Synthesis of low-cost 3D-porous ZnO/Ag SERS-active substrate with ultrasensitive and repeatable detectability

Yang, Maosen; Yu, Jing; Lei, Fengcai; Zhou, Hang; Wei, Yisheng; Man, Baoyuan; Zhang, Chao; Li, Chonghui; Ren, Junfeng; Yuan, Xiaobo

doi:10.1016/j.snb.2017.09.197

Cited by 56 publications

(20 citation statements)

References 34 publications

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“…Further completing this 3D heterostructure, 10 µL of the presynthesis dispersion of Ag NPs was dropped on the surface of these CuO NWs, and then the droplet dried under ambient temperature (25 °C). Ag NPs with mean diameter ≈75 nm (size distributions are shown as Figure S1b in the Supporting Information) were chosen in this paper, because Ag NPs at this size have both better far‐field and near‐field effects . According to the absorption spectrum of Ag NPs (Figure S1a 2 , Supporting Information), the LSPR peak is located at 476 nm, and the crest around 400–550 nm implies that there is a broad absorption region for them.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to the EM based substrates, bases with particular structures, e.g., the 3D SERS‐active bases, have also become more and more highlighted recently . There are two major advantages for the 3D structure, one is the bigger specific surface area, and the other is the light‐trapping effect . Among them, the latter one can lead to the multiple reflections for incident lights in Raman base and finally improves the lights utilization .…”

Section: Introductionmentioning

confidence: 99%

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Capillarity‐Assistant Assembly: A Fast Preparation of 3D Pomegranate‐Like Ag Nanoparticle Clusters on CuO Nanowires and Its Applications in SERS

Yang

Zhang

et al. 2018

Adv Materials Inter

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Essentially, the "hot spot" is the intensive local electric field originating from the localized surface plasmon resonance (LSPR) of metal nanoparticles (NPs), and thus designing a special metal configuration to obtain the stronger electric-field enhancement naturally becomes a major reference in preparing SERS-active substrates. [1,2] Recently, many reports have demonstrated that the electric fields in the nanogaps between adjacent metal NPs can interact with each other, which are much stronger in contrast with that around the isolated NP. [4][5][6][7][8][9] Generally, metal nanoparticle clusters (NPCs) not only have abundant nano-interspaces which could provide various "hot spots," but also are equipped with bigger specific surface area, implying more probe molecules will be adsorbed on their surfaces, and thus are very popular in Raman enhancement. [1,7,10,11] Nowadays, except for the metal NPCs, semiconductor/metal heterostructures, such as Au/ZnO; Ag/TiO 2 ; etc., have also been regarded as one of the effective ways in tuning the LSPR due to the charge transfer (CT) effect between their interface. [12][13][14][15] Owing to the redistribution of electrons during the CT process, many analogous electric dipoles will form nearby the semiconductor/metal interface, which have been proved can contribute well to electric field enhancement, in other words are very useful in improving the EM as well. [12,16] In addition to the EM based substrates, bases with particular structures, e.g., the 3D SERS-active bases, have also become more and more highlighted recently. [13,[17][18][19][20] There are two major advantages for the 3D structure, one is the bigger specific surface area, and the other is the light-trapping effect. [18,21] Among them, the latter one can lead to the multiple reflections for incident lights in Raman base and finally improves the lights utilization. [20,22] One thing needs to be aware of is that besides the ultrasensitive detectability, a high-quality SERSactive substrate should also be equipped with many factors such as good stability, outstanding repeatability, well durability, economic-simple preparation process, and so on. [21,23] Therefore, designing a truly useful SERS-active substrate, a deceptively simple question, still faces enormous challenges today.Considering all the factors mentioned above, in this paper, a 3D Ag NPCs/CuO nanowires (NWs) heterostructure is designed A 3D pomegranate-like "Ag nanoparticle clusters/CuO nanowires" heterostructure is designed and prepared by a fast two-step method with assistance of capillarity in this paper. Owing to the abundant "hot spots" generated in the gaps of Ag nanoparticle clusters and the improved electromagnetic mechanism caused by the charge transfer effect between Ag/CuO interface, this heterostructure shows outstanding Raman performance with the enhancement factor as high as 3.30 × 10 9 . Both the formation process and the Raman enhancement mechanism of this heterostructure are meticulously analyzed, and the finite-different time-domain and f...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capillarity‐Assistant Assembly: A Fast Preparation of 3D Pomegranate‐Like Ag Nanoparticle Clusters on CuO Nanowires and Its Applications in SERS

Yang

Zhang

et al. 2018

Adv Materials Inter

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“…Moreover, they permit the emergence of hotspots placed at the level of the interface of the metal and semiconductor. Furthermore, another possible outcome is based on the zinc oxide (ZnO) nanostructures capped with metallic layer or metallic nanoparticles in order to achieve excellent enhancement factors (EF = 10 6 –10 10 ) [ 53 , 54 , 55 , 56 ]. The use of bimetallic nanosystems offers the possibility to have excellent functionalities concerning the plasmonic and chemical properties compared to plasmonic nanosystems composed of an unique metal [ 57 , 58 ].…”

