Nanomaterials
·
2020
·Vol. 10
·期 11
·2206
·
IF 4.324
Gaoqian Yuan,Gen Zhang,Kezhuo Li,Faliang Li,Yunbo Cao,Jiangfeng He,Zhong Huang,Quanli Jia,Shaowei Zhang,Haijun Zhang
Loading a noble metal on Bi4Ti3O12could enable the formation of the Schottky barrier at the interface between the former and the latter, which causes electrons to be trapped and inhibits the recombination of photoelectrons and photoholes. In this paper, AgPt/Bi4Ti3O12composite photocatalysts were prepared using the photoreduction method, and the effects of the type and content of noble metal on the photocatalytic performance of the catalysts were investigated. The photocatalytic degradation of rhodamine B (RhB) showed that the loading of AgPt bimetallic nanoparticles significantly improved the catalytic performance of Bi4Ti3O12. When 0.10 wt% noble metal was loaded, the degradation rate for RhB of Ag0.7Pt0.3/Bi4Ti3O12was 0.027 min−1, which was respectively about 2, 1.7 and 3.7 times as that of Ag/Bi4Ti3O12, Pt/Bi3Ti4O12and Bi4Ti3O12.The reasons may be attributed as follows: (i) the utilization of visible light was enhanced due to the surface plasmon resonance effect of Ag and Pt in the visible region; (ii) Ag nanoparticles mainly acted as electron acceptors to restrain the recombination of photogenerated electron-hole pairs under visible light irradiation; and (iii) Pt nanoparticles acted as electron cocatalysts to further suppress the recombination of photogenerated electron-hole pairs. The photocatalytic performance of Ag0.7Pt0.3/Bi4Ti3O12was superior to that of Ag/Bi4Ti3O12and Pt/Bi3Ti4O12owing to the synergistic effect between Ag and Pt nanoparticles.Keywords:photocatalytic;Rhodamine B;photoreduction;Bi4Ti3O12;AgPt/Bi4Ti3O12
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
Nanomaterials
·
2021
·Vol. 11
·期 10
·2705
·
IF 5.076
He-Chun Zhou,Yan-Ping Jiang,Xin-Gui Tang,Qiu-Xiang Liu,Wen-Hua Li,Zhen-Hua Tang
Herein, Bi4Ti3O12(BIT) ferroelectric thin films were fabricated into Au/BIT/LaNiO3/Si structures to demonstrate their memristor properties. Repeatable and stable bipolar resistive switching (RS) characteristics of the device are first reported in this work. The switching ratio of the device annealed in air reached approximately 102at 0.1 and −0.1 V. The RS performance was not significantly degraded after 100 consecutive cycles of testing. We also explored the factors affecting the RS behavior of the device. By investigating the RS characteristics of the devices annealed in O2,and in combination with XPS analysis, we found that the RS properties were closely related to the presence of oxygen vacancies. The devices annealed in air exhibited a markedly improved RS effect over those annealed in O2. According to the slope fitting, the conduction mechanism of the device was the ohmic conduction and space charge limited current (SCLC). This study is the first to successfully apply BIT ferroelectric films to the RS layers of memristors. Additionally, a theory of conductive filaments is proposed to adequately explain the relationship between RS behavior and oxygen vacancies, providing meaningful inspiration for designing high-quality resistive random access memory devices.Keywords:Bi4Ti3O12;resistive switching;oxygen vacancies;conductive filaments;thin film
研究领域:
材料科学
·
电子学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Yue Liang,Linghui Shen,Tong Wei,Chuanzhen Zhao,Bing Jia,Yong Shi,Shengcheng Wu
