Heterostructure System Research Articles

Geometric and anisotropy effects on voltage driven magnetic switching behaviors in nanoscale multiferroic heterostructure

Voltage driven magnetic switching (VDMS) in multiferroic heterostructure is highly demanded for next generation energy efficient high-density memory (e.g. magnetoelectric random access memory) and spintronic devices. For practical applications in large scale integrated device, it is imperative to understand the VDMS behaviors in nanometer scale. In this work, we have investigated the effects of geometric and anisotropy parameters on 180° VDMS behaviors in a model multiferroic heterostructure system consisting of Co nano-ellipse on BiFeO3 films by using micromagnetic simulation. It was revealed that the switching behaviors can be greatly affected by geometric factors, whereby dimension shrinkage and rising aspect ratio of Co nano-ellipse can apparently increase the critical exchange coupling field (hDMcri-field) needed for triggering the VDMS, greatly reducing the watchability of VDMS. To improve the watchability, an external static perpendicular magnetoanisotropy (Kp) can be introduced to reduce the hDMcri-field, whereas too large Kp tends to reorientate the magnetization towards out-of-plane orientation. Moreover, a strategy was also proposed to assist the VDMS by applying an anisotropy pulse, which is able to reduce the hDMcri-field and expand the switching window (e.g. wider range of aspect ratio and overall dimension size) for both in-plane and out-of-plane VDMS. These results may provide some guides for further experimental modulation of VDMS for device applications.

Reconstructing Dual‐Induced {0 0 1} Facets Bismuth Oxychloride Nanosheets Heterostructures: An Effective Strategy to Promote Photocatalytic Oxygen Evolution

Sunlight‐driven photocatalytic water splitting to generate oxygen (O2) is a promising approach for utilizing solar energy. Herein, direct Z‐scheme heterostructure photocatalysts composed of ultrathin Bi3O4Cl and BiOCl nanosheets are rationally fabricated via alkaline chemical etching and solvent exfoliation for O2 evolution under visible light. With AgNO3 and FeCl3 as the electron scavenger, the optimized ultrathin Bi3O4Cl/BiOCl exhibits prominent photocatalytic activity for O2 production under visible‐light illumination and the production rate (Fe3+: 58.6 µmol g−1 h−1) is much higher than the nanocrystal heterostructure (Fe3+: 28.5 µmol g−1 h−1). This ultrathin heterostructure system can efficiently transfer the electrons, which leads to a considerable improvement in the photocatalytic performance. Due to the suitable band edge potentials and the intense electronic interaction between two‐dimensional (2D) Bi3O4Cl and 2D BiOCl, as confirmed by theoretical computations, photoluminescence, and photoelectricity tests, the ultrathin heterojunction with an internal electric field has a highly remarkable charge transfer. The intimate interface contact and {0 0 1} facets effect promote the high photocatalytic performance of the ultrathin Bi3O4Cl/BiOCl heterostructure.

Interfacial structure and electronic properties of TiO2/ZnO/TiO2 for photocatalytic and photovoltaic applications: A theoretical study

Understanding interface properties of heterojunction is an important step towards controllable and tunable interfaces for photocatalytic and photovoltaic based devices. To this aim, we propose a thorough study of a double heterostructure system consisting of two semiconductors with large band gap, namely, wurtzite ZnO and anatase TiO2. We demonstrate via first-principle calculations two stable configurations of ZnO/TiO2 interfaces. Our structural analysis provides a key information on the nature of the complex interface and lattice distortions occurring when combining these materials. The study of the electronic properties of the sandwich nanostructure TiO2/ZnO/TiO2 reveals that conduction band arises mainly from Ti3d orbitals, while valence band is maintained by O2p of ZnO, and that the trapped states within the gap region frequent in single heterostructure are substantially reduced in the double interface system. Moreover, our work explains the origin of certain optical transitions observed in the experimental studies. Unexpectedly, as a consequence of different bond distortions, the results on the band alignments expect different electron accumulation between the two interfaces. Such behavior provides more choice for the sensitization and functionalization of TiO2 surfaces.

