Daihua Zhang

Daihua Zhang
Tianjin University | tju · State Key Laboratory of Precision Measurement Technology and Instruments

About

141
Publications
21,137
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
7,068
Citations
Citations since 2016
62 Research Items
3326 Citations
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500

Publications

Publications (141)
Article
Programmable capability is highly demanded by adaptive multifunctional electronic and optoelectronic devices in various application fields, including logic circuits and data storage and sensing. The ideal platform to develop programmable devices is the van der Waals heterostructures (vdWHs) integrated by atomically thin layered two-dimensional tran...
Article
van der Waals layered heterojunctions have a variety of band offsets that open up possibilities for a wide range of novel and multifunctional devices. However, due to their poor pristine carrier concentrations and limited band modulation methods, multifunctional p-n heterojunctions are very difficult to achieve. In this report, we developed a highl...
Article
Flash memories and semiconductor p-n junctions are two elementary but incompatible building blocks of most electronic and optoelectronic devices. The pressing demand to efficiently transfer massive data between memories and logic circuits, as well as for high data storage capability and device integration density, has fueled the rapid growth of tec...
Article
Charge-trapping memories based on two-dimensional (2D) material heterostructures possess atomically thin structure and excellent charge transport capability, making them promising candidates for next-generation flash memories to achieve miniaturized size, high storage capacity, fast switch speed, and low power consumption. Here, we report a nonvola...
Article
Heterostructures formed by stacking atomically thin two-dimensional materials are promising candidates for flash memory devices to achieve premium performances, due to the capability of effective carrier modulation and unique charge trapping behavior at the interfaces with atomic flatness. Here, we report a nonvolatile floating-gate flash memory ba...
Article
Controllable and wide-range modulation of the carrier type and mobility in atomically thin two-dimensional (2D) materials is one of most critical issues to be addressed before 2D materials can be practically used for future electronic and optoelectronic devices. In this work, we propose using a novel surface charge transfer mechanism to accomplish...
Article
Full-text available
Energy band engineering is of fundamental importance in nanoelectronics. Compared to chemical approaches such as doping and surface functionalization, electrical and optical methods provide greater flexibility that enables continuous, reversible, and in situ band tuning on electronic devices of various kinds. In this report, we demonstrate highly e...
Article
Van der Waals (vdW) p-n heterojunctions formed by two dimensional nanomaterials exhibit many physical properties and deliver functionalities to enable future electronic and optoelectronic devices. In this report, we demonstrate a tunable and high-performance anti-ambipolar transistor based on MoTe2/MoS2 heterojunction through in situ photo-induced...
Article
Devices based on quantum transportation mechanism usually achieve higher frequency and more efficient carrier manipulation than traditional devices, which may enable numerous novel functional devices/circuits. The discovery of atomically thin two-dimensional materials provides an additional platform for developing nanoscale quantum devices. In this...
Article
Full-text available
Mechanical strain induced changes in the electronic properties of two-dimensional (2D) materials is of great interest for both fundamental studies and practical applications. The anisotropic 2D materials may further exhibit different electronic changes when the strain is applied along different crystalline axes. The resulted anisotropic piezoresist...
Article
Layered black phosphorus (BP) has been expected to be a promising material for future electronic and optoelectronic applications since its discovery. However, the difficulty in mass fabricating layered air-stable BP severely obstructs its potential industry applications. Here, we report a new BP chemical modification method to implement all-solutio...
Article
The air instability of black phosphorus (BP) severely hinders the development of its electronic and optoelectronic applications. Although a lot of effort has been made to passivate it against degradation in ambient conditions, approaches to further manipulate the properties of passivated BP are still very limited. Herein, we report a simple and low...
Article
The unique properties of two-dimensional (2D) materials make them promising candidates for chemical and biological sensing applications. However, most 2D material sensors suffer from extremely long recovery time due to the slow molecular desorption at room temperature. Here, we report an ultra-sensitive p-type Molybdenum ditelluride (MoTe2) gas sen...
Article
Atomically thin two-dimensional (2D) materials are ideal gas sensing materials to achieve ultra-low detection limit, due to the high surface-to-volume ratio, low electronic noise and sensitively tunable Fermi level. However, the sensitivity of 2D materials to surrounding environment may also severely degrades the long-term stability of the sensing...
