Decoration Of Ag Nanoparticles Research Articles

Low-Dark Current UV Photodetector Based on Photochemical Reduction Ag-Nanoparticles Decoration ZnO Nanostructure

Low-Dark Current UV Photodetector Based on Photochemical Reduction Ag-Nanoparticles Decoration ZnO Nanostructure

Highly efficient SnO2-Carbon nanosphere heterojunctions decorated with Ag for detecting isopropanol at low operating temperatures

The design of a sensing material for detecting isopropanol gas with low operating temperature is extremely important for miniaturization and wearability of gas sensors. Herein, a novel gas sensor based on SnO2-Carbon nanosphere heterojunctions decorated with Ag nanoparticles (SCA) was fabricated and its gas sensing performance was evaluated and compared systematically. The measurement results indicated that the sensing performance was influenced by the ratio of Sn/C and the length of Ag plating, and the SCA sensor provided the best response. For 100 ppm isopropanol at 100 °C, the SCA sensor exhibited a response value of 50.51, a response time of 7 s and a recovery time of 60 s. The enhanced sensing performance and reduced operating temperature of the SCA could be attributed to the synergistic effect of the SnO2-Carbon nanosphere heterojunctions and the significant catalytic performance of the decorated Ag nanoparticles. In addition, the density functional theory calculation method based on the first-principles theory was used to study the adsorption performance and electronic behavior, as well asthe influence of Ag decoration on SnO2 for isopropanol detection. The calculated results were consistent with the experimental results.

Enhancement of n-butanol sensing performance of porous ZnO flakes by decorating Ag nanoparticles

This study designs to investigate a high-performance n-butanol gas sensor with a porous morphology. Porous ZnO flakes modified with Ag particles are prepared in two steps using hydrothermal and precipitation methods. Morphological analysis of the samples shows that the ZnO flakes were covered with mesopores with high porosity, and their edge lengths ranged from 3 μm to 6 μm, with a minimum thickness of 11.3 nm. Through rigorous gas sensing testing, we find that the optimal mass percentage Ag-ZnO sensor provided significantly better sensing behavior, with a 100.8 response for 100 ppm n-butanol, compared to 14.5 for the pure ZnO sensor, a 5.95-fold improvement. In addition, the sensor's optimal operating temperature is reduced from 290 °C to 190 °C, increasing its adaptability and versatility in practical applications. In subsequent tests, it is found that this Ag-ZnO sensor not only shows excellent selectivity to n-butanol but also favorable stability, with no significant degradation during 30 days of continuous testing. The experimental analysis shows that the formation of porous flake structure and the modification of Ag particles are effective approaches to improve the ZnO gas sensor.

Monitoring of clinical drug osimertinib based on red phosphorus@silver composite SERS substrate synthesized by a photo-induced in-situ reduction method

Surface enhanced Raman scattering (SERS) with high detection sensitivity has emerged as a fascinating protocol for monitoring trace amount of drugs in clinical serum sample. Herein, a simple and environmentally friendly photo-induced in-situ reduction strategy was proposed to synthesize RP@Ag composites with both SERS and photocatalytic activities. By carefully adjusting the concentration of the Ag source in the precursor solution, the amount and diameter of the decorated Ag nanoparticles were precisely tuned. The resulting optimal RP@Ag composites exhibited reliable SERS enhancement ability (enhancement factor: 1.76 × 107) and the highest degradation efficiency (degradation ratio: 95.04 %, irradiation time: 120 mins) in recyclable detection of Rhodamine B. After further confirming the reliable accuracy, sensitivity, homogeneity, and durability of the RP@Ag composites, they were used to monitor osimertinib and enabled an extremely low limit of detection as 1.63 × 10−7 mg/mL. In particular, such a recyclable SERS platform achieved perfect recovery rates, the obtained deviations were all within 10 % in the monitoring of clinical samples from patients taking medicine for different durations.

