Optimum Annealing Temperature Research Articles

Magnetic properties of (Sm,Zr)(Fe,Co)5 alloys produced by the melt-spinning technique

The (Sm,Zr)(Fe,Co)5 alloys were prepared by the melt-spinning technique and subsequent annealing. The substitution of Zr for Sm stabilized the SmFe5 phase and resulted in a small increase in coercivity, while the substitution of Co for Fe also stabilized the SmFe5 phase and produced a slightly higher increase in coercivity. The substitution of both Zr for Sm and Co for Fe not only stabilized the SmFe5 phase but also significantly increased the coercivity. The (Sm,Zr)(Fe,Co)5 alloy with the optimal annealing temperature and composition exhibited a high coercivity of 4.75 kOe without nitrogenation.

Green synthesis of CuFeS2 nanoparticles using mimosa leaves extract for photocatalysis and supercapacitor applications

We successfully synthesized CuFeS2 nanoparticles (NPs) using a simple synthesis method mediated by touch me not (Mimosa pudica) leaves extract. X-ray diffraction (XRD) was used to analyze the structural properties, and it shows that the CuFeS2 NPs have a tetragonal structure and quasi-pyramidal NPs of an average crystallite size of 31.0 nm with a secondary phase of few minor peaks of covellite (CuS). The optical characterization showed that CuFeS2 NPs have band gap energy ranges of 1.98–2.46 eV for different annealing temperatures. The electrochemical properties of the CuFeS2 NPs were investigated using cyclic voltammetry (CV), galvanostatic charge discharge (GCD), and electrochemical impedance spectroscopy (EIS). An appreciable value of specific capacitance of 501.4 F/g was obtained at a scan rate of 10 mV/s for the CuFeS2 NPs annealed at 250 °C which can be said to be within the optimum ideal annealing temperature for CuFeS2 NPs. The CuFeS2 NPs was used in the photodegradation of methylene blue (MB) under of solar irradiation. The highest rate constant of 3.1 × 10−2 min−1 and degradation efficiency of 98% were obtained for the unannealed CuFeS2 NPs with good stability after three cycles. Therefore, the synthesized CuFeS2 NPs were obtained using a Mimosa pudica leaves extract prospective application in both electrochemical energy storage devices and treatment of water contaminants. GO was added to increase the active sites for these ions, surface area, and conductivity of these electrodes for enhanced supercapacitive performance.

The effect of adding graphene nanoparticles to the thermal performance of LiCo0.525Ni0.475O2 cathode materials in Li-ion batteries

In this work, the effect of adding graphene to the performance of layered LiCo0.525Ni0.475O2 (LCNO) cathode materials was investigated. Cathode materials LiCo0.525Ni0.475O2 (LCNO) were prepared using a self-propagating combustion reaction. Graphene (G) was added to the prepared compound (LCNO) in different weight percentages to obtain LCNO/G (LCNOG) to improve cathode performance. The powder was divided into four parts weighing 10 g each, and the parts were mixed with percentages weighing 0, 0.5, 2, 4 and 6% of graphene with 200 ml of ethanol; they were then stirred several times at room temperature to dry completely The effect of graphene weight percentages on LCNOG mass loss was studied using thermo-gravimetric analysis (TGA). It was concluded that all of the added percentages of graphene behaved the same in all temperatures, except for 6% added graphene, where it demonstrated inverse behaviour at a high temperature. To determine the optimum annealing temperature range, TGA was identified at 650, 750 and 850 °C for 12 hours in the air. The X-ray diffraction (XRD) patterns of the LCNO and LCNOG showed the crystallisation of all powders in the space group R-3m and hexagonal axes for the crystal system. Energy dispersive spectrometry (EDS), field emission scanning electron microscopy (FE-SEM), a vibrating sample magnetometer (VSM) and atomic force microscopy (AFM) were also used. The LCNOG surface morphology consisted of regular coverage of nano-crystalline grains and random orientation.