Article
Efficient modulation of carrier concentration is of fundamental importance for tailoring the electronic and photoelectronic properties of semiconducting materials. Photo-induced doping is potentially a promising way to realize such a goal for atomically thin nanomaterials in a rapid and defect-free manner. However, the wide applications of photo-in...
Article
High performance p-n junctions based on atomically thin two-dimensional (2D) materials are the fundamental building blocks for many nano-scale functional devices that are ideally for future electronic and optoelectronic applications. The lateral p-n homo-junctions outperform vertically stacked ones in terms of conveniently tunable band offset, howe...
Article
A large-area uniform of single-crystal disulfide (WS2) is important for advanced optoelectronics based on two-dimensional (2D) atomic crystals. However, difficulies in controlling the interrelated growth parameters restrict its development in devices. Herein, we present the synthesis of triangular monolayered WS2 flakes with good uniformity and sin...
Article
Transition metal dichalcogenides (TMDCs) have recently become spotlighted as nanomaterials for future electronic and optoelectronic devices. In this work, we develop an effective approach to enhancing the electronic and optoelectronic performance of WSe2-based devices by N2O plasma treatment. The hole mobility and sheet density increase by 2 and 5...
Article
We developed a new way to enhance the photoresponsivity of a van der Waals heterojunction p-n diode using surface acoustic waves (SAWs). The diode was constructed on top of a piezoelectric LiNbO3 substrate and composed of p-type black phosphorus (BP) and n-type molybdenum disulfide (MoS2) flakes that partly overlapped with each other. This layout f...
Article
Minimizing the strain induced undesirable effects is one of the major efforts to be made for flexible electronics. This work reports a highly sensitive flexible gas sensor with ultra-low strain response, which is potentially suitable for wearable electronics applications. The gas sensing material is a free-standing and flexible thin film made of gr...
Article
This paper introduces an on-chip acoustic graphene transistor based on lithium niobate thin film. The graphene transistor is embedded in a microelectromechanical systems (MEMS) acoustic wave device, and surface acoustic waves generated by the resonator induce a macroscopic current in the graphene due to the acousto-electric (AE) effect. The acousti...
Article
Optical anisotropy is one of the most fundamentally physical characteristics of the emerging low-symmetry two-dimensional (2D) materials. It bears abundant underneath information and is crucial for creating diverse nanoscale devices. Here, we proposed an azimuth-resolved microscopic approach to directly resolve the normalized optical difference alo...
Article
We report on a volatile organic compound (VOC) sensor that can provide concentration-independent signals toward target gases. The device is based on a dual-mode detection mechanism that can simultaneously record the mechanical (resonant frequency, fr) and electrical (current, I) responses from the same gas adsorption event. The two independent sign...
Article
Two-dimensional transition metal dichalcogenides (2D TMDCs) have been widely applied to electronic and optoelectronic device owing to their remarkable material properties. Many studies present the platform for regulating the contact resistance via various doping schemes. Here, we report the alteration of mechanical properties of few top layers of t...
Article
Full-text available
Few-layer black phosphorus (FLBP), a recently discovered two-dimensional semiconductor, has attracted substantial attention in the scientific and technical communities due to its great potential in electronic and optoelectronic applications. However, reactivity of FLBP flakes with ambient species limits its direct applications. Among various method...
Article
Physical unclonable functions have emerged as promising hardware security primitives for device authentication and key generation in the era of Internet of Things. Here we report novel physical unclonable functions built upon crossbars of nanoscale diffusive memristors that translate the stochastic distribution of Ag clusters in a SiO2 matrix into...
Article
In this work, we presented a thin-film piezoelectric acoustic gas sensor with enhanced sensitivity by a surface modification strategy of oxygen plasma treated graphene oxide (GO) functionalization. By exposing to ammonia vapor (NH3) of various concentrations at controlled temperature and humidity, the characteristics of the GO-coated acoustic senso...
Article
Mass fabrication of two dimensional materials with desirable thickness in a high efficient and low-cost approach is ideal for industry applications. In this article, a two-step thermal annealing method is reported to prepare thickness controlled black phosphorus (BP) flakes under moderate temperature within an ultra-short time, and thus, with ultra...