A strategy to reutilize silver nanoparticles on silicon nanowires via photocathodic activation for enhanced and sustainable hydrogen evolution

The development of electrodes for hydrogen evolution via water splitting in a neutral electrolyte is highly desirable, especially considering that natural water resources such as seawater typically have a neutral pH. In this study, silicon nanowires (SiNWs) arrays with uniform silver (Ag) decoration are prepared as a cathode material, which exhibits excellent and stable electrochemical performance for neutral water electrolysis. Ag ions, utilized in the preparation of SiNWs through metal-assisted chemical etching technique, are retained and decorated within the SiNWs array without undergoing a dissolution process, referred to as Native SiNWs. Remained Ag+ ions on the SiNWs are activated photocathodically and reduced to Ag0, resulting in a significantly enhanced performance as an electrocatalyst for hydrogen evolution reaction (HER). Hence, this photocathodic activation of Native SiNWs (PCA-Native SiNWs) eliminates the need for additional cocatalyst deposition for HER, utilizing the Ag ions employed in the SiNWs preparation process. This enhancement in HER activity is exclusively observed by photocathodic activation, not by cathodic activation without light irradiation, indicating the crucial role of photoelectrons in SiNWs under light irradiation for the activation. Additionally, the nanowire structure serves as an ideal platform for Ag nanoparticles, providing sufficient surface area, resulting in excellent dispersion and an increased number of active sites. Furthermore, PCA-Native SiNWs demonstrates outstanding electrochemical stability for over 60 h, with no significant reduction in current density or structural degradation in a neutral electrolyte. Several characterizations and electrochemical analyses have been conducted to elucidate the in-situ decoration of Ag nanoparticles on SiNWs and investigate the surface chemistry for the activation mechanism. This work introduces a new perspective on using Ag-decorated SiNWs directly as an electrocatalyst for effective hydrogen evolution in a neutral media.

Dual conductive network enables mechanically robust polymer composites with highly electrical and thermal conductivities

Thermally and electrically conductive polymer composites (CPCs) have been widely used in smart and flexible electronics; however, huge challenges remain in simultaneously improving the electrical and thermal conductivity of CPCs while maintaining the satisfactory mechanical properties including sufficient strength and toughness. In this study, we propose an effective interfacial regulation approach to fabricate CPCs with a dual conductive network through decoration of Ag nanoparticles (AgNPs) onto the polyurethane (PU) nanofibers containing graphite nanoplatelets (GNPs), followed by hot-pressing. Rigid GNPs expand the PU nanofiber network, facilitating Ag precursor adsorption, while subsequent hot-pressing eliminates the big channels and pores inside nanofiber composite membranes and hence greatly enhance their mechanical properties. After hot-pressing, the synergistic dual conductive network with greatly reduced thermal and electrical contact resistance leads to significant improvements in both thermal and electrical conductivity (up to 27.71 W (m K)−1 and 1.87 × 106 S/m, respectively). Moreover, the mechanically robust CPCs with exceptional durability possess superior Joule heating performance at low voltages and heat dissipation capability. This study provides inspiration for designing highly thermally and electrically conductive CPCs with potential applications as flexible thermal interface materials.

NiAl LDH nanosheets based on Ag nanoparticles-decoration and alkali etching strategies for high performance supercapacitors

Layered double hydroxides (LDHs) represent a category of two-dimensional layered intercalation materials, showing significant potential as electrode materials for the production of high-energy-density supercapacitors due to their tunable composition, ease of synthetic modification, and low cost. Here, we constructed alkali-etched NiAl LDH-OH nanosheets/Ag nanoparticles (NPs) composite material (Ag@NiAl LDH-OH) for high-performance supercapacitors through a simple solvent-thermal reaction. The alkali treatment is employed to selectively etch some Al3+ ions, generating cation vacancies as active sites for energy storage. Additionally, under the simultaneous influence of strong alkalis and vacancies, the interlayer spacing of LDHs expands, aiding in the promotion of interlayer ion mobility. Meanwhile, the decoration of silver nanoparticles ensures excellent electron conductivity in the NiAl-LDH-OH nanosheets, thereby facilitating improved utilization of the active substance and achieving outstanding rate performance. The Ag@NiAl LDH-OH electrode, when prepared, demonstrates a significant increase in specific capacitance, reaching 1790 F g−1 at a current density of 1 A g−1. This represents approximately 7 times the specific capacitance of the pristine NiAl LDH electrode, with a capacity retention of 79 % even under a high current density of 20 A g−1. Moreover, the assembled asymmetric supercapacitor (ASC) attains a maximum energy density of 138.25 Wh kg−1 at a power density of 700 W kg−1, maintaining 81 % of its initial specific capacitance after 20000 cycles. This research introduces novel pathways for advancing high-energy-density SCs.