Enhanced thermoelectric properties of electrodeposited Bi2Te3 thin films using TiN diffusion barrier layer on a stainless-steel substrate and thermal annealing

Electrodeposition is an efficient wet-chemical approach to reduce the manufacturing cost of thin films. However, the thin films fabricated using this approach show properties inferior to those of the thin films fabricated using dry processes. In this study, a titanium nitride (TiN) diffusion barrier layer was formed on a stainless-steel (SS) substrate to improve the thermoelectric properties of electrodeposited Bi2Te3 thin films. The electrodeposition of the Bi2Te3 films was carried out in the potentiostatic mode using a standard three-electrode cell, followed by thermal annealing at 300–500°C. The X-ray diffraction and electron probe X-ray microanalysis results revealed that impurity diffusion from the SS substrate did not occur in the annealed films deposited on the TiN-coated SS substrate. However, the Bi2Te3-to-Bi4Te5 crystalline phase transformation occurred at higher annealing temperatures because of the preferential evaporation of Te atoms from the film surface, leading to the deterioration of the thermoelectric properties of the films. As a result, the 300°C-annealed film formed on the TiN-coated SS substrate showed the highest power factor of 4.4 μW/(cm·K2), which is approximately four times higher than that of the corresponding film formed on the bare SS substrate. Therefore, the TiN coating and optimum annealing temperature improved the thermoelectric properties of the electrodeposited Bi2Te3 thin films.

The preparation of Cu2ZnSnS4 thin film solar cell based on oxygen containing precursor

In this paper, we reported a new method to fabricate Cu2ZnSnS4 (CZTS) thin film solar cells. Oxygen containing precursor thin films were deposited on the Mo-coated soda lime glass (SLG) by sputtering ZnO, SnO2 and Cu targets. For getting higher quality CZTS thin films, the effects of different annealing temperatures of 380 °C, 480 °C, 580 °C and 650 °C on CZTS films were systematically investigated. The results showed that the optimum annealing temperature was 580 °C. Through optimizing the sulfurization process, phase-pure CZTS thin films with compact and large grains were obtained. Composition analysis showed that O was not detected after sulfurizing process which indicated all of O was replaced by S. And due to the stability of SnO2, the loss of tin can be avoided. In addition, ZnO not only can provide zinc sources, but also can decrease the thickness of MoS2 as a barrier layer. Finally, CZTS solar cells based on sputtering oxides targets were obtained and the preliminary fabricated CZTS thin film solar cells had an efficiency of 5.08%, with an open-circuit voltage of 645 mV, a short-circuit current density of 21.74 mA/cm2 and a fill factor of 36.23%.

Increased Stability of Palladium‐Iridium‐Gold Electrocatalyst for the Hydrogen Oxidation Reaction in Polymer Electrolyte Membrane Fuel Cells

AbstractThe development of non‐Pt hydrogen oxidation reaction catalysts for hydrogen‐fuelled polymer electrolyte fuel cells allows for an overall reduction in electrode Pt content and therefore helps reduce the cost of devices, one of the biggest commercial challenges. Herein, a novel ternary alloy catalyst supported on carbon, PdIrAu/C, has been synthesised, characterised and compared to the binary PdIr/C to show how the addition of Au improves the stability of the catalyst. Transmission electron microscopy was utilised to analyse electrode structure as a function of the synthesis method, showing the optimum annealing temperature, of those tested, to be 400 °C, while inductively‐coupled plasma mass spectrometry provided analysis of the degradation of the two catalysts, confirming the PdIrAu/C catalyst is more stable at potentials similar to those at a fuel cell anode than PdIr/C.

Origin of temperature-dependent performance of hole-transport-layer-free perovskite solar cells doped with CuSCN

Recently, a hole-transport-layer (HTL)-free structure was proposed to decrease the cost of organic lead halide perovskite solar cell (PSC) fabrication. In HTL-free PSCs, instead of using an HTL insertion, the HTL material can be added directly into a perovskite precursor solution to improve hole transport. For example, copper thiocyanate (CuSCN) is used for p-type doping of methylammonium lead triiodide (MAPI) via spin coating from a mixed solution. However, the optimum annealing temperature for CuSCN-doped MAPI (CuSCN:MAPI) PSCs is lower than the 100 °C that is typical for undoped MAPI PSCs. In this study, the origin of such lower annealing temperatures of CuSCN:MAPI PSCs is investigated. The highest power conversion efficiency (PCE) and enhanced electron transport in CuSCN:MAPI are obtained with annealing at 60 °C. Using transmission electron microscopy-energy-dispersive X-ray spectroscopy, it is revealed that annealing at 60 °C results in the uniform distribution of CuSCN, while the annealing at 100 °C induces the aggregation of CuSCN with a diameter of ~20 nm. A large energy barrier formed by the shallow-lying conduction band minimum of these CuSCN clusters hinders electron transport. The lower PCE of CuSCN:MAPI PSCs with annealing at 100 °C is attributed to this deterioration in the electron transport.

