Nanostructure silver-doped zinc oxide films coating on glass prepared by sol–gel and photochemical deposition process: Application for removal of mercaptan

Mohammad Hossein Habibi,Reza Sheibani 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1

Silver-doped zinc oxide (SDZO) films have been grown on glass substrate by a novel combination of sol–gel and photochemical deposition processes (SGPD). The effect of sintering on structural, electrical and optical properties was investigated. The films were characterized by UV–vis absorption spectroscopy (UV–vis), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The result of X-ray photoelectron spectroscopy (XPS) revealed that the binding energy of Ag 3d5/2 for SDZO shifts remarkably to the lower binding energy compared to the pure metallic Ag due to the interaction between silver and zinc oxide. The XRD spectra of the SDZO films indicate that silver was incorporated in the hexagonal crystal structure of zinc oxide. SEM micrographs show the uniform distribution of spherical grains of about 73 nm grain size for the pure zinc oxide thin films. The results indicated that silver doping photochemical deposition was a feasible method to tune the optical properties of zinc oxide nanostructures. SDZO films coated on glass were applied for the photodegradation of mercaptan in water. SDZO films were applied for degradation of mercaptobenzoxazole which reduced the mercaptan concentration to more than 98%.

New Routes to the Preparation of Silver-Doped Sol-Gel Films for a SERS Study

Kang, Jae-Soo,Lee, Chul-Jae,Kim, Mak-Soon,Lee, Mu-Sang Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.11

New methods were developed to prepare silver-doped sol-gel films for surface-enhanced Raman spectroscopy (SERS) applications. First, silver ions were doped into a sol-gel matrix. The doped silver ions were reduced into corresponding silver metal particles by two reductive procedures; chemical reduction and thermal reduction. The SERS spectra of benzoic acid were used to demonstrate the SERS effect of the new substrates. The adsorption strength of benzoic acid adsorbed on differently reduced substrates was discussed. The possible adsorption form and the orientation of adsorbate were also discussed.

Development of visible light sensitive titania photocatalysts by combined nitrogen and silver doping

Ibrahim El Saliby,손호경,Laszlo Erdei,김종호 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.2

In this study we present the effects of non-metal (nitrogen) and metal/non-metal (silver/nitrogen)dopants on titanium dioxide (TiO2) in synthesising visible-light reactive photocatalysts. Nanopowders of TiO2-N and TiO2-N–Ag were synthesised using a simple procedure at room temperature. For nitrogen doping, a dispersion of Degussa P-25 was treated with ammonium hydroxide. The obtained modified catalyst was further treated with silver nitrate powder to facilitate silver-nitrogen co-doping. The produced catalysts were characterised using X-ray diffraction, X-ray photoelectron spectroscopy, and specific surface area measurements. Scanning electron microscopy/energy dispersive X-ray and transmission electron microscopy were adapted to detect changes in the morphology and in the chemical composition of synthesised catalysts. The results show that both the morphology and appearance of catalysts were modified to yield nanopowders of yellowish color and relatively high specific surface area. Methylene blue (MB) dye was used as a model aquatic contaminant in 23 mg/L concentration to study the performance of these novel photocatalysts in an aerobic mixed batch reactor system under white light irradiation. Both nitrogen and nitrogen-silver co-doping lead to visible light sensitivity and the new catalysts showed remarkable activities in the decolorisation of MB.

Development of visible light sensitive titania photocatalysts by combined nitrogen and silver doping

Saliby, I.E.,Erdei, L.,Shon, H.K.,Kim, J.H. Korean Society of Industrial and Engineering Chemi 2011 Journal of industrial and engineering chemistry Vol.17 No.2