Conference Paper
Full-text available
In this paper, we fabricated a hybrid on-chip acoustic and field-effect device to investigate the acoustic carrier transportation in graphene. The device fabrication exploited aluminum nitride (AlN)-based surface micromachining process on a silicon wafer, facilitating an integration of a surface acoustic wave (SAW) delay line and a graphene field-e...
Conference Paper
Full-text available
An electrothermal bimorph based MEMS mirror with large scan range, high fill factor and high resonant frequency is presented. A reliability issue due to burn-out of a bimorph thermal actuator is also studied and modeled.
Article
We fabricated a hybrid on-chip acousto-electric (AE) and field-effect device to investigate the modulation of acoustic carrier transportation by gate voltage. The device fabrication exploited a surface micromachining aluminum nitride process on a silicon wafer, facilitating an integration of a surface acoustic wave(SAW) delay line and a graphene fi...
Article
Tuning the bandgap of thin-layered two-dimensional transition metal dichalcogenide (2D TMDCs) nanocrystals by controlling their composition or structure is considered to be an important method of tailoring light absorption, electron transition and carrier mobility. However, the large-scale synthesis of TMDs with a tunable bandgap on graphene remain...
Article
In article number 1602962, Xuexin Duan and co-workers, explore a novel chemical-free cell poration method – “hypersonic poration”, which is developed to improve the cellular uptake, especially nucleus uptake, using a designed piezoelectric nanoelectromechanical resonator. The hypersound has a typical frequency larger than GHz, which can directly in...
Article
The unique properties of two dimensional (2D) materials make them promising candidates for chemical and biological sensing applications. However, most 2D nanomaterial sensors suffer very long recovery time due to slow molecular desorption at room temperature. Here, we report a highly sensitive molybdenum ditelluride (MoTe2) gas sensor for NO2 and N...
Article
Efficient delivery of genes and therapeutic agents to the interior of the cell is critical for modern biotechnology. Herein, a new type of chemical-free cell poration method— hypersonic poration—is developed to improve the cellular uptake, especially the nucleus uptake. The hypersound (≈GHz) is generated by a designed piezoelectric nano-electromech...
Article
A novel one-step strategy to exfoliate and functionalize two dimensional layered materials (2DLM) is described to promote the production and performance of the 2DLM for bio-related and molecule adsorption based practical applications. This method applies sonication to the 2DLM dissolved in the aqueous solution of hydrophobin protein, during which p...
Article
Full-text available
This paper reports on the design, fabrication and preliminary test results of a novel microelectromechanical systems (MEMS) device—the acoustic gyroscope. The unique operating mechanism is based on the “acoustic version” of the Sagnac effect in fiber-optic gyros. The device measures the phase difference between two sound waves traveling in opposite...
Article
Full-text available
We present an acoustic microfluidic mixing approach via acousto-mechanically induced micro-vortices sustained by localized ultrahigh frequency (UHF) acoustic fields. A micro-fabricated solid-mounted thin-film piezoelectric resonator (SMR) with a frequency of 1.54 GHz has been integrated into microfluidic systems. Experimental and simulation results...
Conference Paper
ZnO nanorod/wire is a nanomaterial that possessing high surface area to volume ratio and excellent optical and electrical properties, indicating its promising sensing capabilities in various applications. Here, we present the research work of ZnO nanorod/wire based sensors carried out in our lab, which were used in the optical, electrical and mecha...
Article
A graphene/LiNbO3 hybrid device is used to investigate the acoustic induced charge transport in chemical doped graphene. The chemical doping of graphene via its physisorption of gas molecules affects the surface acoustic wave (SAW) charge carrier transport in a manner different from electric field drift. That transport induces doping dependent macr...
Article
We report on a new chemical sensor based on black phosphorus/molybdenum diselenide van der Waals hetero-junctions. Due to the atomically thin nature of two-dimensional (2D) materials, surface adsorption of gas molecules can effectively modulate the band alignment at the junction interface, making the device a highly sensitive detector for chemical...
Article
High-performance bulk acoustic wave (BAW) filters have been widely applied in the advanced radio frequency (RF) wireless communication systems in the past decade. However, the demand for filters with large bandwidth, up to 10%, still puts a significant stress on the typical aluminum nitride (AlN)-based BAW filters. In this work, a modified lattice...