Surface modification of the laser powder bed-fused Ti-Zr-Nb scaffolds by dynamic chemical etching and Ag nanoparticles decoration

Metallic lattice scaffolds are designed to mimic the architecture and mechanical properties of bone tissue and their surface compatibility is of primary importance. This study presents a novel surface modification protocol for metallic lattice scaffolds printed from a superelastic Ti-Zr-Nb alloy. This protocol consists of dynamic chemical etching (DCE) followed by silver nanoparticles (AgNP) decoration. DCE, using an 1HF + 3HNO3 + 12H2O23% based solution, was used to remove partially-fused particles from the surfaces of different as-built lattice structures (rhombic dodecahedron, sheet gyroid, and Voronoi polyhedra). Subsequently, an antibacterial coating was synthesized on the surface of the scaffolds by a controlled (20 min at a fixed volume flowrate of 500 mL/min) pumping of the functionalization solutions (NaBH4 (2 mg/mL) and AgNO3 (1 mg/mL)) through the porous structures. Following these treatments, the scaffolds' surfaces were found to be densely populated with Ag nanoparticles and their agglomerates, and manifested an excellent antibacterial effect (Ag ion release rate of 4–8 ppm) suppressing the growth of both E. coli and B. subtilis bacteria up to 99 %. The scaffold extracts showed no cytotoxicity and did not affect cell proliferation, indicating their safety for subsequent use as implants. A cytocompatibility assessment using MG-63 spheroids demonstrated good attachment, spreading, and active migration of cells on the scaffold surface (over 96 % of living cells), confirming their biotolerance. These findings suggest the promise of this surface modification approach for developing superelastic Ti-Zr-Nb scaffolds with superior antibacterial properties and biocompatibility, making them highly suitable for bone implant applications.

Fabrication of silver nanoparticles decorated on sodium alginate microbeads enriched with keratin and investigation of its catalytic and antioxidant activity

In this study, an environmentally friendly, effective, easily synthesizable and recoverable nano-sized catalyst system (Ag@NaAlg-keratin) was designed by decorating Ag nanoparticles on microbeads containing sodium alginate (NaAlg) and keratin obtained from goose feathers. The structure, morphology and crystallinity of the Ag@NaAlg-keratin nanocatalyst were evaluated by XRD, FT-IR, FE-SEM, EDS/EDS mapping and TEM analyses. Catalytic ability of designed Ag@NaAlg-keratin nanocatalyst was then investigated against 4-nitrophenol (4-NP) and methyl orange (MO) reductions. Ag@NaAlg-keratin nanocatalyst effectively reduced 4-NP in 6 min and MO in 5 min, with rate constants of 0.17 min−1 and 0.16 min−1, respectively. Additionally, activation energies (Ea) were found as 39.8 kJ/mol for 4-NP and 37.9 kJ/mol for MO. Performed recyclability tests showed that the Ag@NaAlg-keratin nanocatalyst was easily recovered due to its microbead form and successfully reused five times, maintaining both its activity and structure. Furthermore, antioxidant activity of Ag@NaAlg-keratin nanocatalyst was the highest (73.16 %).

Decoration of Ag nanoparticles on CoMoO4 rods for efficient electrochemical reduction of CO2.

Hydrothermal and photoreduction/deposition methods were used to fabricate Ag nanoparticles (NPs) decorated CoMoO4 rods. Improvement of charge transfer and transportation of ions by making heterostructure was proved by cyclic voltammetry and electrochemical impedance spectroscopy measurements. Linear sweep voltammetry results revealed a fivefold enhancement of current density by fabricating heterostructure. The lowest Tafel slope (112mV/dec) for heterostructure compared with CoMoO4 (273mV/dec) suggested the improvement of electrocatalytic performance. The electrochemical CO2 reduction reaction was performed on an H-type cell. The CoMoO4 electrocatalyst possessed the Faraday efficiencies (FEs) of CO and CH4 up to 56.80% and 19.80%, respectively at - 1.3V versus RHE. In addition, Ag NPs decorated CoMoO4 electrocatalyst showed FEs for CO, CH4, and C2H6 were 35.30%, 11.40%, and 44.20%, respectively, at the same potential. It is found that CO2 reduction products shifted from CO/CH4 to C2H6 when the Ag NPs deposited on the CoMoO4 electrocatalyst. In addition, it demonstrated excellent electrocatalytic stability after a prolonged 25h amperometric test at - 1.3V versus RHE. It can be attributed to a synergistic effect between the Ag NPs and CoMoO4 rods. This study highlights the cooperation between Ag NPs on CoMoO4 components and provides new insight into the design of heterostructure as an efficient, stable catalyst towards electrocatalytic reduction of CO2 to CO, CH4, and C2H6 products.