Section: Introductionmentioning

confidence: 99%

Latest Novelties on Plasmonic and Non-Plasmonic Nanomaterials for SERS Sensing

Barbillon

2020

Nanomaterials

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An explosion in the production of substrates for surface enhanced Raman scattering (SERS) has occurred using novel designs of plasmonic nanostructures (e.g., nanoparticle self-assembly), new plasmonic materials such as bimetallic nanomaterials (e.g., Au/Ag) and hybrid nanomaterials (e.g., metal/semiconductor), and new non-plasmonic nanomaterials. The novel plasmonic nanomaterials can enable a better charge transfer or a better confinement of the electric field inducing a SERS enhancement by adjusting, for instance, the size, shape, spatial organization, nanoparticle self-assembly, and nature of nanomaterials. The new non-plasmonic nanomaterials can favor a better charge transfer caused by atom defects, thus inducing a SERS enhancement. In last two years (2019–2020), great insights in the fields of design of plasmonic nanosystems based on the nanoparticle self-assembly and new plasmonic and non-plasmonic nanomaterials were realized. This mini-review is focused on the nanoparticle self-assembly, bimetallic nanoparticles, nanomaterials based on metal-zinc oxide, and other nanomaterials based on metal oxides and metal oxide-metal for SERS sensing.

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“…3D nanostructure template and coinage metal nanoparticles, as an emerging ideal substrate, have attracted extensive research attention due to excellent SERS performance compared with 2D substrates because it can offer not only a large number of dense hot spots in the focus volume but also large available surface area for target molecule adsorption. Accordingly, extensive efforts have been devoted to the optimal design and construction of 3D structures to promote the performance of SERS, and numerous accompanying technologies have been used . However, most of the fabrication strategies, such as electron beam lithography , site‐specific electrochemical deposition , and nanoimprint lithography , have been used to produce 3D SERS substrates, but they suffer from low throughput, limited feature size and are time consuming.…”

Section: Introductionmentioning

confidence: 99%

“…Lately, another fabrication method for 3D SERS substrate was realized by deposition of noble metal nanoparticles on the nanostructured template, e.g. PAN‐Nanohump array films , hierarchical electrohydrodynamic structures , anodic aluminum oxide substrate , 3D MoS 2 nanostructures , biomimetic substrates , carbon‐fenced conductive silver nanowires , sunflower‐like nanoarrays , and ZnO nanostructure arrays . These 3D SERS substrates present multi‐scale roughness, including that generated by the structured templates as well as the metal deposition‐generated roughness, creating plasmonic features with fine tunability.…”

Section: Introductionmentioning

confidence: 99%

3D aluminum/silver hierarchical nanostructure with large areas of dense hot spots for surface‐enhanced raman scattering

Zhao

Xie

et al. 2019

Electrophoresis

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Plasmonic nanomaterials possessing large‐volume, high‐density hot spots with high field enhancement are highly desirable for ultrasensitive surface‐enhanced Raman scattering (SERS) sensing. However, many as‐prepared plasmonic nanomaterials are limited in available dense hot spots and in sample size, which greatly hinder their wide applications in SERS devices. Here, we develop a two‐step physical deposition protocol and successfully fabricate 3D hierarchical nanostructures with highly dense hot spots across a large scale (6 × 6 cm2). The nanopatterned aluminum film was first prepared by thermal evaporation process, which can provide 3D quasi‐periodic cloud‐like nanostructure arrays suitable for noble metal deposition; then a large number of silver nanoparticles with controllable shape and size were decorated onto the alumina layer surfaces by laser molecular beam epitaxy, which can realize large‐area accessible dense hot spots. The optimized 3D‐structured SERS substrate exhibits high‐quality detection performance with excellent reproducibility (13.1 and 17.1%), whose LOD of rhodamine 6G molecules was 10−9 M. Furthermore, the as‐prepared 3D aluminum/silver SERS substrate was applied in detection of melamine with the concentration down to 10−7 M and direct detection of melamine in infant formula solution with the concentration as low 10 mg/L. Such method to realize large‐area hierarchical nanostructures can greatly simplify the fabrication procedure for 3D SERS platforms, and should be of technological significance in mass production of SERS‐based sensors.

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Synthesis of low-cost 3D-porous ZnO/Ag SERS-active substrate with ultrasensitive and repeatable detectability

Cited by 56 publications

References 34 publications

Capillarity‐Assistant Assembly: A Fast Preparation of 3D Pomegranate‐Like Ag Nanoparticle Clusters on CuO Nanowires and Its Applications in SERS

Capillarity‐Assistant Assembly: A Fast Preparation of 3D Pomegranate‐Like Ag Nanoparticle Clusters on CuO Nanowires and Its Applications in SERS

Latest Novelties on Plasmonic and Non-Plasmonic Nanomaterials for SERS Sensing

3D aluminum/silver hierarchical nanostructure with large areas of dense hot spots for surface‐enhanced raman scattering

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