Li-Yuan Zhu's research while affiliated with Fudan University and other places

Publications (24)

Article
Full-text available
With the rapid development of the Internet of Things, there is a great demand for portable gas sensors. Metal oxide semiconductors (MOS) are one of the most traditional and well-studied gas sensing materials and have been widely used to prepare various commercial gas sensors. However, it is limited by high operating temperature. The current researc...
Article
Hierarchical Nb2O5@ZnO hetero-branched nanorods used for highly responsive, selective, and stable hydrogen sulfide (H2S) sensors were synthesized through a sequential process combining a hydrothermal method, atomic-layer-deposition processing, and modified hydrothermal processing for branching ZnO nanowires. The Nb2O5@ZnO hetero-branched nanorod se...
Article
Highly selective and sensitive H2S sensors are in high demand in various fields closely related to human life. However, metal oxide semiconductors (MOSs) suffer from poor selectivity and single MOS@metal organic framework (MOF) core–shell nanocomposites are greatly limited due to the intrinsic low sensitivity of MOF shells. To simultaneously improv...
Article
A stretchable pressure sensor with interlinked interfaces was fabricated by a template-free process. The sensor was composed of stretchable silver nanowire (AgNW)/carbon nanotube (CNT) electrodes and piezoresistive polydimethylsiloxane (PDMS)/CNT foam. The electrode was fabricated by embedding conductive nanoparticles in PDMS, showing a low sheet r...
Article
Deep ultraviolet (DUV) phototransistors are key integral of optoelectronics bearing a wide spectrum of applications in flame sensor, military detector, oil spill detection, biological sensor, and artificial intelligence fields. In order to further improve the responsivity of UV photodetectors based on β-Ga2O3, in present work, high-performance β-Ga...
Article
Heterostructured Nb2O5/SnO2 core-shell nanorods are synthesized by a facile hydrothermal strategy and atomic layer deposition (ALD). The SnO2 shell thicknesses varying from 7 to 34 nm exhibit a significant impact on sensing performance. The response enhancement mechanism of the Nb2O5/SnO2 core-shell nanorods is illustrated based on the electron-dep...
Article
The development of high-performance H2S sensor is imperative for monitoring H2S in the living environment. Metal oxide semiconductors (MOSs) have been regarded as the strongest candidates for H2S detection due to their high sensitivity, miniaturization, and good durability. However, a single MOS-based gas sensor is unable to selectively detect gase...
Article
Highly sensitive and stable acetone gas sensors based on MEMS substrate supported carbon nanoparticles decorated mesoporous α-Fe2O3 (C-d-mFe2O3) nanorods (NRs) derived from Fe-MIL-88B-NH2 NRs were first synthesized via a sequential process including a facile hydrothermal reaction and one-step pyrolysis at a moderate temperature in air. The MEMS arc...
Article
Stretchable strain sensor, an important paradigm of wearable sensor which can be attached onto clothing or even human skin, is widely used in healthcare, human motion monitoring and human-machine interaction. Pattern-available and facile manufacturing process for strain sensor is pursued all the time. A carbon nanotube (CNT)/ silver nanowire (AgNW)...
Article
A high optoelectronic performance ReS2/ReSe2 van der Waals (vdW) heterojunction phototransistor utilizing thin hafnium oxide (HfO2) as a local-back-gate dielectric layer was prepared and studied. The heterojunction-based phototransistor exhibits a superior electrical performance with a large rectification ratio of ∼103. Furthermore, unlike diode-li...
Article
Zinc tin oxide (ZTO) thin films can be deposited by atomic layer deposition (ALD) with adjustable electrical, optical and structural properties. However, the ternary ALD processes usually suffer from low growth rate and difficulty in controlling film thickness and elemental composition, due to the interaction of ZnO and SnO2 processes. In this work...
Article
As an indispensable and prevailing kind of flexible sensors, pressure sensors have been extensively used in the field of flexible electronics. To enhance the performance and broaden the applications of flexible pressure sensors, emerging nanomaterials with excellent electromechanical properties have been explored and developed over recent years. He...