Ag–Ru interface for highly efficient hydrazine assisted water electrolysis

Ru decorated Ag nanoparticles are designed as highly effective bifunctional electrocatalysts for hydrazine oxidation and hydrogen evolution reactions, enabling a hydrazine assisted water electrolyser with greatly increased current density.

Efficient visible-light-driven photocatalytic performance for nitrogen oxide abatement application in the air by a typical metal/semiconductor heterojunction

To improve the photocatalytic oxidation activity of SnO2 nanorods, we decorated Ag nanoparticles onto SnO2 nanorods via a photoreduction route at low temperature. The metal/semiconductor heterojunction based on Ag/SnO2 nanorods indicated a high photocatalytic activity towards NO gas removal in visible light region at the air conditions. Detailly, the NO photocatalytic removal performance of Ag/SnO2 heterojunctions are significantly enhanced, achieving 50.6 % after 30 min, approximately 1.9 times higher than that of SnO2 nanorods. In addition, the Ag/SnO2 heterojunctions have a lower NO2 gas conversion efficiency of 1.0 %, while pure SnO2 nanorods have a high NO2 conversion efficiency of 5.2 %. Moreover, photogenerated holes play a crucial role in the photocatalytic activity of NO gas removal.

High-performance flexible piezocomposites based on an enhanced interfacial polarization effect via BCZT@Ag heterostructure design

Flexible piezoelectric energy harvesters (FPEHs) can convert mechanical energy into electric energy in a manner that powers electronic equipment and systems. Structural design of piezoelectric fillers in organic–inorganic piezocomposites is means of enhancing the power generation performance of FPEHs. Herein, a design strategy of piezoelectric fillers is proposed: decorating Ag nanoparticles onto Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCZT) particles, forming a BCZT@Ag heterostructure, thus obtaining BCZT@Ag/poly(vinylidene fluoride) (PVDF) piezocomposites. An extremely high piezoelectric constant d33 of 34 pC/N is achieved in the BCZT@Ag/PVDF sample, which is 2.6 times higher than that of the BCZT/PVDF sample. The greatly improved piezoelectric properties are attributable to enhanced interfacial polarization via BCZT@Ag heterostructure design. More poling electric voltage is applied to the piezoelectric filler particles, resulting in substantially improved poling efficiency. This composite approach of introducing metal particles is a generic design method and can be extended to other organic–inorganic piezocomposite systems.

Synergistic effects of hydrothermally decorated Ag nanoparticles over rGO for antibacterial activities

Antibacterial activity of the silver decorated reduced graphene oxide (Ag-rGO) nanocomposites have been investigated against E. coli as a model for gram-negative bacteria. The effect of temperature during the hydrothermal treatment of Ag-rGO nanocomposites synthesized by simultaneous reduction of GO and AgNO3 over the antibacterial activity has been studied. The composite samples were further reduced hydrothermally at different temperatures, viz. 100 °C, 150 °C, and 200 °C for 24 h to integrate silver nanoparticles (AgNPs) into rGO. Variations in the hydrothermal treatment temperature allowed alterations in the morphology and particle size of the AgNPs. The AgNPs grown at room temperature are in bunches and smaller sizes, whereas the hydrothermally treated samples have uniformly distributed bigger AgNPs. The particle size of AgNPs on rGO grows from 45 nm at room temperature to 65 nm and 220 nm in the hydrothermally treated samples at 150 °C and 200 °C, respectively. The antibacterial activity of the Ag-rGO composite has been observed to be size dependent. The Ag-rGO composite hydrothermally treated at 150 °C, having a particle size of ∼65 nm, has been observed to have the highest activity; the zone of inhibition is 3.4 ± 2.8 cm. The Ag nanocrystallite’s edges and defects in the rGO sheets together destroy the bacterial cells in a series of stages, ultimately resulting in cell death and high antibacterial activity.