Triplex qRT-PCR with specific probe for synchronously detecting Bovine parvovirus, bovine coronavirus, bovine parainfluenza virus and its applications.

Bovine parvovirus (BPV), bovine coronavirus (BCoV) and bovine parainfluenza virus (BPIV) are common etiologies causing gastrointestinal and respiratory diseases in dairy herds. However, there are few reports on the synchronous detection of BPV, BCoV and BPIV. The present article aimed to develop a quick and accurate RT-PCR assay to synchronously detect BPV, BCoV and BPIV based on their specific probes. One pair universal primers, one pair specific primers and one specific probe was designed and synthesized. After the concentrations of primer and probe and annealing temperature were strictly optimized, the specificity, sensitivity and repeatability of the established triplex probe qRT-PCR were evaluated, respectively. The results showed the recombinant plasmids of pMD18-T-BPV, pMD18-T-BCoV and pMD18-T-BPIV were 554bp, 699bp and 704bp, respectively. The optimal annealing temperature was set at 45.0°C for triplex qRT-PCR. The triplex probe qRT-PCR can only synchronously detect BPV, BCoV and BPIV. Detection sensitivities were 2.0×102, 2.0×102 and 2.0×101 copies/μL for BPV, BCoV and BPIV, being 1000-fold greater than that in the conventional PCR. Detection of clinical samples demonstrated that triplex probe qRT-PCR had a higher sensitivity and specificity. The intra-assay and inter-assay coefficient of variation were lower than 2.0%. Clinical specimens verified that the triplex qRT-PCR had a higher sensitivity and specificity than universal PCR. In conclusion, this triplex probe qRT-PCR could detect only BPV, BCoV and BPIV. Minimum detection limits were 2.0×102 copies/μL for BPV and BCoV, and 2.0×101 copies/μL for BPIV. The sensitivity of this triplex probe qRT-PCR was 1000-fold greater than that in the conventional PCR. The newly qRT-PCR could be used to monitor or differentially diagnose virus infection.

Integrated qPCR and Staining Methods for Detection and Quantification of Enterocytozoon hepatopenaei in Shrimp Litopenaeus vannamei.

Enterocytozoon hepatopenaei (EHP) is an obligate, intracellular, spore-forming parasite, which mainly infects the gastrointestinal tract of shrimp. It significantly hinders the growth of shrimp, which causes substantial economic losses in farming. In this study, we established and optimized a SYBR Green I fluorescent quantitative PCR (qPCR) assay based on the polar tube protein 2 (PTP2) gene for the quantitative analysis of EHP-infected shrimp. The result showed that the optimum annealing temperature was 60 °C for the corresponding relation between the amplification quantitative (Cq) and the logarithmic of the initial template quantity (x), conformed to Cq = −3.2751x + 31.269 with a correlation coefficient R2 = 0.993. The amplification efficiency was 102%. This qPCR method also showed high sensitivity, specificity, and repeatability. Moreover, a microscopy method was developed to observe and count EHP spores in hepatopancreas tissue of EHP-infected shrimp using Fluorescent Brightener 28 staining. By comparing the PTP2-qPCR and microscopy method, the microscopic examination was easier to operate whereas PTP2-qPCR was more sensitive for analysis. And we found that there was a correspondence between the results of these two methods. In summary, the PTP2-qPCR method integrated microscopy could serve for EHP detection during the whole period of shrimp farming and satisfy different requirements for detecting EHP in shrimp farming.

Low-Temperature Thermally Evaporated SnO₂ Based Electron Transporting Layer for Perovskite Solar Cells with Annealing Process.

Perovskite solar cells (PSCs) represent the third generation of solar cells that comprise a semiconductor electrode, a counter electrode, and an electrolyte. Perovskite solar cells (PSCs) have been comprehensively researched and led to an impressive improvement in a short period of time as cheaper alternatives to silicon solar cells due to their high energy-conversion efficiency and low production cost. Tin oxide (SnO₂) has attracted attention as a promising candidate for electron transport material of perovskite solar cells, because it can be easily processed by low annealing temperature and solution processing method. However, in the fabrication of SnO₂ electron transfer layer (ETL) via the conventional solution method, it is greatly difficult to increase the size of the substrate by the solution treatment method or to commercialize it. In this work, we report the photovoltaic characteristics of SnO₂ based electron transport layer for perovskite solar cells (PSCs) fabricated by the thermal-evaporation processing method. The deposited SnO₂ layer with the thermal evaporator is known to be not crystallographically stable. To solve this problem, we performed the annealing process at relatively low temperature (below 200 °C). As a result, we could confirm the optimum annealing temperature and we could demonstrate PSCs with thermally deposited SnO₂ as the compact electron transport layer through a low-temperature annealing process. It would contribute to new opportunities in commercialization and development of perovskite solar cells.

