APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Ying Meng,Lin An,Xin Han,Yaogang Li,Chengyi Hou,Qinghong Zhang,Hongzhi Wang
(Ga 1−x Zn x )(N 1−x O x ) has attracted extensive attention in photoelectrochemical (PEC) water splitting for its narrow and controllable band gap recently. For optimizing PEC performance of (Ga 1−x Zn x )(N 1−x O x ) photoanodes, the key points are to tailor its band gap and improve the light harvesting. In this work, black silicon prepared by metal-assisted chemical etching (MACE) is selected as the substrate of photoanodes, owing to its excellent features such as porous structure and much lower reflective index compared to smooth Si wafer. Moreover, a rapid and effective synthesis method is developed to prepare (Ga 1−x Zn x )(N 1−x O x ) nanorods with ZnO content from 16 to 94% on black silicon. As prepared black silicon/(Ga 1−x Zn x )(N 1−x O x ) nanorods were characterized by XRD, FESEM, EDS, XPS, TEM and UV–Vis et al. The (Ga 1−x Zn x )(N 1−x O x ) nanorods with a diameter of 200 nm and an aspect ratio of 15 are directly grown on black silicon as photoanodes, which lead to much better light harvesting and better interface adherence. As a consequence, the photocurrent density of black silicon/(Ga 1−x Zn x )(N 1−x O x ) nanorods photoanode is 55 μA/cm 2 , almost 5.5 times higher than (Ga 1−x Zn x )(N 1−x O x ) nanorods on single-crystal silicon under the same conditions. The result indicates that the (Ga 1−x Zn x )(N 1−x O x ) nanorods grown on black silicon as photoanodes have great potential application in the PEC water splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Miao Kan,Xufang Qian,Taiyang Zhang,Dongting Yue,Yixin Zhao
Here we report a highly active electrochemical water splitting electrode fabricated from colloidal IrOx nanoparticles and nanoporous Si stabilized by conformal TiO2. The colloidal amorphous IrOx nanoparticles are highly active for oxygen evolution reaction. However, their application for water splitting has a dilemma that the traditional annealing process could lead to low activities but the nanoparticles based electrode without annealing usually exhibited low stability. This nanostructured water splitting electrode exhibited both the high activities as the colloidal IrOx nanoparticles and comparable stability as a traditional thermal annealing fabricated electrode. The impedance study revealed that conformal TiO2 significantly inhibits the interface oxidation and maintains the high activity of colloidal IrOx nanoparticles catalysts. The conformal TiO2 interface engineering combined with nanocatalysts would be a promising strategy to achieve balanced activities and stability for water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chuanling Zhou,Qiuyu Mei,Limingming Huang,Tingting Mao,Shuangfu Li,Zhian Wang,Hua Wan,Hui Gu,Kai Han
Photothermal conversion materials are critical in the development of solar-driven interfacial evaporation techniques; however, achieving a high energy conversion efficiency remains challenging owing to the high cost and instability of light-absorbing materials, in addition to the difficulties of simultaneously improving light absorption while suppressing heat loss. A black silicon (Si) powder with a porous structure was prepared by chemical etching of a low-cost commercial micron-sized Al–Si alloy, and a flexible Janus black Si photothermal conversion membrane was constructed. The partially broken spherical particles and porous structure obtained after etching enhanced the refraction of light from the Si powder, imparting the prepared membrane with an average light absorption rate of 95.95% over the solar spectrum. Evaporation from the membrane increased the intermediate water content and reduced the equivalent evaporation enthalpy. The thermal conduction loss was inhibited through a one-dimensional water transport structure, and the membrane achieved a water evaporation rate of 2.17 kg m–2 h–1 and a photothermal efficiency of 94.95% under 1 sun illumination. Benefiting from the broadband absorption and high photothermal efficiency of black Si powder, surface modification of hydrophobic polydimethylsiloxane, and directional salt-out structure design, the evaporation rate of the Janus black Si membrane-based system in a 10% NaCl solution was maintained >2.10 kg m–2 h–1 after 7 days of continuous evaporation cycles. The removal rate of metal ions from simulated seawater and from practical wastewater containing complex heavy metals reached >99.9%, indicating the promising potential of black Si membrane for application in solar-driven interfacial water purification.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Jiangwei Lu,Wenbo Zhuang,Wangfan Yang,Xudong Zhang,Guowen Su,Xiaoxia Gong,Jun Yuan,Jiehe Sui,Yingtang Zhou,Genlin Zhang,Yanfen WAN,Peng Yang
Ultrablack materials are distinguished by their extremely low reflectivity and high absorptivity, which can be used to increase photovoltaic cell efficiency, capture stray light, and design radar camouflage. Black silicon is a type of ultrablack material, the absorptivity of which still has room for improvement. Here, nanostructured black silicon is prepared by a metal-assisted chemical etching method, in which chloroauric acid (HAuCl4) acts as the catalyst. Furthermore, the study demonstrates that due to the deposition of a few layers of PtS2 the number of “hot spots” between the sidewall gaps of bamboo shoot-like protrusions is significantly increased, thereby further improving the absorption of black silicon and enhancing light suppression. The few-layer PtS2 was densely grown on the black silicon by combining the physical vapor deposition (PVD) and the chemical vapor deposition (CVD) methods. Next, the enhanced Raman property of black silicon was explored. These results provide a new idea for the manufacture of excellent photovoltaic and optoelectronic devices in which very high absorption is necessary.