Article
Full-text available
We demonstrate a dual-mode gas sensor for simultaneous and independent acquisition of electrical and mechanical signals from the same gas adsorption event. The device integrates a graphene field-effect transistor (FET) with a piezoelectric resonator in a seamless manner by leveraging multiple structural and functional synergies. Dual signals result...
Article
Transition metal dichalcogenides hold great promise for a variety of novel electrical, optical and mechanical devices and applications. Among them, molybdenum disulphide (MoS2) is gaining increasing attention as gate dielectrics and semiconductive channels for high-performance field effect transistors. Here we report on the first MoS2 phototransist...
Article
The large-scale synthesis of atomically thin, layered MoS2/graphene heterostructures is of great interest in optoelectronic devices because of their unique properties. Herein, we present a scalable synthesis method to prepare centimeter-scale, continuous, and uniform films of bilayer MoS2 using low-pressure chemical vapor deposition. This growth pr...
Article
Nanomaterial based chemical sensors promise exceedingly high sensitivity with ultra-small form factors. However, fundamental limitations in selectivity and recovery speed have largely hindered their application in real-life scenarios. We report on a unique approach to improving the key performance of ZnO nanowire sensors by leveraging their resisti...
Article
Full-text available
Resistive switching nanostructures are a promising candidate for next-generation non-volatile memories. In this report, we investigate the switching behaviors of single-crystalline ZnO nanowires suspended in air. They exhibit significantly higher current density, lower switching voltage, and more pronounced multiple conductance states compared to n...
Article
Full-text available
Nanopore sensors are expected to be one of the most promising next generation sequencing technologies, with label-free, amplification-free and high-throughput fea‐ tures, as well as rapid detections and low cost. Solid-state nanopores have been widely explored due to their diverse fabrication methods and CMOS compatibility. Here, we highlight the f...
Article
Full-text available
In this paper, we have modeled and analyzed affinities and kinetics of volatile organic compounds (VOCs) adsorption (and desorption) on various surface chemical groups using multiple self-assembled monolayers (SAMs) functionalized film bulk acoustic resonator (FBAR) array. The high-frequency and micro-scale resonator provides improved sensitivity i...
Article
Full-text available
We developed a micro-gas detector based on a Fabry-Perot (FP) cavity embedded in a microfluidic channel. The detector was fabricated in two steps: a silicon substrate was bonded to a glass slide curved with a micro-groove, forming a microfluidic FP cavity; then an optical fiber was inserted through a hole drilled at the center of the groove into th...
Article
We report on the excitation of acousto-eletric (AE) charge transport in monolayer graphene by acoustic transducers based on aluminum nitride thin films. The acoustic waves induced macroscopic current flow that linearly scaled with input power. The AE current exhibited unique frequency dependence due to special configuration and piezoelectric proper...
Article
Full-text available
In this letter, we demonstrate a technique to eliminate the spurious modes in aluminum nitride Lamb wave resonators (LWRs). The transverse acoustic wave characteristics are examined, and a resonance modulation theory on the regulation of mechanical boundary conditions is deducted. As examples of embodiments, vertical and lateral protrusion structur...
Conference Paper
Full-text available
This paper demonstrates a micro-total-analysis-system (Micro TAS) integrating eletrowetting-on dielectric (EWOD) droplet actuator with solidly mounted resonator (SMR) biosensor array, where biosensors in high spatial density are functionalized with different bioreceptors automatically. The platform is dedicated to high-throughput detection of biolo...
Article
We combined Reflection Difference Microscopy, electron transport measurements and Atomic Force Microscopy to characterize the mechanical and electrical anisotropy of few-layer black phosphorus. We were able to identify the lattice orientations of the two dimensional material and construct suspended structures aligned with specific crystal axes. The...
Article
Full-text available
Bulk acoustic wave (BAW) resonators are widely applied in filters and gravimetric sensors for physical or biochemical sensing. In this work, a new architecture of BAW resonator is demonstrated, which introduces a pair of reflection layers onto the top of a thin film bulk acoustic resonator (FBAR) device. The new device can be transformed between ty...