APPLIED PHYSICS LETTERS
·
2016
·Vol. 109
·期 20
·
IF 3.142
Guo Chenglei,Tian Zhen,Xiao Yanjun,Mi Qixi,Xue Jiamin
We report the transport properties of mechanically exfoliated few-layer SnSe 2 flakes, whose mobility is found to be ∼85 cm 2 V −1 s −1 at 300 K, higher than those of the majority of few-layer transitional metal dichalcogenides. The mobility increases strongly with decreased temperature, indicating a phonon limited transport. The conductivity of the semiconducting SnSe 2 shows a metallic behavior, which is explained by two competing factors involving the different temperature dependence of mobility and carrier density. The Fermi level is found to be 87 meV below the conduction band minima (CBM) at 300 K and 12 meV below the CBM at 78 K, resulting from a heavy n-type doping. Previous studies have found SnSe 2 field-effect transistors to be very difficult to turn off. We find the limiting factor to be the flake thickness compared with the maximum depletion width. With fully depleted devices, we are able to achieve a current on-off ratio of ∼10 5 . These results demonstrate the great potential of SnSe 2 as a two dimensional (2D) semiconducting material and are helpful for our understanding of other heavily doped 2D materials.
研究领域:
材料科学
·
半导体物理
·
纳米技术
✓ 已验证
DOI
高影响因子
Advanced Science
·
2022
·Vol. 9
·期 29
·2203436
·
IF 17.521
Tingting Deng,Zhiqiang Gao,Pengfei Qiu,Tian-Ran Wei,Jie Xiao,Genshui Wang,Lidong Chen,Xun Shi
The recently discovered ductile/plastic inorganic semiconductors pave a new avenue toward flexible thermoelectrics. However, the power factors of current ductile/plastic inorganic semiconductors are usually low (below 5 µW cm −1 K −2 ) as compared with classic brittle inorganic thermoelectric materials, which greatly limit the electrical output power for flexible thermoelectrics. Here, large plasticity and high power factor in bulk two-dimensional van der Waals (2D vdW) single-crystalline SnSe 2 are reported. SnSe 2 crystals exhibit large plastic strains at room temperature and they can be morphed into various shapes without cracking, which is well captured by the inherent large deformability factor. As a semiconductor, the electrical transport properties of SnSe 2 can be readily tuned in a wide range by doping a tiny amount of halogen elements. A high power factor of 10.8 µW cm −1 K −2 at 375 K along the in-plane direction is achieved in plastic single-crystalline Br-doped SnSe 2 , which is the highest value among the reported flexible inorganic and organic thermoelectric materials. Combining the good plasticity, excellent power factors, as well as low-cost and nontoxic elements, bulk 2D vdW single-crystalline SnSe 2 shows great promise to achieve high power density for flexible thermoelectrics.
研究领域:
材料科学
·
热电学
·
柔性电子学
·
无机半导体
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
He Tian,Xiancheng Meng,Juehan Yang,Chao Fan,Shuo Yuan,Xia An,Chun Sun,Yonghui Zhang,Mengjun Wang,Hongxing Zheng,Zhongming Wei,Erping Li
Two-dimensional (2D) nanomaterials have been attracting intensive interest due to their unique physical and optoelectronic properties. Van der Waals nanolayered heterostructures based on different 2D nanomaterials provide a state-of-the-art platform for investigating the physical phenomena and have extended the applications of 2D nanomaterials, leading to an era of next-generation high-performance electronic and optoelectronic technology. Herein, vertical 2D SnS/SnS2 p–n and SnSe2/SnS2 n–n nanolayered heterostructures are constructed by exfoliating individual materials and stacking them artificially. The two types of back-gate field-effect phototransistors show clear rectifying behaviors with the existence of band offset and excellent optoelectronic performances. The SnS/SnS2 p–n nanolayered heterostructure shows an ambipolar behavior with a hole mobility of 6.96 cm2·V–1·s–1 and electron mobility of 0.68 cm2·V–1·s–1, while the SnSe2/SnS2 n–n nanolayered heterostructure shows an intense n-type behavior with electron mobility of 3.78 cm2·V–1·s–1 and a high on/off ratio of over 105. Interestingly, due to the band alignments and built-in potentials in the two types of nanolayered heterostructures, the phototransistors exhibit enhanced responsive performances to illuminations of three-primary-color lasers (λ = 405, 532, and 650 nm) compared to the individual components. The SnS/SnS2 phototransistor shows a high photoresponsivity of 3567 A W–1, a high detectivity of 3.64 × 1013 Jones, and a fast response time of 0.8 ms. The SnSe2/SnS2 phototransistor also exhibits a high photoresponsivity of 1793 A W–1 and a fast response time of 15.4 ms.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 已验证
产品关联
DOI
Journal of Energy Storage
·
2021
·
IF 6.583
Shang Wu,Sheng Zhou,Qiaoliang Feng,Huanlei Zhao,Xin Xu,Tao Cui,Hong Zhang,Xia Wang,Quanlu Yang