Preliminary Identification of Human Leukocyte Antigen (HLA) CLASS II DRB1 Allelic Variants in Selected Filipino Cancer Patient Samples

Objective. The Human Leukocyte Antigen (HLA) Class II is the major histocompatibility complex surface glycoproteins of humans responsible for presenting exogenous antigenic peptides which help direct specificity of immune response. In immune-cell therapy, the HLA allelic variants are of particular importance as they determine the successful activation of target cells that results to a desired therapeutic response. However, HLA Class II exhibits high polymorphism and has variable distribution in population, constituting these so-called allelic variants. Specifically, the HLA Class II DRB1 is considered the predominant locus among Filipinos. This research aimed to identify the presence of HLA Class II DRB1 allelic variants in the stem cell samples of ten (10) Filipino cancer patients by reverse transcription polymerase chain reaction (RT-PCR) amplification.Method. This study employed a PCR-based HLA Class II typing to identify the HLA Class II DRB1 allelic variant in Filipino cancer patients. Design of forward and reverse primers for HLA Class II DRB1, optimization of PCR conditions for amplifying HLA Class II DRB1, and identification of HLA Class II DRB1 allelic variants from samples by sequencing and database comparison were conducted.Results. PCR optimization showed that optimum annealing temperature for HLA DRB1 was 58.8°C with 1 mM MgCl2. PCR amplification of HLA DRB1 from ten anonymized cancer patient samples and DNA sequencing revealed that Patients 1, 2, 5, 8, 9, and 10 harbor HLA DRB1 allelic variants, particularly, the HLA DRB1*04:06:01, HLA DRB1*12:01:01, HLA DRB1*0813, HLA DRB1*04:05:01, HLA DRB1*09:01:02, and HLA DRB1*16:02:01, allelic variants, respectively.Conclusion. Using the designed primers and optimized RT-PCR protocol, HLA information derived from six out of ten patient samples can be used for further applications in developing personalized or generic antigenic peptides such as dendritic cell cancer vaccine.

Nanostructure, optical and electrical properties of p-NiO/n-Si heterojunction diodes

Evolutions on structural, morphological, optical and electrical characteristics of Pt/p-NiO/n-Si/Al thin-film heterojunction diodes before and after various thermal annealing temperatures have been investigated in details. Increases in the annealing temperature improve the crystalline structures of the films, i.e., stress on the film decreases and grain size of the film increases after annealing. The surface roughness of the films enhances from 3.60 to 4.59 nm, especially after 600 °C annealing. This rise in the surface roughness is possible due to the increase in the grain size of the films which causes swelling effect after high-temperature annealing. The energy band gap of the NiO films changes from 3.43 eV to 3.34 eV after annealing temperature up to 450 °C, while it slightly increases after 600 °C annealing process. These observed variations on the band gap values are due to the changes on the crystalline, microstructure and interfacial parameters of the films. On the other hand, the surface modifications also affect the electrical characteristics of the heterojunction diodes. The lowest sheet resistance is obtained to be 65.2 Ω/sq after 450 °C annealing process. Reverse saturation current increases up to 34.1 nA and barrier height also decreases from 0.82 eV to 0.75 eV depending on the annealing temperature. In addition, the lowest value of the ideality factor is obtained to be 1.51 for the diodes annealed at 450 °C. It can be concluded that the annealing-induced surface modifications significantly affect the electrical performance of the diodes and the optimum annealing temperature is 450 °C for the heterojunction diode applications of the p-NiO/n-Si films.

A Facile Synthesis and Characterization of Highly Crystalline Submicro-Sized BiFeO3.