Flexible and Ultrasoft Inorganic 1D Semiconductor and Heterostructure Systems Based on SnIP

AbstractLow dimensionality and high flexibility are key demands for flexible electronic semiconductor devices. SnIP, the first atomic‐scale double helical semiconductor combines structural anisotropy and robustness with exceptional electronic properties. The benefit of the double helix, combined with a diverse structure on the nanoscale, ranging from strong covalent bonding to weak van der Waals interactions, and the large structure and property anisotropy offer substantial potential for applications in energy conversion and water splitting. It represents the next logical step in downscaling the inorganic semiconductors from classical 3D systems, via 2D semiconductors like MXenes or transition metal dichalcogenides, to the first downsizeable, polymer‐like atomic‐scale 1D semiconductor SnIP. SnIP shows intriguing mechanical properties featuring a bulk modulus three times lower than any IV, III‐V, or II‐VI semiconductor. In situ bending tests substantiate that pure SnIP fibers can be bent without an effect on their bonding properties. Organic and inorganic hybrids are prepared illustrating that SnIP is a candidate to fabricate flexible 1D composites for energy conversion and water splitting applications. SnIP@C3N4 hybrid forms an unusual soft material core–shell topology with graphenic carbon nitride wrapping around SnIP. A 1D van der Waals heterostructure is formed capable of performing effective water splitting.

Strategy for improving the visible photocatalytic H2 evolution activity of 2D graphitic carbon nitride nanosheets through the modification with metal and metal oxide nanocomponents

The semiconductor based photocatalytic water splitting is a promising approach for the production of environmentally friendly, clean, and cost-effective hydrogen fuel by utilizing the solar energy. Graphitic carbon nitride (g-C3N4) has emerged as an excellent material to produce hydrogen via photocatalytic water splitting reactions, however the limited visible light absorption and fast charge recombination restricts the further real practical applications. Fabrication of multicomponent g-C3N4 based heterostructured photocatalytic system is an effective strategy to enhance the charge separation and thereby photocatalytic efficiency. Here, a new g-C3N4-Au-In2O3 ternary system with efficient photogenerated charge carrier separation is successfully designed. The morphology, structure, phase and electronic environments of g-C3N4, Au and In2O3 in the composite were studied by different characterization methods. As expected, the optimized g-C3N4-Au-In2O3 catalyst shows excellent photocatalytic H2 evolution rate. The improved photocatalytic H2 evolution rate could be attributed to the formation of heterojunctions between g-C3N4, Au and In2O3 components; improved visible light harvesting via surface plasmon resonance (SPR) effect of metal Au nanoparticles (NPs); and effective photogenerated electron-hole pairs separation. The proposed work is expected to provide a new concept to fabricate g-C3N4 based ternary heteronanostructures with metal NPs and metal oxide semiconductors not only to a photocatalytic applications but also opens up to variety of optoelectronic applications.

Z-scheme carbon-bridged Bi2O3/TiO2 nanotube arrays to boost photoelectrochemical detection performance

An effective photoelectrochemical sensor is urgently needed for monitoring of the environmental pollution caused by organic wastes. In this work, we report a facile in-situ illumination-assisted process to introduce uniform metal oxide (Bi2O3) nanocrystals of 2–3 nm in sizes on carbon bridged TiO2 nanotube arrays (TiO2 NTAs) (Bi2O3/C@TiO2 NTAs), in which the carbon functions as both electron trapping for high efficiency and system integration. The Bi2O3/C@TiO2 NTAs thus made exhibit a highly selective photoelectrochemical determination performance, with low background photocurrent (derived from the decomposition of water) and high detection current (derived from the decomposition of organics target). In particular, the current detection of the Bi2O3/C@TiO2 NTAs is 3.38 times higher than that of the pristine TiO2 NTAs. To understand the key working principles involved, they are scrutinized by probing into the photoelectrochemical reaction process, including the light absorption, charge separation and transfer, and surface reactions. With the novel Z-scheme heterostructure system being achieved with Bi2O3/C@TiO2 NTAs, the present work demonstrates the potential of metal oxides with uniform size in nanometer range and conductor-bridged strategy in creating Z-scheme heterostructure system with high photoelectrochemical detection performance for organics.