Up-conversion nanoparticles (UCNPs) stimulated by near-infrared (NIR) light have received immense interest for their potential applications in many fields. In this work, Nd 3+ - and Yb 3+ -sensitized Bi 4 Ti 3 O 12 (BiT x :Nd 3+ /Yb 3+ , 0.005 ≤ x ≤ 0.3) UCNPs with thermometric and photo-thermal (PT) functions were successfully synthesized by a convenient co-precipitation approach, and the phase and morphologies were characterized. Under 980 nm excitation, BiT x :Nd 3+ /Yb 3+ UCNPs exhibited remarkable multiple emissions in the region from 450 to 900 nm. The visible and NIR emissions were tightly dependent on the Nd 3+ concentration and the strongest NIR emissions were obtained in sample BiT0.3:Nd 3+ /Yb 3+ . The possible UC mechanisms and processes were proposed. Furthermore, the capability of the UCNPs as thermometers was probed based on the thermo-responsive fluorescence intensity ratio technique in the temperature range 303–573 K. The maximum sensitivity (S max ) of BiT0.3:Nd 3+ /Yb 3+ was determined to be as high as 0.032 K -1 . Meanwhile, PT effect was evaluated by monitoring the variation of surface temperature of the sample as functions of irradiation time and power density. Conspicuous PT effect was confirmed and the maximum temperature induced by laser was about 91 °C. These results reveal that BiT0.3:Nd 3+ /Yb 3+ UCNPs has promising potential applications as optical thermometer and heater.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Ning Zhang,Rong Wu,Yu Zhang,Jianyong Yue,Haitong Jing,Shunhang Wei,Fangping Ouyang
The photocatalytic activity of Bi 4 Ti 3 O 12 is limited by the lack of active sites and rapid carrier recombination. In this work, the problems mentioned above are effectively solved by using a dual functional CuS load on the surface of Bi 4 Ti 3 O 12 . The CuS can be used as electron trapping sites to play a role as a cocatalyst, and form p-n junction with the Bi 4 Ti 3 O 12 under irradiation through the properties of p-type semiconductor. The dual functionality of CuS effectively promotes carrier separation and enhances the photocatalytic degradation activity. The photocatalytic rate of Bi 4 Ti 3 O 12 with optimal loading amount of CuS is ∼1.8 and ∼2.7 times as high as that of the Bi 4 Ti 3 O 12 and the CuS, respectively. The photocatalytic mechanism of the Bi 4 Ti 3 O 12 –CuS system is investigated in detail.
研究领域:
材料科学
·
环境科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Yujing Ou,Junqing Shi,Quanqing Yan,Chunlei Li,Yi Zheng
Molten salt synthesis is an efficient method for preparation of photocatalyst. Enhancing precursor mixing effect is important. In this study, we found ethanol is important for synthsis of face-to-face type Bi 4 Ti 3 O 12 /Bi 2 Ti 2 O 7 composite photocatalyst. The prepared Bi 4 Ti 3 O 12 /Bi 2 Ti 2 O 7 (B3) composite under molar ratio of Bi:Ti of 4:3.6 displays higher photocatalytic activity compared with Bi 4 Ti 3 O 12 (B1) and Bi 2 Ti 2 O 7 (B4). The photocurrent density of B3 is 2 times higher than B1 and 1.6 times higher than B4, and B3 has smallest charge resistance between sample and solution. Combined with XPS, the study found that the higher photocatalytic activity origins from large charge transfer interface and built-in electric field (BIEF) around such interface, rathor than light absorption and dark adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Mingchuang Shen,Yingzhang Shi,Zhiwen Wang,Taikang Wu,Ling Hu,Ling Wu
Ultrathin Bi 4 Ti 3 O 12 nanosheets (NS) with the thickness about 3.9 nm were successfully synthesized by a hydrothermal method and were used as a photocatalyst for the oxidation of benzyl alcohol (BA) to benzaldehyde (BAD). The photocatalytic performance of NS is about 8 times higher than that of bulk Bi 4 Ti 3 O 12 . In-situ FTIR of pyridine adsorption and NH 3 -TPD reveal that NS has more surface Lewis acid sites (Ti 4+ ) for the adsorption and activation of BA. The photogenerated electrons (e - ) and holes (h + ) of NS can be fully used to produce the superoxide radicals and carbon-centered radicals, respectively. The monolayer nanosheet structure of NS not only greatly promotes the separation of photogenerated carriers, but also achieves the efficient activation of BA molecules via the C O⋯Ti coordination. This work successfully reveals the surface/interface interactions between the surface active sites of a photocatalyst and the reactive molecules via using ultrathin nanosheet as a molecular platform.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 12