In this study, a highly crystalline bismuth ferrite (BFO) powder was synthesized using a novel, very simple, and cost-effective synthetic approach. It was demonstrated that the optimal annealing temperature for the preparation of highly-pure BFO is 650 °C. At lower or higher temperatures, the formation of neighboring crystal phases was observed. The thermal behavior of BFO precursor gel was investigated by thermogravimetric and differential scanning calorimetry (TG-DSC) measurements. X-ray diffraction (XRD) analysis and Mössbauer spectroscopy were employed for the investigation of structural properties. Scanning electron microscopy (SEM) was used to evaluate morphological features of the synthesized materials. The obtained powders were also characterized by magnetization measurements, which showed antiferromagnetic behavior of BFO powders.

Effect of Thermomechanical Cycling on Martensitic Transformation and Shape Memory Effect in 304 Austenitic Steel

To improve the shape memory effect (SME) of 304 austenitic steel effectively and efficiently, thermomechanical cycling, comprising deformation at room temperature and annealing, was applied. The influences of cycle number and annealing temperature on the SME and microstructures in 304 austenitic steel were investigated by light microscope (LM), X-ray diffraction (XRD), and transmission electron microscope (TEM). The shape recovery ratio was remarkably improved from 16% to 40% after two thermomechanical cycles. The optimum annealing temperature was 833 K in the process of thermomechanical cycling. The improved SME by thermomechanical cycling was mainly related to stress-induced ε martensite rather than stress-induced α’ martensite. The reason is that thermomechanical cycling can not only promote the occurrence of the stress-induced γ→ε martensitic transformation, but also suppress the subsequently stress-induced ε→α′ transformation.

Effect of Tempering Temperature after Thermo-Mechanical Control Process on Microstructure Characteristics and Hydrogen-Induced Ductility Loss in High-Vanadium X80 Pipeline Steel.

In this study, an optimum tempering temperature after a thermo-mechanical control process (TMCP) was proposed to improve the hydrogen-induced ductility loss of high-vanadium X80 pipeline steel. The results showed that with increasing tempering temperature from 450 to 650 °C, the size and quantity of granular bainite decreased but the spacing of deformed lath ferrite and the fraction of massive ferrite increased. The number of fine vanadium carbides increased as well. However, as the tempering temperature increased to 700 °C, the microstructure of T700 steel completely converted to massive ferrite and the grain size became larger. Additionally, the amount of nanoscale precipitates decreased again, and the mean size of precipitates evidently increased in T700 steel. The steel tempering at 650 °C, containing the most vanadium precipitates with a size less than 20 nm, had the lowest hydrogen diffusion coefficient and the best resistance to hydrogen-induced ductility loss.

Influence of Thermal Processing Factors, Linked to the Destabilisation of Austenite, on the Microstructural Variation of a White Cast Iron Containing 25% Cr and 0.6% Mo

Hypoeutectic white cast irons containing 25% Cr are used in ore-processing industries due to their high resistance to erosive wear. Applying a Design of Experiments (DoE), the aim of this study is to analyse the influence of thermal processing factors on the microstructural variation of a white cast iron containing 25% Cr and 0.6% Mo. The carbides present in the as-cast state are of the M7C3, M2C, and M3C types. M2C carbides precipitate on the eutectic M7C3 carbides favoured by heterogeneous nucleation conditions. Two kinetics compete during the destabilisation of austenite. One dissolves those eutectic carbides precipitated as a result of non-equilibrium solidification (M7C3 and M2C), while the other enables the precipitation of secondary M7C3 and M23C6 carbides. The M7C3 carbides begin to precipitate first. Low destabilisation temperatures and short dwell times are insufficient to dissolve the precipitated eutectic carbides from non-equilibrium conditions, thus favouring the presence of M2C carbides, which are associated with Mo. The factor that has the greatest influence on hardness is the tempering temperature. The optimal tempering temperature is found to be 500 °C. Short tempering times maintain the distortion of the ferrite unit cell. The precipitation of Cr carbides during tempering requires a temperature of 500 °C and the prior dissolution of the carbon precipitated during the initial stages of said tempering. With short tempering times, the Cr atoms still remain dissolved in the ferrite, distorting its unit cell and increasing the hardness of the matrix constituent of the alloy.