One-pot synthesis of Ag-modified SrTiO3: synergistic effect of decoration and doping for highly efficient photocatalytic NOx degradation under LED

Strontium titanate is an ideal cubic-structure perovskite oxide that finds application in hydrogen production and water pollutants degradation field. However, its photocatalytic activity is limited under UV irradiation due to its wide energy band bap (∼ 3.2 eV). To overcome this limitation, different strategies, such as metal-doping or metal-decoration, have emerged. Here, Ag-modified-SrTiO3 photocatalysts were prepared for the first time by a cheap, simple and sustainable approach based on the use of Ag-enriched wastewaters. The Ag-decorated SrTiO3 synthesized by a two steps method photodegraded by nearly 77% of NOx within 3 h. The Ag-modified SrTiO3 prepared by aone-pot synthesis led to a doubly modification of the oxide: Ag+ doping and Ag nanoparticles-decoration. In this case the use of Ag-enriched wastewaters led to poor photocatactivity of the photocatalyst, probably related to the presence of other metals in the waste. However, the use of a pure Ag precursor permitted the fabrication of a highly efficient material achieving complete photodegradation of NOx, exhibiting a photoactivity 4 times higher than bare SrTiO3 and 1.3 times more active than Ag-decorated material. The photocatalytic enhancement was attributed to the combined effect of Ag-doping and Ag-decoration on SrTiO3, which contributed to a narrow band gap (2.80 eV), as well as the formation of heterojunctions that promotes the separation of photogenerated charges, respectively. This material showed good stability during recycling tests, maintaining high performances after five cycles. Eventually, active species were identified using various scavengers by trapping holes and radicals generated during the photocatalytic degradation process.

Fabrication of novel Ag nanoparticles decorated ZrO2/g-C3N4 ternary heterojunction interface for photocatalytic reduction of nitroaromatic compounds

Photocatalytic reduction of nitroaromatic compounds to aniline is a promising and green technique. Herein, a novel and highly efficient Ag-ZrO2/g–C3N4 ternary heterojunction has been synthesized by decorating Ag nanoparticles (NPs) on ZrO2/g–C3N4 via ultrasonication method. The prepared heterostructures were characterized by XRD, UV–vis DRS, BET, STEM, EDX, XPS, Raman, and PL spectroscopic techniques. The photocatalytic efficiency of Ag-ZrO2/g–C3N4 was evaluated by the reduction of nitrobenzene (NB) to aniline (AN) under visible light without reducing agent. The structure and photocatalytic performance of Ag-ZrO2/g–C3N4 was compared with Ag-ZrO2, ZrO2, and g–C3N4. Among the as-prepared photocatalysts, Ag-ZrO2/g–C3N4 has demonstrated the highest photocatalytic efficiency, with 100% reduction of NB to AN in 8 min under visible light. The excellent photocatalytic reduction efficiency of Ag-ZrO2/g–C3N4 can be ascribed to the formation of a good interface between Ag, ZrO2 and g-C3N4. The as-prepared Ag-ZrO2/g–C3N4 exhibited good stability during numerous reaction cycles. As a result, the photocatalyst presents a reliable and efficient solution for reducing nitroaromatic compounds, which can be highly useful in industry and contribute to creating a healthier and more environmentally friendly atmosphere.

Ultrasmall Ag nanoparticles on photoactive metal-organic framework boosting aerobic cross-dehydrogenative coupling under visible light

The application of heterogeneous photocatalyst to conduct organic transformation is attractive in sustainable chemistry. Metal-organic frameworks (MOFs) are crystalline materials with diverse structures and rich components, which exhibit great potential to achieve heterogeneous photocatalysis. Herein, we report the synthesis of new photocatalysts of MOF-based nanocomposites to achieve cross-dehydrogenation coupling (CDC). A series of nanocomposites of Ag/MOF were prepared by simple photoreduction method. The resulting nanocomposites exhibit efficient and recyclable photocatalytic performance for CDC reactions under visible light. Experiments show that the photocatalytic activity of the MOF was promoted significantly upon the decoration of ultrasmall Ag nanoparticles (NPs), where the particle size and loading amount of Ag NPs play an important role to improve the photocatalytic performance. Ultrasmall Ag NPs not only boost the photoinduced charge generation by Schottky junction in the nanocomposite, but also promote the reaction by direct interaction with amine substrate. Reactive oxygen species (ROS) of singlet oxygen and superoxide radical were simultaneously generated from molecular oxygen in the photocatalytic reaction, owing to the photoinduced energy and electron transfer of the MOF. The study presents a rare example of photocatalytic CDC using MOF-based nanocomposite, providing more insights into the synergy effect of MOFs and metal nanoparticles for organic transformation.