Insight into the energy band alignment of magnetically separable Ag2O/ZnFe2O4 p-n heterostructure with rapid charge transfer assisted visible light photocatalysis

The fabrication of highly efficient catalysts with easy recyclability has received great attention in the development of realistic photocatalytic applications. Herein, a magnetically separable Ag2O/ZnFe2O4 p-n heterostructure photocatalyst was fabricated and utilized for the degradation of BPA under visible light irradiation. Results show that the obtained AZ-3 composite possesses the optimal performance, which is about 2.33-fold and 34.45-fold higher than that of Ag2O and ZnFe2O4, respectively. The enhanced performance is attributed to the rapid separation of photogenerated electrons and holes caused by the built-in electric field between p-type Ag2O and n-type ZnFe2O4, as detailedly evidenced by photoelectrochemical measurements. Moreover, density functional theory (DFT) calculations show that the electrons around the contact interface of Ag2O and ZnFe2O4 will be redistributed after their hybridization, while the investigation on energy band alignment further indicates that a type-II band alignment with ΔECBO = 0.16 eV and ΔEVBO = 0.65 eV is formed in this p-n heterostructure, which provides a solid support for the reaction mechanism. This work gives deep insights into the charge transfer properties of p-n heterostructure systems and opens new vistas for the construction of highly efficient and magnetically separable photocatalysts.

Valence- and Conduction-Band Offsets for Atomic-Layer-Deposited Al2O3 on (010) (Al0.14Ga0.86)2O3

The wide-bandgap ternary (AlxGa1−x)2O3 forms a heterostructure system with Ga2O3 that is attracting attention for modulation-doped field-effect transistors. The options for gate dielectric on (AlxGa1−x)2O3 are limited by the need for adequate band offsets at the heterointerface. Al2O3 deposited by atomic layer deposition (ALD) is one option due to its large bandgap (6.9 eV). We measured the valence-band offset at the Al2O3/(Al0.14Ga0.86)2O3 heterointerface using x-ray photoelectron spectroscopy (XPS). Al2O3 was deposited by ALD onto single-crystal β-(Al0.14Ga0.86)2O3 (bandgap 5.0 eV) grown by molecular beam epitaxy (MBE). The valence-band offset was determined to be 0.23 ± 0.04 eV (straddling gap, type I alignment) for ALD Al2O3 on β-(Al0.14Ga0.86)2O3. The conduction-band offset was 1.67 ± 0.30 eV, providing good electron confinement.

MoSx@NiO Composite Nanostructures: An Advanced Nonprecious Catalyst for Hydrogen Evolution Reaction in Alkaline Media

AbstractThe design of the earth‐abundant, nonprecious, efficient, and stable electrocatalysts for efficient hydrogen evolution reaction (HER) in alkaline media is a hot research topic in the field of renewable energies. A heterostructured system composed of MoSx deposited on NiO nanostructures (MoSx@NiO) as a robust catalyst for water splitting is proposed here. NiO nanosponges are applied as cocatalyst for MoS2 in alkaline media. Both NiO and MoS2@NiO composites are prepared by a hydrothermal method. The NiO nanostructures exhibit sponge‐like morphology and are completely covered by the sheet‐like MoS2. The NiO and MoS2 exhibit cubic and hexagonal phases, respectively. In the MoSx@NiO composite, the HER experiment in 1 m KOH electrolyte results in a low overpotential (406 mV) to produce 10 mA cm−2 current density. The Tafel slope for that case is 43 mV per decade, which is the lowest ever achieved for MoS2‐based electrocatalyst in alkaline media. The catalyst is highly stable for at least 13 h, with no decrease in the current density. This simple, cost‐effective, and environmentally friendly methodology can pave the way for exploitation of MoSx@NiO composite catalysts not only for water splitting, but also for other applications such as lithium ion batteries, and fuel cells.

Direct observation of an electrically degenerate interface layer in a GaN/sapphire heterostructure.

An electrically degenerate layer deteriorates the optoelectric performance of a wide band gap semiconductor grown on an insulator substrate. This detrimental effect can be passively avoided by using a buffer layer to harbor various lattice defects. However, the longstanding scientific questions regarding the microscopic origin of the degenerate interface layer and the effect of local changes in the atomic structure and chemical environment at an interface on the functionality of a desired film have remained unanswered. Moreover, this is key information for the development of ultrathin optoelectronic devices. In this study, we discuss the direct observation of a degenerate interface phase at the GaN/sapphire interface on an atomic scale. By combining high-resolution transmission electron microscopy and electron energy loss spectroscopy, we detect the presence of an ultrathin (∼6.5 Å) α-Ga2O3-x layer near the GaN/sapphire interface, which is subjected to ∼4.5% biaxial compressive strain and contains many oxygen vacancies. Density functional theory calculations show that the presence of a defective α-Ga2O3-x thin layer in the GaN and sapphire heterostructure remarkably reduces the band offset between the α-Ga2O3-x conduction band and the GaN valence band, thereby exerting a significant influence on the conductivity enhancement of the interface. Our results provide an unprecedented integrated picture of the degenerate interface phenomenon on an atomic scale, which would evolve the fundamental understanding about a wide band gap semiconductor heterostructure system.