Soft-Magnetic High-Entropy AlCoFeMnNi Alloys with Dual-Phase Microstructures Induced by Annealing

The simultaneous enhancement of magnetic and mechanical properties is desirable but challenging for soft-magnetic materials. A fabrication strategy to meet this requirement is therefore in high demand. Herein, bulk equiatomic dual-phase AlCoFeMnNi high-entropy alloys were fabricated via a magnetic levitation induction melting and casting process followed by annealing at 700–1000 °C, and their microstructures as well as mechanical and magnetic properties were investigated. The as-cast alloy possessed a single metastable B2-ordered solid solution that decomposed upon annealing into a dual-phase structure comprising an Al- and Ni-rich body-centered cubic (BCC) matrix and Fe- and Mn-rich face-centered cubic (FCC) precipitates both in the grain interior and along the grain boundaries. The magnetic and mechanical properties were closely related to the relative volume fraction of FCC in the alloy. The FCC volume fraction could be increased by increasing the annealing temperature, thereby offering tunable properties. The optimal annealing temperature for balanced magnetic and mechanical properties was found to be 800 °C. The alloy annealed at this temperature had an average BCC grain size of 12 ± 3 μm and FCC volume fraction of 41 ± 4%. Correspondingly, the saturation magnetization and coercivity reached 82.57 Am2/kg and 433 A/m, respectively. The compressive yield strength and fracture strength were 1022 and 2539 MPa, respectively, and the plasticity was 33%. Owing to its adjustable microstructure and properties, the AlCoFeMnNi alloy has potential for use as a multi-functional soft-magnetic material.

A Two-Step Annealing Method to Enhance the Pyroelectric Properties of Mn:PIMNT Chips for Infrared Detectors.

Mn:0.15Pb(In1/2Nb1/2)O3-0.55Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 (Mn:PIMNT) pyroelectric chips were prepared by a two-step annealing method. For the two steps, annealing temperatures dependence of microstructure, defects, surface stress, surface roughness, dielectric properties and pyroelectric properties were studied comprehensively. The controlling factors influencing the pyroelectric properties of the Mn:PIMNT crystals were analyzed and the optimum annealing temperature ranges for the two steps were determined: 600–700 °C for the first step and 500–600 °C for the second step. The pyroelectric properties of the thin Mn:PIMNT chips were significantly enhanced by the two-step annealing method via tuning oxygen vacancies and eliminating surface stress. Based on Mn:PIMNT pyroelectric chips annealed at the most favorable conditions (annealed at 600 °C for the first step and 500 °C for the second step), infrared detectors were prepared with specific detectivity D* = 1.63 × 109 cmHz1/2W−1, nearly three times higher than in commercial LiTaO3 detectors.

Mechanical properties and stability of precipitates of an ODS steel after thermal cycling and aging

Abstract The thermal stability of an ODS RAF steel has been investigated by assessing the effects of different thermal treatments on its microstructure and mechanical behavior. The ODS steel, with nominal composition Fe–14Cr–2W–0.4Ti-0.3Y2O3 (wt. %), was manufactured by mechanical alloying, compacted by hot isostatic pressing and hot cross rolling. Following the rolling process, short thermal treatments at temperatures between 1073 and 1473 K were applied, and an optimal annealing temperature of 1273 K was selected. Afterwards, two independent thermal treatments were applied. To check the effects of thermal fatigue, a set of samples was submitted to thermal cycling between 773 and 1073 K. Finally, another batch was thermally aged at 873 K for 2000 h. A Vickers microhardness analysis shows a hardening effect with the thermal cycling and the aging treatments. The cycling treatment causes a small improvement of yield and tensile strengths at test temperatures T > 773 K, without clear ductility changes. The aging treatment slightly enhances tensile properties for tests at T > 873 K, together with loss of strength and ductility in tests at T

Electrical and infrared responses of n-VO2/p-GaAs heterojunctions based on VO2 phase transition properties

In this investigation, high-quality VO2 films were prepared on p-GaAs wafers by DC magnetron sputtering and post-annealing process. The results indicate that the optimum annealing temperature and time of the sample are 2 h and 420 °C with the excellent rectification characteristics originated from the n-VO2/p-GaAs interface before the occurrence of semiconductor-to-metal phase transition in VO2, which can be explained by the thermal electron emission model. The device’s threshold voltage at 30 °C and 60 °C corresponds to 7.5 and 6 V. The responsivity of the as-fabricated photon detector under 980 and 1310 nm laser illumination was 0.013 and 0.022 A W−1 at an applied bias of 3 V as well as 0.0025 and 0.0048 A W−1 at zero bias, respectively. The NIR transmittance decreases with increasing voltage and temperature due to the combination of voltage and temperature to induce VO2 phase transition. The results will be beneficial to explore and improve the IR photon detector based on VO2 and provide ideas for new optoelectronic devices with phase transition characteristics.