Rational design of Au/Co3O4-functionalized W18O49 hollow heterostructures with high sensitivity and ultralow limit for triethylamine detection

Zhang

Part & Part Syst Charact

et al. 2021

photodynamic therapy (PDT) are using light-sensitive nanomaterials to effectively treat cancer patients with non-invasive and low side effects. [5][6][7] However, studies have shown that monotherapy owns obvious limitations, so it is important to build a synergistic anti-tumor system for the effective ablation of cancer cells. [8,9] The attraction of PTT is growing due to its advantages of precise targeting, minimization of damage and noninvasive treatment. [9] PTT utilizes photosensitizer absorption and transformation of near-infrared light (NIR) into heat to achieve the therapeutic effect of thermal ablation of cancer cells. [10] With the development of PTT, an increasing number of photothermal nanomaterials have been discovered. [2] Due to its strong absorption of near-infrared region, W 18 O 49 attracts extensive research on photothermal therapy. [11][12][13][14] In the previous report, Chen's group studied the ablation of cancer cells at 980 nm (0.72 W cm −2, 3.0 g•L −1 ) driven by PEGylated W 18 O 49 nanowires with high photothermal conversion efficiency, and the maximum temperature change could reach 29 °C after 5 min of illumination. [15] However, W 18 O 49 as a single photosensitizer for PTT cannot achieve our expected goal of combined anti-tumor. The research showed that C-based photothermal nanomaterials were widely studied. [16,17] It is not only cheaper than noble metal nanomaterials (including Au, Ag, Pt, and Pd), more stable than organic nanomaterials, but also has the characteristics of easy preparation, modification, and high biocompatibility. Miao's group studied the use of carbon spheres for photothermal anti-tumor and the study showed that the photothermal conversion efficiency of carbon spheres could reach 35.1% at 808 nm (2W, 3 mL, 0.2 mg mL −1 ) for 10 min, and it had a good ability of tumor clearance. [18] These demonstrate the excellent optical properties and high biocompatibility of W 18 O 49 and C nanomaterials for their potential in biomedical applications.Although the reports of Chen's group and Miao's group are of great significance for the ablation of cancer cells, only construction of a synergistic anti-tumor system can achieve satisfactory experimental results to make effective use of near-infrared light and solve the problem of poor dispersion and uncontrollable morphology of monoclinic crystal W 18 O 49 . Inspired by previous reports, [19,20] we constructed the W 18 O 49 In this study, a chemotherapy-photothermal synergistic anti-tumor system is constructed. Both W 18 O 49 @R-C and PEG-W 18 O 49 @R-C synthesized by hydrothermal method show the potential of photothermal therapy (PTT). The structure of reflux-carbon is bubble-like spherical and W 18 O 49 @R-C obtained by hydrothermal synthesis will cause bubble collapse due to the formation of crystal W 18 O 49 ; thus, the particle size decreases sharply. Furthermore, the photothermal stability of PEG-W 18 O 49 @R-C is higher than that of W 18 O 49 @R-C, and ζ-potential measurement indicates that PEG-W 18 O 49 @R-C has excellent d...

Section: Resultsmentioning

confidence: 99%

PEG Modificated Bubble‐Like Carbon Spherical‐W₁₈O₄₉ Using for In Vitro Chemotherapy‐Photothermal Synergistic Reverse Cancer Cells

Zhang

Part & Part Syst Charact

et al. 2021

“…In parallel to diverse nanostructures, composite materials without any structural modifications were also utilized in TEA and TMA sensors. [346][347][348][349][350][351]. Herein, ZnO/ZnFe 2 O 4 composite displayed a good sensitivity to TEA under irradiation (R a /R g ≥ 9 for 500 ppm at 80 • C) and requires additional interrogations to enhance the response [346].…”

