China Academy of Engineering Physics

About: China Academy of Engineering Physics is a facility organization based out in Mianyang, China. It is known for research contribution in the topics: Laser & Microstructure. The organization has 14158 authors who have published 12055 publications receiving 115810 citations. The organization is also known as: Ninth Institute of Second Ministry of Mechanical Industry & Ninth Institute of Ministry of Nuclear Industry.

Low-operating temperature ammonia sensor based on Cu2O nanoparticles decorated with p-type MoS2 nanosheets

Abstract: The high-operating temperature and poor selectivity of metal oxide semiconductor (MOS)-based chemiresistive-type gas sensors severely limit their application in the future Internet of Things (IoT), which need a lower power consumption and a higher accurate molecular recognition ability. Here, a simple and effective modification strategy is proposed for the incorporation of Cu2O and the two-dimensional (2D) material MoS2via a facile hydrothermal and wet chemical method. The sensing characteristics of a series of (p–p) Cu2O/MoS2 nanohybrids towards ammonia (NH3) are systematically investigated. The nanohybrid based sensor shows an excellent NH3 sensing performance compared with the pristine Cu2O nanoparticles in the 25–325 °C temperature range. Under an optimal low-operating temperature of 75 °C, the sensing performance for 20–100 ppm NH3 is studied and the sensing response of the Cu2O/MoS2 sensor (at ∼872%) with an optimized composition for 100 ppm NH3 is increased more than 8 times compared with the pristine Cu2O (∼103%) under the same conditions. Furthermore, excellent selectivity for NH3 is observed against other interferent gases. The Cu2O/MoS2 sensor belongs to a surface-controlled type and the enhanced sensing property of nanohybrid benefits from the superimposed effect of the p–p heterojunction formation and the elevated specific surface area at the interface between Cu2O and MoS2.

Few-layered ReS2 Nanosheets Vertically Aligned on Reduced Graphene Oxide for Superior Lithium and Sodium Storage

Abstract: We have exploited an efficient electrostatic attraction strategy to fabricate hybrid 2D–2D heterostructures consisting of few-layered ReS2 nanosheets chemically anchored on both sides of reduced graphene oxide in vertical orientation (v-ReS2/rGO) via a one-pot hydrothermal approach. The additive hydroxylamine hydrochloride plays a critical role in reversing the negatively charged pristine rGO to positively charged rGO, which favors the electrostatic attraction of ReO4− and facilitates the subsequent growth of the few-layered ReS2 nanosheets perpendicular to the rGO substrates, where ReS2 nanosheets present a thickness of ∼3.7 nm and a height of ∼50 nm relative to the rGO scaffold. Due to the synergistic effects of the elegant 2D–2D nano-hierarchy created on graphene, the resulting v-ReS2/rGO nanocomposite exhibits reversible lithium and sodium storage with excellent specific capacity and rate capability at low potentials, making such 2D–2D materials promising candidates as anode hosts in alkali ion batteries.

A Tunable Plasmonic Refractive Index Sensor with Nanoring-Strip Graphene Arrays.

Abstract: In the present study, we design a tunable plasmonic refractive index sensor with nanoring-strip graphene arrays. The calculations prove that the nanoring-strip have two transmission dips. By changing the strip length L of the present structure, we find that the nanoring-strip graphene arrays have a wide range of resonances (resonance wavelength increases from 17.73 μm to 28.15 μm). When changing the sensing medium refractive index nmed, the sensitivity of mode A and B can reach 2.97 μm/RIU and 5.20 μm/RIU. By changing the doping level ng, we notice that the transmission characteristics can be tuned flexibly. Finally, the proposed sensor also shows good angle tolerance for both transverse magnetic (TM) and transverse electric (TE) polarizations. The proposed nanoring-strip graphene arrays along with the numerical results could open a new avenue to realize various tunable plasmon devices and have a great application prospect in biosensing, detection, and imaging.

340-GHz 3-D Imaging Radar With 4Tx-16Rx MIMO Array

Abstract: A standoff 3-D imaging radar for security body scan at 340 GHz has been described. This terahertz imager incorporates a multiple input multiple output (MIMO) array as an electronic beam former in a horizontal dimension and an elliptic cylinder as a focusing reflector in elevation. Frequency-modulated continuous-wave (FMCW) emission with 16-GHz bandwidth caused a 10-mm-range resolution after calibration for nonlinearities of the distorted radar signals. The horizontal MIMO array contains 4 transmitters and 16 receivers (4Tx-16Rx) to generate a 64-Tx/Rx full virtual array corresponding to an antenna size of approximately 128 mm, which caused a horizontal resolution of about 14 mm at a distance of 3 m. FMCW signals were transmitted from the 4-Tx sequentially and focused as narrow beam lines by the elliptic reflector to get a 12-mm vertical resolution at 3 m. A fast-scanning mirror swings in the light path to make these beam lines screen in the vertical direction. A 4-Hz frame rate is now possible for a personal screen with a field of view of 2 m × 0.6 m.