·6586-6591
·
IF 7.443
Hongfei Shi,Huaqiao Tan,Wan-bin Zhu,Zaicheng Sun,Yuejia Ma,Enbo Wang
A series of Cr-doped Bi4Ti3O12/Bi2Ti2O7 (BTO) heterostructure fibers have been synthesized via a one-step, facile and economical electrospinning/calcination process. SEM and TEM results reveal that the diameters of the as-prepared fibers are 100 ± 30 nm. The light adsorption of Bi4Ti3O12 and Bi2Ti2O7 in the fibers has been remarkably improved by Cr doping. With increased Cr doping, XRD and XPS show that the amount of Bi2Ti2O7 increases in the fibers. As a result, the Bi4Ti3O12/Bi2Ti2O7 heterojunction structure is enhanced, which further promotes the charge separation of photogenerated charge carriers. Photocatalytic tests indicated that the as-prepared Cr-doped Bi4Ti3O12/Bi2Ti2O7 fibers exhibit good photocatalytic activity for photodegradation of methyl orange (MO) under visible-light irradiation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Hongxia Liu,Minggang Zhang,Zhipeng Jin,Hui Mei,Gangqiang Zhu,Longkai Pan,Laifei Cheng,Litong Zhang
Photocatalysis is recognized as one of the most promising techniques for environment purification. However, the inconvenient recovery of powder photocatalysts significantly impeded their practical applications. Immobilization of the photocatalysts on supports to form monolithic photocatalysts is an effective method to solve this problem. Herein, a monolithic photocatalyst Bi 12 TiO 20 /Bi 4 Ti 3 O 12 /SiOC is fabricated by growing optimal Bi 12 TiO 20 /Bi 4 Ti 3 O 12 S-scheme heterojunction onto 3D-printed porous SiOC support. On one side, S-scheme heterojunction facilitates the separation of photoinduced electrons and holes while retaining their strong redox ability. On the other side, the porous structure favors mass transport and improves light harvesting by reflecting the light several times. Under simulated solar light irradiation, the NO removal efficiency of the monolithic photocatalyst Bi 12 TiO 20 /Bi 4 Ti 3 O 12 /SiOC is 16.4 %. Furthermore, the composite has good stability and reusability, suggesting its great potential in practical application. The possible photocatalytic mechanism is proposed according to systematic experiments and density functional theory (DFT). This work provides a rational reference for constructing efficient photocatalysts for environmental purification.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Yongbo Chen,Yi Zhou,Jin Zhang,Jiaxin Li,Tiantian Yao,Anna Chen,Zhiyue Chen
Construction of heterojunction is an effective way to improve the photocatalytic activity of photocatalyst . In this work, a simple precipitation method was adopted to anchor rod-like AgVO 3 on Bi 4 Ti 3 O 12 nanosheets to form heterojunction . The results show that Ag can act as an electronic medium to construct Z-scheme heterojunctions, that more visible light can be absorbed and facilitates the separation of electron hole pairs compared with the pure Bi 4 Ti 3 O 12 . The AgVO 3 /Bi 4 Ti 3 O 12 composites displayed superior photocatalytic photodegradation of tetracycline (TC) under visible irradiation (λ > 420 nm). 12%AgVO 3 /Bi 4 Ti 3 O 12 (AgVO 3 with the mass ratio of AgVO 3 /Bi 4 Ti 3 O 12 = 12%) showed the highest photocatalytic degradation efficiency, 57% of TC was degraded within 60 min which was the 9.5 times and 2.5 times higher than pure AgVO 3 and Bi 4 Ti 3 O 12 . The capture experiment results showed that ·O 2 − and h + are the main active radicals in the process of TC degradation. The improved photocatalytic activity is attributed to the construction of Z-scheme heterojunction , which leads to expand the light absorption range and efficient separation of photogenerated carriers. In addition, the mechanism of the photocatalytic degradation of antibiotics was proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Weiwei Mao,Bin Cai,Zhizhen Ye,Jingyun Huang