A Laser-Printed Surface-Enhanced Photoluminescence Sensor for the Sub-Nanomolar Optical Detection of Mercury in Water

Here, we report a novel, easy-to-implement scalable single-step procedure for the fabrication of a solid-state surface-enhanced photoluminescence (SEPL) sensor via the direct femtosecond (fs) laser patterning of monocrystalline Si wafers placed under the layer of functionalizing solution simultaneously containing a metal salt precursor (AgNO3) and a photoluminescent probe (d114). Such laser processing creates periodically modulated micro- and nanostructures decorated with Ag nanoparticles on the Si surface, which effectively adsorbs and retains the photoluminescent sensor layer. The SEPL effect stimulated by the micro- and nanostructures formed on the Si surface localizing pump radiation within the near-surface layer and surface plasmons supported by the decorating Ag nanoparticles is responsible for the intense optical sensory response modulated by a small amount of analyte species. The produced SEPL sensor operating within a fluidic device was found to detect sub-nanomolar concentrations of Hg2+ in water which is two orders of magnitude lower compared to this molecular probe sensitivity in solution. The fabrication technique is upscalable, inexpensive, and flexible regarding the ability to the control surface nano-morphology, the amount and type of loading noble-metal nanoparticles, as well as the type of molecular probe. This opens up pathways for the on-demand development of various multi-functional chemosensing platforms with expanded functionality.

Facile Synthesis of ZnO/Ag Nanostructure with Enhanced Photocatalytic Activity

AbstractA series of x%Ag/ZnO (x: 0; 1; 2; 5; 10) nanostructures were successfully synthesized through the facile method. The material's structures were confirmed through X‐ray diffraction, while their morphology, elemental distribution, and components were analyzed using cross‐sectional transmission electron microscopy (XTEM), Field‐emission scanning electron microscopy (FESEM). The optical properties of Ag/ZnO revealed a decrease in band gap from 3.2 eV to 2.83 eV and a significant reduction in photoluminescence intensity with increasing Ag nanoparticle loading on the surface of ZnO. The photocatalytic activity of synthesized Ag/ZnO flower‐like nanostructure was evaluated in the photodegradation of methylene blue (MB) under UV‐Vis irradiation. The photocatalytic results indicated that decorating Ag nanoparticles on the surface of ZnO improved the photodegradation of MB. Interestingly, the 5%Ag/ZnO showed the highest effectiveness, achieving a 99% removal efficiency of MB for 60 minutes under UV‐Vis irradiation. Notably, the ultra performance liquid chromatography‐ tandem mass spectroscopy (UPLC‐MS/MS) confirmed the structure of intermediates, while total organic carbon (TOC) removal was 47%. Moreover, the proposed mechanism for the charge transfer process was based on the results of radical scavenging experiments, which showed that superoxide was the dominant reactive species. Finally, the 5%Ag/ZnO was stable and reused at least five times.

Facile synthesis of large-scale TiO2 nanorod arrays decorated with Ag nanoparticles as sensitive 3D SERS substrates

A facile and green synthesis strategy is employed to prepare uniform three-dimensional (3D) nanostructure as surface-enhanced Raman scattering (SERS) sensors by decorating Ag nanoparticles (AgNPs) on TiO2 nanorod arrays. The results of XPS, SEM and TEM analyses indicate that AgNPs are distributed homogeneously on the surface of TiO2 nanorods. The 3D hybrid substrate presents sensitive SERS signals of rhodamine 6 G (R6G). The relative standard deviation (RSD) for the main Raman vibration modes (611, 776, 1189 and 1651 cm−1) is less than 7%. Further UV–vis absorption spectra and FDTD simulation jointly illustrate that the interaction between AgNPs with symmetrical distribution in three dimensions generated intensive hot spots, which greatly improved the performance and spatial uniformity of SERS. The substrate also exhibits excellent SERS ability in detecting adenine molecule. The results show that the two-steps synthesis is a promising strategy for preparing 3D hybrid nanostructure substrate for SERS.