Article
The increase of homocysteine (Hcy) is closely related with the development of many diseases. Nevertheless, the effective detection of Hcy remains challenging due to the lack of a simple, specific, and cost-efficient method. Herein, an electrochemical biosensor based on Hcy aptamer/Au nano-particles/graphene sponge (Aptamer/Au NPs/GS) was designed f...
Article
A simple and effective preparation method was proposed to improve acetone gas sensing performance based on ZnO branched p-Cux[email protected] nanowires (NWs) by hydrothermal processing and atomic layer deposition technique. The gas sensor was fabricated on micro-electromechanical systems with lower power consumption and better integrated circuit c...
Article
Full-text available
Highly sensitive and selective hydrogen sulfide (H2S) sensors based on hierarchical highly ordered SnO2 nanobowl branched ZnO nanowires (NWs) were synthesized via a sequential process combining hard template processing, atomic-layer deposition, and hydrothermal processing. The hierarchical sensing materials were prepared in situ on microelectromech...
Article
Hierarchical heterostructured photoanodes have been considered as ideal candidate for oxidation in effort to enhance the photoelectrochemical (PEC) performance. In this work, well-defined WO3@TiO2-Fe2O3 nanodendrite arrays composed of WO3@TiO2 core-shell nanosheets and Fe2O3 nanorods are synthesized by atomic layer deposition and subsequent hydroth...
Article
Preparation of reliable, stable and highly responsive gas sensing devices for detection of acetone has been considered to be a key issue for development of accurate disease diagnose systems via exhaled breath. In this paper, novel CeO2 nanodots-decorated WO3 nanowires are successfully synthesized through a sequential hydrothermal and thermolysis pr...
Article
Development of high-performance ammonia (NH3) sensor is imperative for monitoring NH3 in the living environment. In this work, to obtain a high performance NH3 gas sensor, structurally well-defined WO3@SnO2 core shell nanosheets with a controllable thickness of SnO2 shell layer have been employed as sensing materials. The prepared core shell nanosh...
Article
The α-Fe2O3/ZnO core-shell nanowires (NWs) on micro-electro-mechanical system structure were prepared for hydrogen sulfide (H2S) gas sensing. Core α-Fe2O3 NWs were prepared by thermal oxidation and the ZnO shell layer was coated by atomic layer deposition, respectively. The diameter of the obtained α-Fe2O3/ZnO core-shell NWs increases uniformly wit...
Article
Highly sensitive and selective gas sensors based on heterostructured p-CuO/n-SnO 2 core-shell nanowires (NWs) with precisely controlled shell thickness were synthesized through a sequential process combining a solution processing and atomic layer deposition. The gas sensing devices were fabricated on micro-electromechanical systems, which has trigg...
Article
Full-text available
Atomic scale control of the thickness of thin film makes atomic layer deposition highly advantageous in the preparation of high quality super-lattices. However, precisely controlling the film chemical stoichiometry is very challenging. In this study, we deposited SiOx film with different stoichiometry by plasma enhanced atomic layer deposition. Aft...
Article
Full-text available
The ZnO-based nanogenerators (NGs) with a precisely controlled interlayer of AlN are fabricated based on atomic layer deposition technique, which was proved to possess an enhanced output signal. The microstructure and composition profiles of the prepared ZnO/AlN stack layer are well characterized first. It was found that the piezoelectric performan...

Citations

... Nowadays, metal oxides in the form of thick or thin films, which operate at elevated temperatures, ordinarily up to 400 • C, are widely used to design gas sensors of a chemiresistive type [1][2][3]. In order to reduce the working temperature and to advance the sensitivity, other materials are considered to meet the challenges of various current applications, including the Internet of Things [4]. Since the beginning of the XXI century, two-dimensional materials, primarily matured from a one atom-thick layer of carbon, called graphene [5], started to develop rapidly [1,6]. ...
... Furthermore, (ii) the acetone molecules formed a significant dipole moment due to the presence of the C-C=O group. It encourages the chemical adsorption/desorption and redox reaction capability of the WS2 nanorod sensor material [3,54]. concentrations. ...