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Functional Biomaterials
·
2023
·Vol. 14
·期 5
·245
·
IF 4.8
Wei Cheng,Xue Wang,Shuai Zou,Mengfei Ni,Zheng Lu,Longfei Dai,Jiandong Su,Kai Yang,Xiaodong Su
Silicon microneedle (Si-MN) systems are a promising strategy for transdermal drug delivery due to their minimal invasiveness and ease of processing and application. Traditional Si-MN arrays are usually fabricated by using micro-electro-mechanical system (MEMS) processes, which are expensive and not suitable for large-scale manufacturing and applications. In addition, Si-MNs have a smooth surface, making it difficult for them to achieve high-dose drug delivery. Herein, we demonstrate a solid strategy to prepare a novel black silicon microneedle (BSi-MN) patch with ultra-hydrophilic surfaces for high drug loading. The proposed strategy consists of a simple fabrication of plain Si-MNs and a subsequent fabrication of black silicon nanowires. First, plain Si-MNs were prepared via a simple method consisting of laser patterning and alkaline etching. The nanowire structures were then prepared on the surfaces of the plain Si-MNs to form the BSi-MNs through Ag-catalyzed chemical etching. The effects of preparation parameters, including Ag+and HF concentrations during Ag nanoparticle deposition and [HF/(HF + H2O2)] ratio during Ag-catalyzed chemical etching, on the morphology and properties of the BSi-MNs were investigated in detail. The results show that the final prepared BSi-MN patches exhibit an excellent drug loading capability, more than twice that of plain Si-MN patches with the same area, while maintaining comparable mechanical properties for practical skin piercing applications. Moreover, the BSi-MNs exhibit a certain antimicrobial activity that is expected to prevent bacterial growth and disinfect the affected area when applied to the skin.Keywords:transdermal drug delivery;silicon microneedle;black silicon;Ag-catalyzed chemical etching;drug loading capacity
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Healthcare Materials
·
2021
·Vol. 10
·期 21
·2101181
·
IF 9.933
Xin Wang,Yin Liu,Meng Zhang,Dong Zhai,Yufeng Wang,Hui Zhuang,Bing Ma,Yu Qu,Xiaopeng Yu,Jingge Ma,Hongshi Ma,Qingqiang Yao,Chengtie Wu
It is common to improve the relevant performance in the field of energy storage materials or catalytic materials by regulating the number of defects. However, there are few studies on the biomaterials containing defects for tissue engineering. Herein, a new type of defect-rich scaffolds, black akermanite (B-AKT) bioceramic scaffolds with micro/nanostructure, the thickness of which is from 0.14 to 1.94 µm, is fabricated through introducing defects on the surface of bioceramic scaffolds. The B-AKT scaffolds have advantages on the degradation rate and the osteogenic capacity over the AKT (Ca 2 MgSi 2 O 7 ) scaffolds due to the surface defects which stimulate the osteogenic differentiation of rabbit bone mesenchymal stem cells via activating bone morphogenetic protein 2 （BMP2） signaling pathway and further promote bone formation in vivo. In addition, the prepared B-AKT scaffolds, the temperature of which can be over 100 °C under the near infrared （NIR） irradiation (0.66 W cm −2 ), possess excellent performance on photothermal and antitumor effects. The work develops an introducing-defect strategy for regulating the biological performance of bioceramic scaffolds, which is expected to be applied in the next generation of bioceramic scaffolds for regenerative medicine.