Tin metal was widely used in energy storage and photovoltaic devices due to its high stability and high conductivity. However, due to its low electrochemical performance, the application of tin compounds in supercapacitors was rarely reported. In this paper, it was first used a simple two-step hydrothermal method to design a nanospherical NiSe 2 /SnSe 2 composite as supercapacitor electrode materials. The composite exhibited excellent electrochemical properties, it not only increased conductivity and provided more active sites, but also shortened electron and ion transport paths. The (Ni, Sn)Se 2 -2.5 exhibited an appealing specific capacity (116 mA h g −1 at 1 A g −1 ) and better cycle stability (80% capacity retention after 4000 cycles). Moreover, asymmetric supercapacitors which were assembled with (Ni, Sn)Se 2 -2.5 and activated carbon had superior electrochemical performance. When the specific power was 855 W kg −1 , the specific energy can reached 34.2 Wh Kg −1 and accompanied by an efficient stability (82.3% of capacity retention after 10000 cycles). Therefore, the synthesized spherical (Ni, Sn)Se 2 -2.5 possessed excellent prospects as electrode materials for supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Qing Han,Xiaoxiao Sui,Gongao Jiao,Zuozhe Ding,Hao Zhang,Dongzhi Zhang
In this work, a low-temperature formaldehyde sensor based on a hydrothermally synthesized tin dioxide/tin selenide (SnO2/SnSe2) nanostructure was demonstrated. The SnO2 nanosheets were decorated on the SnSe2 nanoblocks. The microstructural characterization proves this unique morphology. At 150 °C, the SnO2/SnSe2 composite gas sensor exhibits more than three times the response to formaldehyde gas compared to pure SnO2, with a response of 13.47 to 10 ppm formaldehyde and a response recovery time of 63 s/12 s. In addition, the SnO2/SnSe2 gas sensor is capable of detecting formaldehyde gas at the ppb level. The sensor also exhibits excellent repeatability, excellent long-term performance stability, and resistance to humidity interference. The n–n heterojunction formed between SnO2 and SnSe2, along with its unique microstructure, significantly enhances the performance of the SnO2/SnSe2 sensor. The adsorption behavior of formaldehyde molecules on sensitive material surfaces was studied by using density functional theory.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 33
·10179-10186
·
IF 6.641
Weiwei Li,Lei Xiong,Nianci Li,Shuo Pang,Guoliang Xu,Chenghan Yi,Zhixun Wang,Guoqiang Gu,Kaiwei Li,Weimin Li,Lei Wei,Guangyuan Li,Chunlei Yang,Ming Chen
Adopting semiconductor materials with light-trapping architectures as the surface-enhanced Raman spectroscopy (SERS)-active substrates has received increasing attention, in which the multiple reflection and scattering of electromagnetic waves can improve the enhancement factor. However, the fabrication of these semiconductor SERS-active substrates commonly requires complicated processes, and these methods normally result in non-uniform and isolated particles/flakes, which have fundamental difficulties in meeting the practical needs in high performance and reliable SERS substrates. Herein, we demonstrate that SnSe2 nanoplate arrays (NPAs) via self-assembled growth can serve as uniform, highly sensitive and reliable SERS substrates. The cavity formed by the SnSe2 NPAs can trap light efficiently (∼96%) and thus improve the enhancement factor. Benefiting from the synergistic effect of the charge-transfer process and enhanced light trapping, the resulting SERS substrates based on pure SnSe2 NPAs show an ultralow detection limit (1 × 10−12 M), a high enhancement factor (6.33 × 106) and excellent uniformity (relative standard deviations down to 7.7%), demonstrating one of the highest sensitivities amongst the reported semiconductor SERS substrates. Furthermore, the effects of different SnSe2 structural configurations (planar vs. cavity), the height and tilt angle of the SnSe2 NPAs on the performance of SERS detection are systematically investigated. It is discovered that the SERS performance is strongly dependent on both the light-trapping ability and the absorption loss. We believe that our results not only provide an effective strategy to obtain tunable, uniform and high performance SERS substrates, but also lead to further understanding of designing 3D light trapping architectures.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2020
·Vol. 51
·期 5
·750-755
·
IF 2
Mei Liu,Ying Shi,Meimei Wu,Yuan Tian,Haonan Wei,Qianqian Sun,Muhammad Shafi,Baoyuan Man
Two-dimensional (2D)-layered semiconductor materials have attracted considerable attention in surface-enhanced Raman scattering spectroscopy (SERS) technology owing to their high uniformity, excellent reproducibility, and ultra-flat surfaces without dangling bonds. However, they are rarely used in the UV laser-excited surface-enhanced Raman scattering spectroscopy (UV–SERS) field. In this article, 2D-layered tin diselenide (SnSe 2 ) nanoflakes were investigated as a UV–SERS substrate for the first time. The strong absorption in the UV region of SnSe 2 induces a pre-resonance Raman (pre-RR) effect and charge transfer (CT) between the substrate and the probe molecules. The UV–SERS signal of crystal violet (CV) molecules adsorbed on SnSe 2 nanoflakes was obtained even though the concentration was low at 10 −7 mol/L. The indirect band gap structure of the SnSe 2 nanoflake plays a significant role in promoting the electrons excited by incident photons and the CT process. This is a new phenomenon for 2D semiconductor materials in the UV–SERS field. The results will be helpful to develop UV–SERS technology based on 2D-layered materials and to provide a promising method to understand the chemical enhancement mechanism of UV–SERS.
