Journal of Physical Chemistry C
·
2017
·
IF 4.536
Ruili Zhang,Jinjun Ren,Xinqiang Yuan,Yun Cui,Lei Zhang,Long Zhang
Glasses in the system xBi2O3–(100 – x)NaPO3 were prepared using transitional melting–quenching and characterized using solid state nuclear magnetic resonance (SSNMR), X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FT-IR). The addition of Bi2O3 results in the depolymerization of the phosphorus chain and the formation of Q(n) (n = 0, 1, 2) phosphorus species, where n represents the number of P–O–P bonds that can be quantified using 31P magic angle spinning (MAS) NMR and constant-time double-quantum based dipolar recoupling effects nuclear alignment reduction (CT-DQ-DRENAR). The 23Na{31P}, 31P{23Na}, and XPS results consistently prove that both Na+ and Bi3+ ions are bounded by phosphorus tetrahedron [PO4]3–. Unlike other trivalent ions such as Ga3+ and Al3+, which connect with the phosphorus tetrahedron by corner-sharing, Bi3+ ions were first proved to share edge with the phosphorus tetrahedron by the analysis of 31P spectra, taking the charge balance and bond valence consideration into account. Such a difference in connectivity results in significant structural differences.
研究领域:
材料科学
·
物理学
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DOI
高影响因子
Crystals
·
2019
·Vol. 9
·期 3
·130
·
IF 2.061
Lu Zhou,Xuefeng Chu,Yaodan Chi,Xiaotian Yang
In this study the effects of 1-Octadecanethiol (ODT, 1-CH3[CH2]17SH) passivation on GaAs (100) surface and GaAs/Al2O3MOS capacitors are investigated. The results measured by X-ray photoelectric spectroscopy (XPS), Raman spectroscopy and scan electron microscopy (SEM) show that the ODT passivation can obviously suppress the formation of As-O bonds and Ga-O bonds on the GaAs surface and produce good surface morphology at the same time, and especially provide better protection against environmental degradation for at least 24 h. The passivation time is optimized by photoluminescence (PL), and the maximum enhancement of PL intensity was 116%. Finally, electrical property of a lower leakage current was measured using the metal-oxide-semiconductor capacitor (MOSCAP) method. The results confirm the effectiveness of ODT passivation on GaAs (100) surface.Keywords:GaAs;passivation;XPS;RAMAN;PL
研究领域:
材料科学
·
半导体物理
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DOI
高影响因子
Journal of Coatings Technology and Research
·
2013
·Vol. 10
·期 5
·621-629
·
IF 1.094
Xiong Jinsu,Jin Yunquan,Shentu Baoqing,Weng Zhixue
Poly[1,2-propylene glycol-3-(2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptoxy)]phthalate (PDFP) was prepared by the reaction of phthalic anhydride, epichlorohydrin, and 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl glycidyl ether (DFGE). The structure of PDFP was characterized with 1 H-NMR, 19 F-NMR, FTIR and the wettability of water and oil on cured PDFP coatings was investigated by contact angle meter. The results showed that the contact angle of water and diiodomethane on cured coatings increased with the increase of the fluorine content and could maximally attain 108° and 69°, respectively. At a fluorine content of 0.75%, the surface energy was 21.1 mJ/m 2 . X-ray photoelectron spectroscopic (XPS) analysis showed that the surface F/C atomic ratio was much higher than the overall F/C molar ratio, indicating that the fluoroalkyl groups in PDFP had enriched on the coating surface. It was also found that the fluorinated polyester with longer fluoroalkyl groups had the higher tendency to enrich on the coating surface.
