时,薄膜的XRD图谱中有氧化亚铜的衍射峰;当沉积电位在-0.9 V时,生成了Cu2S相;沉积电位在-0.9~-1.2V时,生成了目标产物CuS,并且-1.2 V时的衍射峰强度比较高,结晶良好。结论最佳沉积条件如下:柠檬酸钠为络合剂,硫代硫酸钠为硫源,铜硫离子比为1,沉积电位为-1.2 V。 相似文献