研究领域:
材料科学
·
纳米技术
·
光谱学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JACS Au
·
2025
·
IF 8.7
Hui-Peng Lv,Yong Ai,Wei Hu,Yuqin Susan Xiong,Yan-Ran Weng,Xian-Jiang Song,Yan Qin,Wei-Qiang Liao,Ren-Gen Xiong
Molecule intercalation has shown distinct advantages in modulating the superconducting properties of 2D materials. Chiral molecule intercalation provides a strategy for tuning electronic properties, while this approach has been limited to a few 2D materials such as TaS2 and TiS2. Although extensive research on 2D SnSe2 exists, chiral molecule intercalation in SnSe2 remains unexplored. Herein, we report the first successful electrochemical intercalation of chiral CTA cations (CTA = 3-chloro-2-hydroxypropyltrimethylammonium) into SnSe2 by using piezoelectric R/S-CTA-Cl with a large piezoelectric coefficient of approximately 24 pm/V as the precursors, leading to the formation of superconductors R/S-CTA–SnSe2. Characterization techniques, including powder X-ray diffraction, Raman spectroscopy, and circular dichroism spectroscopy, confirm a significant lattice expansion in SnSe2 and the successful intercalation of chiral CTA cations, while polar R/S-CTA-Cl does not endow R/S-CTA–SnSe2 with piezoelectric/ferroelectric properties. Magnetic susceptibility and electrical transport measurements reveal that the intercalated R/S-CTA–SnSe2 materials exhibit a superconducting transition at around 5 K. Notably, the distinct out-of-plane and in-plane upper critical magnetic fields demonstrate the 2D nature of the intercalated compounds. This work highlights an approach for designing and tailoring superconducting materials through chiral cation intercalation and opens avenues for further exploration of chiral effects in superconductors.
研究领域:
材料科学
·
凝聚态物理
·
纳米技术
·
电化学
·
固体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Ao Shen,Zhichen Shi,Wenyuan Zhang,Yi Zhai,Yongbao Feng,Wenbin Gong,Peng Xu,Qiulong Li
Tin-based compounds have an ultrahigh theoretical capacity and low oxidation-reduction potential, making them as a very important type of anode matrix for lithium-ion batteries (LIBs). Nevertheless, the enormous volume dilatation causes structural collapse, limiting its cyclic stability. Herein, a nanoscale SnO 2 /SnSe 2 @rGO has been designed, in which the interface of SnO 2 /SnSe 2 heterostructure generates a built-in electric field, improving charge transfer efficiency. And rGO, as a 3D interconnection network coating SnO 2 /SnSe 2 nanoparticles, improves conductivity and serves as a buffer medium for volume expansion. DFT calculations confirm that the formation of built-in electric field enhances the adsorption energy of Li + and reduces the migration energy barrier. As expected, the initial capacity of the SnO 2 /SnSe 2 @rGO electrode can reach 1405.9 mAh g −1 at 2.0 A g −1 . The reversible capacity is 1459.1 mAh g −1 at 0.1 A g −1 after 50 cycles, with 78.1 % capacity retention. Finally, a SnO 2 /SnSe 2 @rGO//LiFePO 4 (LFP) full battery was assembled, which exhibits a high capacity of 213.1 mAh g −1 at 0.1 A g −1 and energy density of 492.8 Wh kg −1 at 270 W kg −1 . The design of this nanoscale heterostructure provides a feasible strategy for developing LIBs anodes with enhanced capacity and extended lifespan.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Shaohai Wu,Hengquan Yang,Zhengsen Wu,Chengyan Liu,Lei Miao,Jie Gao,Xiaoyang Wang,Xiuxia Wang,Chengjin Shen,Jacques G. Noudem,Jun Wang
Eco-friendly and low-cost layered SnSe2-based materials have been attracting great attention in the thermoelectric field for their intrinsically low thermal conductivity. In this work, we applied AgCl as Cl-dopant and formed Ag-rich precipitates in SnSe2 polycrystals, and their thermoelectric properties were investigated. The results demonstrate that Cl was artificially incorporated into SnSe2 by the substitution of Se atoms, playing as donor centers and thus increasing the carrier concentration by 2 orders of magnitude, leading to a tremendous improvement of the electrical conductivity and power factor. However, Ag atoms hardly enter into the Sn lattice sites