研究领域:
材料科学
·
化学
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DOI
高影响因子
Crystals
·
2021
·Vol. 11
·期 5
·547
·
IF 2.589
Zengguang Tang,Liujiang Zhang,Zhenhuang Su,Zhen Wang,Li Chen,Chenyue Wang,Guoping Xiao,Xingyu Gao
In this article, CsPbI2Br perovskite thin films were spin-coated on FTO, on which CuPc was deposited by thermal evaporation. The electronic structure at the CsPbI2Br/CuPc interface was examined during the CuPc deposition by in situ X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) measurements. No downward band bending was resolved at the CsPbI2Br side, whereas there is ~0.23 eV upward band bending as well as a dipole of ~0.08 eV identified at the molecular side. Although the hole injection barrier as indicated by the energy gap from CsPbI2Br valance band maximum (VBM) to CuPc highest occupied molecular orbital (HOMO) was estimated to be ~0.26 eV, favoring hole extraction from CsPbI2Br to CuPc, the electron blocking barrier of ~0.04 eV as indicated by the offset between CsPbI2Br conduction band minimum (CBM) and CuPc lowest unoccupied molecular orbital (LUMO) is too small to efficiently block electron transfer. Therefore, the present experimental study implies that CuPc may not be a promising hole transport material for high-performance solar cells using CsPbI2Br as active layer.
研究领域:
材料科学
·
光伏器件
·
表面科学
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DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Jingfeng Wang,Fei Jiao,Di Zhang,Meixia Chang,Lingbo Cai,Yunlong Li,Cao Wang,Shugang Tan,Qiang Jing,Bo Liu,Dong Qian
The relationship between the doping position of Nb in Bi 2 Se 3 and its superconductivity is investigated by XPS, magnetic measurement and transport measurement. It is found that for Nb x Bi 2 Se 3 , the main impurity phase comes from BiNbSe 3 . Superconducting volume fraction of Nb doped Bi 2 Se 3 increases with the ratio of Nb inserted in the van der Waals layers. The van der Waals-layer-position doped Nb may lead to superconductivity in Bi 2 Se 3 . This work may stimulate further investigation on topological superconductivity mechanism of Nb x Bi 2 Se 3 .
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Hongkun Niu,Cong Wang,Bingliang Gao,Zhiwei Liu,Ruifeng An,Youjian Yang
The Anode Effect (AE) in primary aluminum production is a critical issue for the industry, contributing significantly to greenhouse gas emissions and current efficiency. This study investigates the role of the bubble layer and fluorocarbon (CFₓ) passivation film on a 50 cm² industrial carbon anode during AE initiation, using in-situ video observation in a high-temperature transparent electrolytic cell at 940 °C, combined with non-in situ X-ray photoelectron spectroscopy (XPS) and gas chromatography techniques. Additionally, it analyzes the reasons for gas changes before and after AE. Video observations combined with XPS analysis confirm that the bubble-free region formed during the electrolysis stage contains a complex high-resistance and insulating CF x film, which is the root cause of AE. CF x cannot continuously generate and cover the electrode surface, nor can it quickly trigger new AE again. The bubble layer covering the anode is a secondary phenomenon resulting from the deterioration of wettability caused by CF x . CF x plays a central role in impeding current flow, increasing cell voltage, and halting electrochemical activity in the affected areas. The composition of CF x can be altered by AE, leading to variations in back electromotive force(BEMF). Gas chromatography detection confirms that even after AE, the partial CF x film remains on the anode surface, where it forms a "memory effect" and decomposes at high temperatures to produce PFC. In industrial testing, the changes in anode gas composition before and after AE can be attributed to the CF x film formed on the anode surface and its degree of fluorination. This study suggests that targeting CFₓ layer formation, rather than bubble layer dynamics, could be a more effective strategy for reducing AE frequency, enhancing energy efficiency, and minimizing emissions in aluminum smelting. These insights offer a refined understanding of AE mechanisms for improving the sustainability and stability of industrial aluminum production processes.