... The photographs of the fabricated MWCNT-, graphene-, and MWCNT/graphene hybridbased sensors are shown in Fig. 1a. In order to avoid excessive confinement of the sensing materials on the Ecoflex surface [7,25,26], the MWCNT and graphene are directly spray-coated on the sticky Ecoflex surface [27,28] and tested without encapsulation. Scanning electron microscopy (SEM) images of graphene and MWCNT coated on a glass substrate are shown in Additional file 1: Fig. S1a and S1b. ...
... Finally, the whole sample was coated with a 15 nm thick HfO2 by atomic layer deposition. Further ALD details can be found in the references 24,25 . Fig. 3a (Fig. 3c). ...
... Carbonaceous material and metals are commonly adopted as nanofillers integrated with a flexible substrate to act as strain/pressure sensors. For example, carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) are two representative materials that have attracted extensive attention because of their outstanding properties and various forms [103]. Huang et al. demonstrated a wearable strain sensor based on multiwalled carbon nanotubes (MWCNT), which were encapsulated by PDMS to prevent the fragile conductive filler from stress-induced damage [104]. ...
... Mechanical stretching [14], annealing [15,16], and electric-powered poling with an excessive electric field are the most popular methods of achieving the β phase, but they are also expensive and time-demanding. There is evidence that the β phase may be obtained and improved by introducing various nucleating fillers like barium titanate [17], zinc oxide [18], carbon nanotubes [19], nanowires [20], silver nanoparticles [21], and so on. Besides this, modeling clay must be annealed at room temperature to reach the β phase, which is a facile and feasible approach to acquiring piezoelectricity [13,22]. ...
... Through a simple breath analysis, many diseases can be diagnosed and therapeutic monitored noninvasively [42,43]. For instance, ammonia and fatty acids are found in the breath of patients with cirrhosis, while acetone and isoprene are found in the breath of patients with diabetes [44][45][46]. However, the conventional technology of breath analysis requires bulky and expensive equipment, long time-consumption and well-trained personnel. ...
... Such a temperature sensor offers the advantages of compactness, stability and ease of fabrication. As a quasi-one-dimensional oxide wide-band semiconductor nanomaterial, zinc oxide nanowires, due to their high specific surface area and sufficient electrical conductivity, are used in sensor devices for the detection of hydrogen sulphide [92], hydrogen [93,94], ethanol [95][96][97], benzene and toluene [98]. Such devices gain distinct advantages over commercially available sensors [99][100][101][102] and provide increased selectivity and reduced energy consumption. ...
... Consistent with the XRD patterns, for TiO 2 array (I), the experimentally observed Raman modes of E g at 442 cm − 1 and A 1g at 611 cm − 1 corresponding to rutile TiO 2 [32]. Raman modes at 267 cm − 1 , 330 cm − 1 , 710 cm − 1 and 808 cm − 1 of the WO 3 directly grown on FTO glass (II) were obviously observed, of which the bands at 267 cm − 1 and 330 cm − 1 are attributed to the bending or deformation of the O-W-O equatorial bonds within the octahedra of h-WO 3 , the bands at 710 cm − 1 and 803 cm − 1 are attributed to the stretching vibrations of O-W-O [33,34]. In terms of the WO 3 grown on TiO 2 arrays (III), the Raman spectrum demonstrates characteristic bands both of WO 3 and TiO 2 , suggesting that the WO 3 has been successfully incorporated with TiO 2 to form a composite nanostructure. ...
... It illustrates that the depletion layer and potential barrier are created during the adsorption and active site (O − ) formation on the WS2 nanorod sensor. Similar reports have studied and discussed the exploration of the concept of the creation of active oxygen ions/sites in the literature [71][72][73]. Figure 8d reveals the graphical visualization of the interaction between acetone molecules and the active site (O − ) on the WS2 nanorod sensor surface, following the process discussed in Equation (7), showing the liberation of CO2 gas, H2O, and electrons in the conduction band of the WS2 nanorod. Figure 8e discloses an illustration of the acetone-sensing mechanism (as discussed in Equation (7)) on the WS2 nanorod sensor surface and the release of carbon dioxide, water, and electrons. ...