and brought about the generation of Ag-rich precipitates. The complicated microstructures with multiple types of defects, such as point defects, boundaries, dislocations, and so on, result in a relatively low lattice thermal conductivity in the AgCl-introduced SnSe2 samples. Additionally, the anisotropic electrical and thermal transport properties were investigated, and the results show that higher ZT values were obtained along the pressing direction in these textured samples because of the significantly suppressed lattice thermal conductivity caused by the enhanced phonon scattering via the interior van der Waals layers. Ultimately, a maximum ZT value of 0.35 was realized at 400 °C in the polycrystalline SnSe2 with introduction of 11 mol % AgCl, which is nearly 3 times higher than that value of the pristine counterpart. It demonstrates that the combined effects of Cl-doping, Ag-rich precipitates, and texturing could effectively enhance the ZT value for polycrystalline SnSe2.
研究领域:
材料科学
·
热电学
·
固体物理学
✓ 已验证
产品关联
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ruibin Wang,Shilong Zhang,Jiahai Wang,Qinqin Yang,Chenhong Liu,Linghua Jin,Huiyang Bian,Ye Zhang
Innovative and efficient photodetectors (PDs) using carbon dots (CDs) have drawn tremendous interest from electrochemical analyses in recent years. This study develops a chips Ahoy cookies-like architecture comprising CDs-decorated SnSe 2 (CSS) through a simple hydrothermal method. The CSS-based PDs demonstrate excellent photo-responsive behaviors with optimal photocurrent density ( P ph , 60.13 μA cm −2 ), photoresponsivity ( R ph , 56.03 μA W −1 ), and detectivity (2.84 × 10 10 Jones). The benefits of CDs for the enhanced photodetection of CSS were ascribed to the synergy between CDs and SnSe 2 providing an engineered interface and abundant active surface sites. It was also found that the unique morphology of CSS was compatible with the performance enhancement of CDs under optimal conditions. In this way, the CSS-based flexible PDs can enrich the fundamental study of CDs and pave the way for the exploration of diselenide-based composites for electrochemical photodetection.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
电化学
·
半导体器件
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xuezheng Guo,Yijie Shi,Peilin Liu,Yanqiao Ding,Bingsheng Du,Chengyao Liang,Wen Niu,Yiling Tan,Yuhui He,Jiangzhao Chen,Xiangshui Miao,Xi Yang,Yong He
Explosives can be analyzed for their content by detecting the photolytic gaseous byproducts. However, to prevent electrostatic sparking, explosives are frequently preserved in conditions with low temperatures and high humidity, impeding the performance of gas detection. Thus, it has become a research priority to develop gas sensors that operate at ambient temperature and high humidity levels in the realm of explosive breakdown gas-phase detection. In this work, 3-aminopropyltriethoxysilane (APTES) self-assembled monolayer-functionalized tin diselenide (APTES-SnSe2) nanosheets were synthesized via a facile solution stirring strategy, resulting in a room-temperature NO2 sensor with improved sensitivity and humidity tolerance. The APTES-SnSe2 sensor with moderate functionalization time outperforms the pure SnSe2 sensor in terms of the response value (317.51 vs 110.98%) and response deviation (3.11 vs 24.13%) under humidity interference to 500 ppb NO2. According to density functional theory simulations, the stronger adsorption of terminal amino groups of the APTES molecules to NO2 molecules and stable adsorption energy in the presence of H2O are the causes of the improved sensing capabilities. Practically, the APTES-SnSe2 sensor achieves accurate detection of photolysis gases from trace nitro explosives octogen, pentaerythritol tetranitrate, and trinitrotoluene at room temperature and various humidity levels. This study provides a potential strategy for the construction of gas sensors with high responsiveness and antihumidity capabilities to identify explosive content in harsh environments.
研究领域:
材料科学
·
化学传感器
·
爆炸物检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）