研究领域:
材料科学
·
冶金工程
·
化学工程
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Chao Ren,Hongtao Wang,Junfeng Ji,Wei Li
Calcination is an effective way to improve the F − adsorption capacity of layered double hydroxide (LDH) materials, however, a molecular scale understanding of the enhanced defluoridation capability of calcined LDHs (CLDH) is lacking. This study investigated the mechanisms of F − adsorption by CLDH using 19 F solid-state NMR, X-ray photoelectron spectroscopy (XPS), and high-resolution TEM . Under calcination process, LDH underwent three periods: surface dehydration below 200 °C, structural dehydroxylation at 200–400 °C, and release of interlayer carbonate groups above 400 °C. Additionally, XPS and XRD characterization showed that CLDH could not recover to the original structural symmetry even after rehydration and reconstitution. The F − affinity was greatly enhanced for the calcined LDH, especially at high pH. At pH 10, the adsorption capacity could reach 22.0 mg F − /g for CLDH (500 °C calcined), about 6 times larger than that of LDH. The XRD analyses revealed that the F-adsorbed CLDH had a poorer crystalline degree as the calcination temperature increased, consistent with the TEM observation of abundant defects and Mg/Al oxides on the CLDH sheets. 19 F solid-state NMR spectra of the CLDH after F − adsorption showed that the formation of surface Al–F is the predominant F − adsorption mode at pH 7, whereas the Mg–F local coordination mode is the pronounced F − adsorption mechanism under alkaline conditions (pH 10). The present study provided a comprehensive understanding of CLDH in F − adsorption and suggested that calcination is a promising treatment for promoting the efficacy of polluted anion scavenging.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Zhaohui Xu,Yinyu Zhang,Yeping Wu,Xiaolin Lu
The formation of the interfacial adhesion between an epoxy adhesive and a substrate was normally accompanied by the epoxy curing process on the substrate. Although the debate on the formation mechanism of the interfacial adhesion is still ongoing, this issue can causally be resolved by studying the interfacial structural formation between the epoxy adhesive and the substrate. Herein, to reveal the interfacial structural formation of a representative formula composed of epoxy (digylcidyl ether of biphenyl A, DGEBA) and amine hardener (2,2′-(ethylenedioxy) diethylamine, EDDA) with the steel substrate upon curing and postcuring treatments, sum-frequency generation (SFG) vibrational spectroscopy with a sandwiched transparent window/epoxy adhesive/steel setup was applied to detect and track the buried molecular-level structures at the epoxy adhesive/steel interface. An X-ray photoelectron spectroscopic (XPS) experiment was performed to probe the intentionally exposed interface to disclose the occurring interfacial chemical reaction. The reaction between the epoxy groups and the steel-surface OH groups and the molecular reconstruction of interfacial epoxy methyl groups upon curing and postcuring steps were confirmed. The latter also indirectly indicated the formation of the additional hydrogen bonding and the former bonding reaction at the interface. The above two spectroscopic experimental results matched up with the further examination of the adhesion strength. Therefore, this work elucidates the formation of the interfacial bonding between the epoxy formula and the steel substrate upon curing and postcuring treatments at the molecular level, thus providing an in-depth insight into the origin of the interfacial adhesion.
研究领域:
材料科学
·
表面化学
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DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2013
·Vol. 29
·期 3
·460-466
·
IF 0.869
SHAO Zhi-Cheng,SONG Le-Xin,TENG Yue,DANG Zheng,XIA Juan
Increased water solubility of molybdenum trioxide (MoO3) induced by β-cyclodextrin (CD), with solubility dependent on β-CD concentration is reported. The dynamic equilibrium established between MoO3 precipitation
and dissolution shifted towards dissolution upon the addition of aqueous β-CD, to form a bluish-grey product. This was confirmed to be of β-CD and MoO4
2- by: (1) X-ray photoelectron spectroscopy showed decreased Mo 3d5/2
and 3d3/2 binding energies of the product compared with those of MoO3; (2) a strong band at 213 nm and new broad peak near 775 nm of the product were attributed to MoO and Mo―O bond absorption; (3) a downfield shift of β-CD
protons due to the effect of MoO4
2- ions. An interaction between β-CD and MoO4
2- has been revealed and hints at the possibility of exploiting it for improving MoO3 physical properties
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING COMMUNICATIONS
·
2025
·
IF 2
Van Thi Thanh Ho,Khuong Anh Nguyen Quoc,Quynh Le Nguyen Huong,Bao Gia Pham Dinh,Tam Thi My Luu,Duy Huynh Minh Nguyen,Thao Nguyen Phuong,Han Tran Ngoc,Tuan Huynh Nguyen Anh