Stable CuCrO2 nanoparticles - ZnO fibres p-n heterostructure system for effective photocatalytic activity

Heterostructured photocatalysts were fabricated by coupling electrospun n-type ZnO fibres and hydrothermally derived p-type CuCrO2 nanoparticles. The effect of the amount of CuCrO2 nanoparticles on the photocatalytic activity of the heterostructured photocatalyst was systematically investigated. The formation of the heterojunctions between the two semiconductors was revealed via detailed XRD, XPS, TEM and optical property measurements. The experimental results indicated that the optimal CuCrO2 amount in the composite photocatalyst was 1.0wt.% due to the optimum doping and surface coverage, higher absorption onset edge, larger absorption intensity and optimum band gap energy. This composite photocatalyst, fabricated by drop casting of CuCrO2 nanoparticle dispersion on ZnO fibres, displayed 30% higher rate constant (k) value compared to the pure ZnO fibres in the degradation of methylene blue dye molecules and reached 93.4% decomposition in 1 h under UV-visible light exposure. The obtained results are highly encouraging in comparison to only UV/light active p-n heterostructured photocatalysts previously reported in literature. Therefore, we believe that the proposed approach here opened the way for simple synthesis of highly-efficient visible light active heterostructured semiconductor photocatalyst systems.

Synergetic Behavior in 2D Layered Material/Complex Oxide Heterostructures.

The marriage between a 2D layered material (2DLM) and a complex transition metal oxide (TMO) results in a variety of physical and chemical phenomena that cannot be achieved in either material alone. Interesting recent discoveries in systems such as graphene/SrTiO3 , graphene/LaAlO3 /SrTiO3 , graphene/ferroelectric oxide, MoS2 /SrTiO3 , and FeSe/SrTiO3 heterostructures include voltage scaling in field-effect transistors, charge state coupling across an interface, quantum conductance probing of the electrochemical activity, novel memory functions based on charge traps, and greatly enhanced superconductivity. In this context, various properties and functionalities appearing in numerous different 2DLM/TMO heterostructure systems are reviewed. The results imply that the multidimensional heterostructure approach based on the disparate material systems leads to an entirely new platform for the study of condensed matter physics and materials science. The heterostructures are also highly relevant technologically as each constituent material is a promising candidate for next-generation optoelectronic devices.

Layer k -projection and unfolding electronic bands at interfaces

The k-projection method provides an approach to separate the contributions from different constituents in heterostructure systems and can act as an aid to connect the results of experiments and calculations. We show that the technique can be used to "unfold" the calculated electronic bands of interfaces and supercells, and provide local band structure by integrating the projected states over specified regions of space, a step that can be implemented efficiently using fast Fourier transforms. We apply the method to investigate the effects of interfaces in heterostructures consisting of a graphene bilayer on H-saturated SiC(0001), BAs monolayer on the ferromagnetic semiconductor CrI3, silicene on Ag(111), and to the Bi2Se3 surface. Our results reveal that the band structure of the graphene bilayer around the Dirac point is strongly dependent on the termination of SiC(0001): on the C face, the graphene is n doped and a gap of ~0.13 eV is opened, whereas, on the Si face, the graphene is essentially unchanged and neutral. We show that for BAs/CrI3, the magnetic proximity effect can effectively induce a spin splitting up to about 50 meV in BAs. For silicene/Ag(111), our calculations reproduce the angle-resolved photoemission spectroscopy results, including linearly dispersing bands at the edge of the first Brillouin zone of Ag(111); although these states result from the interaction between the silicene overlayer and the substrate, we demonstrate that they are not Dirac states.

Exploration of CeO2-CuO Quantum Dots in Situ Grown on Graphene under Hypha Assistance for Highly Efficient Solar-Driven Hydrogen Production.