A glucose oxidase (GOx) based p-NiO/n-Bi 4 Ti 3 O 12 sandwich heterojunction was fabricated and explored as a glucose electrochemical sensor. The constructed GOx/p-NiO/n-Bi 4 Ti 3 O 12 sandwich structure effectively prevents the leakage of GOx. Dandelion-like Bi 4 Ti 3 O 12 nanowires were directly grown on the titanium foil substrates, and dense NiO nanoparticles were deposited by employing pulsed laser deposition at room temperature. Amperometric measurements towards glucose were carried out, and efficient direct electron transfer was successfully achieved. The enzyme biosensor showed a linear range from 20 μM to 3.55 mM (R = 0.999) with an ultrahigh sensitivity of 215 μA mM −1 cm −2 , response time within 2 s, low detection limit of 1.26 μM (S/N = 3) and high specificity. The apparent Michaelis-Menten constant (Km app) was estimated to be 0.22 mM. Intercrossed nanowires and interconnected pores favor the electrons transfer and the massive GOx loading. Binder-free feature leads to a seamless connection between Bi 4 Ti 3 O 12 nanowires and the substrate. Co-catalysis of GOx and p-NiO/n-Bi 4 Ti 3 O 12 heterojunction plays a synergetic role in gaining performance boosts. The GOx based p-NiO/n-Bi 4 Ti 3 O 12 heterojunction biosensor remedies the limitation of enzyme-based glucose sensor and be potentially applied in practice.
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hong Fan,Lili Ai,Mengjiao Xu,Shumin Wu,Luxiang Wang,Chuan Tan
Photocatalytic synthesis of hydrogen peroxide is an emerging topic for solar-to-chemical energy conversion. ZnIn 2 S 4 /Bi 4 Ti 3 O 12 (ZIS/BTO) - based S-scheme heterojunction semiconductor photocatalysts were prepared via a one-pot water bath method. Under visible light irradiation, the optimum H 2 O 2 yield of ZIS/BTO-2 reaches 1102 µmol L −1 , which is 20.0 and 11.5 times higher than those of the pure phases of Bi 4 Ti 3 O 12 and ZnIn 2 S 4 , respectively. Experimental and density functional theory (DFT) calculations demonstrated that the Built-in Electric Field (IEF) present between the ZIS/BTO S-type heterostructures not only facilitated the transfer of photogenerated carriers to surface active sites, but also promoted the adsorption of molecular oxygen and the tuning of the energy band structure. This resulted in an enhancement of the efficiency of photocatalytic oxygen reduction reaction (ORR) and the water oxidation reaction (WOR) for the synthesis of H 2 O 2 . Hence, the present study provided a practical route for the efficient synthesis of H 2 O 2 over Bi 4 Ti 3 O 12 - based photocatalysts and disclosed the reaction mechanism, that is, a heterojunction with a high efficiency for H 2 O 2 synthesis.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Nan Li,Yuhua Niu,Wengang An,Zonghang Liu,Fangyi Ruan,Guodong Fan
In this study, AgBr/Bi 4 Ti 3 O 12 /Bi 2 Sn 2 O 7 (ABr/BTO/BSO) composites were successfully synthesized to facilitate multi-channel fast charge transfer. This directs the charge carriers to travel along multichannel pathways and suppresses carrier recombination. The mechanisms underlying charge transfer in the dual S-scheme heterojunction composites were elucidated using density functional theory (DFT) and in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS). Furthermore, electron spin resonance (ESR) and burst experiments verified h + , ·O 2 - , and ·OH as the primary active species in the catalytic process. The ABr/BTO/BSO composites demonstrated exceptional photocatalytic redox capabilities, completely degrading rhodamine B (RhB) and achieving degradation rates of 77.21% for tetracycline (TC) and 81.04% for Cr (VI). Both experimental and theoretical analyses confirmed the intrinsic efficacy of photo-induced electron movement within the composites. This research introduces innovative design concepts and strategies for the advanced exploration of electron channel transfer in ABr/BTO/BSO ternary composites and the development of novel composite photocatalytic systems.
研究领域:
材料科学
·
环境科学
·
理论化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）