Volatile organic compounds (VOCs) are hazardous chemicals that significantly threaten public health, making their remediation an increasingly pressing concern. Among the various solutions proposed, the use of TiO2 photocatalysts has garnered attention because of their practicality, cost-effectiveness, high catalytic activity, and human-friendly nature. This study discussed the potential of Wolfram (W)-doped TiO2 catalyst in enhancing VOC degradation under UV light irradiation and used xylene as the target VOC. The nanostructured W-doped TiO2 materials were fabricated without surfactants or post-reaction calcination at a low temperature for 10 h, yielding promising results. We carefully investigated these nanomaterials’ characterization using microscopic and spectroscopic techniques such as XRD, TEM, SEM, EDS, XRF, EIS, and XPS. The XPS analysis revealed W-O-Ti linkages and improved charge separation, while EIS showed enhanced conductivity and reduced charge transfer resistance, with 1.5 mol% W achieving optimal performance. These results evaluate the successful synthesis of W-doped TiO2, which can be applied to VOC treatment. Notably, the photocatalytic degradation of xylene gas reached 99.77% within 10 min of UV illumination. This result demonstrates the outstanding properties of this catalyst as a promising solution for VOCs pollution control.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2015
·Vol. 107
·期 6
·
IF 3.302
Liu Lijia,McLeod John A.,Wang Rongbin,Shen Pengfei,Duhm Steffen
The formation mechanism of perovskite methylammonium lead triiodide (CH 3 NH 3 PbI 3 ) was studied with in situ X-ray photoelectron spectroscopy (XPS) on successive depositions of thermally evaporated methylammonium iodide (CH 3 NH 3 I) on a lead iodide (PbI 2 ) film. This deposition method mimics the “two-step” synthesis method commonly used in device fabrication. We find that several competing processes occur during the formation of perovskite CH 3 NH 3 PbI 3 . Our most important finding is that during vapour deposition of CH 3 NH 3 I onto PbI 2 , at least two carbon species are present in the resulting material, while only one nitrogen species is present. This suggests that CH 3 NH 3 I can dissociate during the transition to a perovskite phase, and some of the resulting molecules can be incorporated into the perovskite. The effect of partial CH 3 NH 3 substitution with CH 3 was evaluated, and electronic structure calculations show that CH 3 defects would impact the photovoltaic performance in perovskite solar cells. The possibility that not all A sites in the A PbI 3 perovskite are occupied by CH 3 NH 3 is therefore an important consideration when evaluating the performance of organometallic trihalide solar cells synthesized using typical approaches.
研究领域:
材料科学
·
物理化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Pengcheng Li,Shujuan Dai,Xiaoan Li,Wenhan Sun,Shujie Liu
The leaching rates for gold in the roasting oxidation pretreatment-cyanidation gold leaching process are generally low. An adsorption experiment for quartz baking slag (roasting time of 3 h, roasting temperature of 650℃) and gold cyanide solution was carried out under different stirring time conditions. It is found that after high temperature activation of the quartz surface, gold cyanide can be adsorbed. When the stirring time reaches 50 min, the adsorption rate is 6.08%, and the unit adsorption amount is 0.05 mg·g −1 . The EDS spectrum clearly shows that the Au element is distributed among Si and O, and 0.02% Au is adsorbed on the surface of the quartz baking slag. To further prove the adsorption mechanism for the gold cyanide solution and quartz slag, infrared spectroscopy (IR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the surface of quartz slags. Infrared spectroscopy analysis shows that new peaks emerge at 1429 cm −1 , 1878 cm −1 , and 1996 cm −1 after the elution experiment, and the characteristic peaks for inorganic cyanide are observed at 1878 cm −1 and 1996 cm −1 . This shows that after high-temperature activation of the quartz baking slag, chemical adsorption of gold cyanide occurs. The results obtained from X-ray photoelectron spectroscopy (XPS) show that during the adsorption process, Au-Si is adsorbed together, and Au shows a valence of + 1, which indicates that Au(CN) 2− ions are adsorbed onto the quartz activated at high temperature. Density functional theory (DFT) was used to determine the adsorption mechanism for Au(CN) 2− ions and different sites on the surface of quartz (1 0 1) before and after high-temperature activation (three Au-O, Au-Si, and N-Si adsorption sites). During the high-temperature activation process, the Au-O bonds and interactions on the surface of gold cyanide and quartz gradually transform into Au-Si bonds and interactions, and the N-Si bonds are also enhanced. This shows that the adsorption of gold cyanide onto quartz baking slag is enhanced after high-temperature activation. The simulation calculation result is consistent with the experimental results.
研究领域:
矿物学
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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