The development of an artificial model of photoinduced hydrogen production system requires efficient, long-term stability and cost-competitive photocatalysts to store solar energy in chemical bonds. However, the existing photocatalysts still suffer from the high cost, high recombination rate of photoexcited electron-hole pairs, and poor photostability. Herein, we demonstrate the synthesis of a p-type CuO/n-type CeO2 heterojunction in situ grown on graphene via a hypha assistance process. Amazingly, optical and photoelectrochemical measurements show the superiority of this hierarchically biomorphic structure. The observed H2 evolution rate of the CeO2-CuO quantum dots/graphene has reached 2481 μmol·h-1·g-1 and remains unchanged in four hydrogen production cycles. Considering the convenience of microbial culture, this heterostructure system has great potential as a photocatalyst for solar-fuel conversion.

TiO2-Au-Cu2O Photocathodes: Au-Mediated Z-Scheme Charge Transfer for Efficient Solar-Driven Photoelectrochemical Reduction

An Au-mediated Cu2O-based Z-scheme heterostructure system is demonstrated for use as efficient photocathodes in photoelectrochemical (PEC) reduction. The samples are prepared by electrodepositing a...

A new insight into the enhanced visible light-induced photocatalytic activity of NaNbO3/Bi2WO6 type-II heterostructure photocatalysts

In this study, a series novel NaNbO3/Bi2WO6 heterojunction composites with a type-II alignment were fabricated via a facile wet impregnation method. The as-prepared photocatalysts were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), diffuse reflectance UV-Vis spectroscopy (DRS), photocurrent (PC) and electrochemical impedance spectroscopy (EIS) analyses. The 30 wt% NaNbO3/Bi2WO6 composite exhibited the best performance in the case of degrading rhodamine B (RhB) aqueous solution under visible light irradiation (λ > 410 nm), which was ∼2.5 times and ∼40 times that of pure Bi2WO6 and NaNbO3, respectively. The improved photocatalytic performance was further demonstrated by 2-chlorophenol under the same reaction conditions. This may be attributed to the enhanced electron-hole separation efficiency in Bi2WO6 with the assistance of NaNbO3, as well as the dye-sensitization effect of RhB dye itself. Intermediates produced during the reaction and RhB degradation pathway were investigated as well. Radical quenching experiments revealed h+ played the predominant role; O2·- functioned as well to some degree. Based on experimental results, the potential functioning mechanism was proposed, which is different from previously reported type-II heterostructure systems when Bi2WO6 works as the electron reservoir and O2·- is one of the dominant active species. The as-prepared photocatalyst composite exhibited excellent stability after repetitively running five times. Effects of several operating parameters on the catalyst performance including initial RhB concentration, catalyst dosage, reaction temperature and initial pH were also discussed. This study provides solid evidence for NaNbO3 to be a promising candidate for photocatalysis and gives out a novel photocatalytic mechanism of Bi2WO6-based heterostructures.

Photovoltaic effect in cuprate superconductor (Bi, Pb)2Sr2Ca2Cu3O10+δ and Bi2Sr2CaCu2O8+δ under magnetic field

Photovoltaic effects of Bi-2223/Ag and Bi-2212/Ag heterostructures under magnetic fields up to ± 9 T induced by continuous purple-laser irradiation have been investigated in a wide temperature range between 10 K and 350 K. There is a broad peak in the temperature dependence of Voc for the Bi-2223/Ag system near 45 K which can be ascribed to the minority phase of Bi-2212 within the Bi-2223 sample. The anomalous magnetic field dependence of Voc below 60 K suggests that the low temperature magnetic behavior of Voc for the Bi-2223/Ag system is greatly affected by the minority phase Bi-2212. No polarity reversal of Voc was observed at the superconducting transition of Bi-2212/Ag heterostructure, consisting with that for SmO0.7F0.3FeAs/Ag system but opposite to that of Bi-2223/Ag and YBCO/Ag systems. This observation indicates that the majority charge carriers in this heavily over-doped Bi-2212 are electrons other than holes. Our results show that the photo-induced voltage has a photovoltaic nature closely related to the built-in electric field of the intrinsic metal/superconductor interface. The magnitude and the direction of the built-in electric field can be changed by applying an external magnetic field and/or varying the laser intensity. Our data provide a new dimension of information for depicting a more comprehensive picture of metal/HTSC heterostructure system and may lead to new applications of high temperature superconductor in the field of photo-electronic and magnetic sensing devices.