研究领域:
生物材料学
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组织工程学
·
再生医学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jiang-Hao Lu,Ze Li,Di Zhang,Lu-Hang Song,Xiao-Yan Cai,Liang Mao,Zhi-Qiang Liu,Zhi-Jie Wang,Xiu-Quan Gu,Guo-Dong Yuan
The nano/microstructuring of silicon (Si) via chemical methods has garnered significant attention due to its excellent light-trapping capabilities across a wide spectral range. Current research has predominantly focused on the synthesis of pyramidal-shaped microtextures, which enable two reflections on the surface, while largely overlooking the superior light-trapping potential of inverted pyramid silicon (SiIP) microtextures, which theoretically allow for three reflections. Moreover, there has been limited investigation into the application of inverted pyramid black silicon for solar-driven hydrogen evolution. This study reports the synthesis of uniformly arranged inverted pyramid-textured black silicon using the copper-assisted chemical etching (Cu-ACE) method to enhance the efficiency of solar-driven water splitting for hydrogen production. The formation mechanism and the influence of copper-localized surface plasmon resonance (Cu-LSPR) from Cu nanoparticle (NP) byproducts on photoelectrochemical (PEC) activity were systematically analyzed. To reduce sidewall defects and minimize photogenerated carrier recombination, the surface of the SiIP was treated with tetramethylammonium hydroxide (TMAH). A vertical PN junction was developed through ion implantation to reduce the external bias of the SiIP. Additionally, a uniform TiO₂ antireflective layer was deposited via atomic layer deposition (ALD), reducing the average reflectance of the SiIP-T 4 to 5.78 % over the 300–1100 nm wavelength range. MoSₓ and Pt NPs were electrodeposited to improve the fill factor and enhance HER kinetics. With optimized catalyst loading, the n + p-SiIP-T 4 /TiO₂/Pt 80 mC electrode achieved a photocurrent density of 8.0 mA cm −2 at 0 V vs. RHE, an applied bias photon-to-current efficiency (ABPE) of 0.93 % at 0.24 V vs. RHE, and a double-layer capacitance (Cdl) of 91 μF cm −2 . The onset potential (Von) was positively shifted by ∼1.13 V to 0.49 V vs. RHE compared to a SiIP photocathode, and the photocathode operated continuously at 0 V vs. RHE for 27 h in an acidic electrolyte. These results demonstrate that SiIP has significant potential for PEC hydrogen evolution, with further performance optimization achievable through structural and surface engineering.
研究领域:
材料科学
·
可再生能源
·
表面工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2021
·
IF 2.443
Furu Zhong,Bin Sun,Jun Tang,Juan He,Yu Zhang,Qingjing Luo
Photonic crystals (PhCs) with rough surfaces can considerably enhance the formation of electromagnetic hotspots, which significantly promote surface-enhanced Raman scattering (SERS) activity. In this study, porous silicon PhCs with rough surfaces were synthesized. Deposition of gold nanoparticles on the substrate yielded a SERS substrate with good activity and reproducibility, consequently achieving the ultratrace detection of Rhodamine 6 G (R6G), with a minimum concentration of 10 −15 M. The SERS activity of this substrate was simulated via finite element modeling . The experimental and theoretical results confirmed that the optical characteristics of the “black silicon,” created by inducing a rough surface, and the enhancement of the effective Raman susceptibility, or the time period of the light–matter interaction owing to photonic crystals, played an important role in the enhancement of the overall SERS activity. Furthermore, we demonstrated that the rough-surface porous silicon SERS substrate could be employed to selectively detect ultratrace military explosives containing picric acid (PA) with increased sensitivity. Accordingly, the detection limits of PA and the probe molecule R6G in the Raman spectra were 0.79 nM and 0.24 fM, respectively. This study suggests that the porous silicon PhCs with rough surfaces are promising candidates for ultratrace chemical sensing.
研究领域:
材料科学
·
光学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Pengfei Cheng,Yuanwu Liu,Mario Ziegler,Malte Klingenhof,Dong Wang,Zhang Zhang,Peter Strasser,Peter Schaaf
Photoelectrochemical (PEC) water splitting for H2 production is a possible alternative for fossil energy in the future. However, there exists three problems in PEC water splitting with the silicon (Si) photocathode: poor light absorption of the untreated Si substrate, bad stability in strong acid solution, and poor photocatalytic activity of Si. Here, a strategy of dual interface engineering and photocatalyst deposition is proposed to improve the PEC performance, which consists of fabricating black Si (b-Si) by reactive ion etching, depositing of TiO2 on the b-Si by atomic layer deposition, and growing ReS2 on top of the TiO2 by chemical vapor deposition. Owing to the suitable band alignment of b-Si, TiO2, and ReS2, the ReS2/TiO2/b-Si shows obviously enhanced PEC performance compared to b-Si, TiO2/b-Si, and ReS2/b-Si photocathodes. Results of electrochemical impedance spectroscopy and Mott–Schottky plot analysis demonstrate that the TiO2 layer plays an important role and the charge-transfer kinetics of the system is clearly improved. Transient photocurrent measurements indicate that the ReS2/TiO2/b-Si photocathode has the most remarkable photocurrent response. In addition, the ReS2/TiO2/b-Si photocathode also shows excellent stability after being operated for 25 h.
研究领域:
材料科学
·
电化学
·
可再生能源
·
催化
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）