Section: Various Nanostructures In Volatile Organic Amines Detectionmentioning

confidence: 93%

“…In parallel to diverse nanostructures, composite materials without any structural modifications were also utilized in TEA and TMA sensors. Materials such as ZnO/ZnFe 2 O 4 composites, Au/Co 3 O 4 /W 18 O 49 hollow composite nanospheres, α-Fe 2 O 3 @α-MoO 3 composite, CuO/ZnO 3D diamond shaped MOF, rGO decorated W-doped BiVO 4 hierarchical nanocomposite, and Au@MoS 2 nanocomposite were effectively consumed in TEA or TMA detection [ 346 , 347 , 348 , 349 , 350 , 351 ]. Herein, ZnO/ZnFe 2 O 4 composite displayed a good sensitivity to TEA under irradiation (R a /R g ≥ 9 for 500 ppm at 80 °C) and requires additional interrogations to enhance the response [ 346 ].…”

Section: Various Nanostructures In Volatile Organic Amines Detectimentioning

confidence: 99%

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

Shellaiah

Sun

2021

Sensors

Environmental pollution related to volatile organic compounds (VOCs) has become a global issue which attracts intensive work towards their controlling and monitoring. To this direction various regulations and research towards VOCs detection have been laid down and conducted by many countries. Distinct devices are proposed to monitor the VOCs pollution. Among them, chemiresistor devices comprised of inorganic-semiconducting materials with diverse nanostructures are most attractive because they are cost-effective and eco-friendly. These diverse nanostructured materials-based devices are usually made up of nanoparticles, nanowires/rods, nanocrystals, nanotubes, nanocages, nanocubes, nanocomposites, etc. They can be employed in monitoring the VOCs present in the reliable sources. This review outlines the device-based VOC detection using diverse semiconducting-nanostructured materials and covers more than 340 references that have been published since 2016.

“…On account of the catalytic and spillover effect of noble metal, many researchers improved the sensing performance of SMOs sensors by designing a ternary hollow heterojunction with the addition of noble metal. [ 70–75 ] Generally, noble metals, such as Pd and Au, are usually doped in the heterojunction hollow semiconductors to exert a spillover effect. Xu et al.…”

Section: Gas Sensors Based On Closed Hollow Heterojunctionmentioning

confidence: 99%

“…designed a novel heterostructure of Au/Co 3 O 4 /W 18 O 49 hollow spheres for triethylamine detection. [ 70 ] As a result of a large inner cavity and highly porous shell ( Figure a–d), W 18 O 49 hollow spheres are nominated as core materials to support Co 3 O 4 and Au anchoring on the surface. By comparing the gas sensing performance of pristine W 18 O 49 , Co 3 O 4 /W 18 O 49, and Au/Co 3 O 4 /W 18 O 49 , Au/Co 3 O 4 /W 18 O 49 display a very high response (16.7) to 2 ppm triethylamine and a low limit of detection (81 ppb), as shown in Figure 8e.…”

Section: Gas Sensors Based On Closed Hollow Heterojunctionmentioning

confidence: 99%

Chemiresistive Gas Sensors Based on Hollow Heterojunction: A Review

Liu

Xiao

2021

Adv Materials Inter

Chemiresistive gas sensors are widely used in tens of thousands of applications, from health and safety to energy efficiency and emission control. Fabrication of highly effective sensing materials is of great significance for the practical applications in efficient gas detection. Among numerous sensing materials, semiconductor‐based sensing materials with hollow and heterojunction structures demonstrate distinct advantages such as high sensitivity, low operating temperature, and fast response/recovery. In this paper, the mechanism of gas sensing by chemiresistive sensors, as well as the mechanisms responsible for enhanced sensing performance in hollow structure and heterojunction are reviewed. Both single‐shelled and multi‐shelled hollow heterojunction materials applied in gas detection are presented. Then, the design and application of open hollow heterojunction in gas sensing are discussed. This review provides a deeper understanding of innovative works on the material design of high‐performance sensing materials for gas detection. It also summarizes the key technical challenges in material development and points out the perspectives for future studies on the next generating of chemiresistive gas sensing materials.