Construction of MIL-53(Fe) metal-organic framework modified by silver phosphate nanoparticles as a novel Z-scheme photocatalyst: Visible-light photocatalytic performance and mechanism investigation

Novel heterostructure photocatalysts consisted of MIL-53(Fe) and silver phosphate (Ag3PO4) were successfully developed through a simple in situ precipitation strategy in this work. The photocatalytic activities of the as-synthesized samples were assessed via multiple antibiotics degradation, including tetracycline (TC), oxytetracycline (OTC), chlortetracycline (CTC) and deoxytetracycline (DCL). All the obtained Ag3PO4/MIL-53(Fe) composites exhibited much more superior photocatalytic activities than pure MIL-53(Fe) and Ag3PO4. Especially, the optimal composite with 1:3 mass ratio of Ag3PO4:MIL-53(Fe) (APM-3) displayed the best photocatalytic activity, for which the removal of antibiotics was 93.72% (TC), 90.12% (OTC), 85.54% (CTC) and 91.74% (DCL) under visible light irradiation for 1 h. The APM-3 also exhibited good photostability and recyclability. Three-dimensional (3D) EEMs (excitation-emission matrix fluorescence spectroscopy) was applied to further investigate the TC degradation process, and the TC intermediates were identified by high-performance liquid-mass spectrometry (HPLC-MS). The possible degradation pathway for TC was also discussed. In addition, electron spin resonance (ESR) measurement and quenching experiments verified that O2−, OH and h+ radicals all worked during the degradation process. In the end, a possible Z-scheme heterostructure model composed of MIL-53(Fe), metallic Ag and Ag3PO4 was proposed, in which the small reducible Ag nanoparticles functioned as a center for charge transmission. Powerful redox ability and effective separation of photoinduced carriers can be achieved in this Z-scheme heterostructure system. The findings of this work could offer a novel way to design MOF-based materials for remediation of contaminated water.

Energy bandgap engineering of graphene nanoribbon by doping phosphorous impurities to create nano-heterostructures: A DFT study

Energy bandgap engineering is used to produce semiconductor heterostructure systems that perform processes such as the resonant tunneling in nanoelectronics and the solar energy conversion in solar cell applications. However, the performance of such systems degrades as their size is reduced. Graphene-based nanoelectronics has appeared as a candidate to enable high performance down to the single-molecule scale. Here, graphene nanoribbons (GNRs) can have bandgaps that are tunable by using chemical doping method. We have been predicted that bandgap engineering within a GNR may be achieved by varying the number and geometrical pattern of phosphorus (P) impurities in the GNS, so that we have carried out first-principles calculations of the energetic and electronic properties of P-doped GNR based on density functional theory (DFT) with Gaussian 09W packages. The geometric and electronic properties of the GNR with and without various dopants of phosphorus impurities were performed and discussed. Our results show that the electronic properties of GNR do not only depend on the phosphorus impurity concentrations, but also depend on the geometrical pattern of phosphorus impurities in the GNR. As a result, we can bandgap engineering of GNR by doping phosphorous impurities to create semiconductor heterostructure, which can be used in many important applications.

Nondegenerate Chiral Phonons in Graphene/Hexagonal Boron Nitride Heterostructure from First-Principles Calculations.

Triggered by the recent successful observation of previously predicted phonon chirality in the monolayer tungsten diselenide [ Science 2018 , 359 , 579 ], we systematically study the chiral phonons in the classical heterostructure of graphene/hexagonal boron nitride (G/ h-BN) by first-principles calculations. It is found that the broken inversion symmetry and the interlayer interaction of G/ h-BN not only open the phononic gaps but also lift the degeneracy of left-handed and right-handed chiral phonons at the first-Brillouin-zone corners (valleys). At valleys, the hybridization makes chiral phonon modes solely contributed from one individual layer. Moreover, we demonstrate that the vertical stress is effective to tune the degenerated phononic gap while keeping the valley-phonon chirality of G/ h-BN heterostructure, which is favorable for the Raman or ultrafast infrared spectroscopy measurement. We also analyze the pseudoangular momentum of valley-phonon modes, which provide important references for the excitation and measurement of the chiral phonons in the process of electronic intervalley scattering. Collectively, our results on the chiral phonons in the G/ h-BN heterostructure system could stimulate more experimental and theoretical studies and promote the future applications on the phonon-chirality-based phononics.