In this study we present the effects of non-metal (nitrogen) and metal/non-metal (silver/nitrogen) dopants on titanium dioxide (TiO<SUB>2</SUB>) in synthesising visible-light reactive photocatalysts. Nanopowders of TiO<SUB>2</SUB>-N and TiO<SUB>2</SUB>-N-Ag were synthesised using a simple procedure at room temperature. For nitrogen doping, a dispersion of Degussa P-25 was treated with ammonium hydroxide. The obtained modified catalyst was further treated with silver nitrate powder to facilitate silver-nitrogen co-doping. The produced catalysts were characterised using X-ray diffraction, X-ray photoelectron spectroscopy, and specific surface area measurements. Scanning electron microscopy/energy dispersive X-ray and transmission electron microscopy were adapted to detect changes in the morphology and in the chemical composition of synthesised catalysts. The results show that both the morphology and appearance of catalysts were modified to yield nanopowders of yellowish color and relatively high specific surface area. Methylene blue (MB) dye was used as a model aquatic contaminant in 23mg/L concentration to study the performance of these novel photocatalysts in an aerobic mixed batch reactor system under white light irradiation. Both nitrogen and nitrogen-silver co-doping lead to visible light sensitivity and the new catalysts showed remarkable activities in the decolorisation of MB.

Effect of Water-soluble Binders on the Synthesis of Silver-modified Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ Solid Electrolytes

Luhur Muhammad Sadewo Panghudi(루흐르 무하마드 사데오 팡후디),Geum-ji Jang(장금지),Kwang-Sun Ryu(류광선) 한국전지학회 2022 한국전지학회지 Vol.2 No.1

NASICON계 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ (LATP) 산화물계 고체전해질은 양호한 기계적 물성, 높은 Li<SUP>+</SUP> 이동수, 우수한 전기화학적 및 열적 안정성을 나타낸다. LATP의 이온전도도를 높이기 위해 수용성 바인더를 도입하였다. 은은 개질된 고체 방법을 사용하여 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ 고체 전해질에 성공적으로 치환되었다. Pristine Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ 도 치환 전 후를 비교하기 위해 합성되었다. X-ray 회절 패턴은 바인더의 첨가 후 피크의 이동을 보였으며 이는 전해질에 대한 바인더의 영향으로 나타났다. 은으로 개질된 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃에서 넓고 증가된 피크가 발견되었다. 또한 46.5° 부근에서 작은 새로운 피크가 나타났는데, 이는 LATP에 은이 성공적으로 치환되었음을 나타낸다. 이온전도도 측정은 EIS (Electrochemical Impedance Spectroscopy)로 수행되었으며 고체 전해질 용 바인더로서 1% PVA가 사용된 Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃가 4.65 × 10<SUP>-5</SUP> S/cm의 가장 높은 값을 나타낸다. NASICON-type Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ (LATP) oxide-based solid electrolyte shows the favorable mechanical property, high Li+ transfer number, and excellent electrochemical and thermal stability. Water-soluble binders were introduced in order to increase the ionic conductivity of LATP. Silver was successfully substituted to the Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ solid electrolyte using a modified solid-state method for all-solid-state lithium batteries (ASSLBs). The pristine Li<SUB>1.3</SUB>Al<SUB>0.3</SUB>Ti<SUB>1.7</SUB>(PO₄)₃ was also synthesized for comparison before and after silver modification. X-ray diffraction patterns showed the peak shifting after the addition of binders were shown as the effect of binders on the electrolyte. A similar peak with slightly increased and peak broadening for silver-modified LATP appeared after the addition of silver. There are also a small new peak appeared at around 46.5° theta degree indicating that the modification of silver on LATP has successfully synthesized. The ionic conductivity measurement was conducted by Electrochemical Impedance Spectroscopy (EIS) and revealed LATP with 1% PVA is currently displaying a highest value of 4.65 × 10<SUP>-5</SUP> S/cm as binder for solid electrolytes.

Silver-doped ZnO for photocatalytic degradation of methylene blue

권다영,김종성 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.7

Removal of organic dyes from wastewater has become an important issue because of their carcinogenic and mutagenic effects. In this study, we prepared Ag-doped ZnO (Ag_ZnO) photocatalysts containing various amounts of Ag (0.05-0.5mol%) by a hydrothermal process followed by calcination at 500 oC and evaluated the photocatalytic degradation of methylene blue (MB) under sunlight irradiation. The incorporation of Ag into the ZnO lattice and the hexagonal wurtzite structure of the prepared catalysts could be confirmed by X-ray photoelectron spectroscopy and powder Xray diffraction analysis. BET analysis shows that the pore volume and pore size was increased with doping Ag into ZnO. The photocatalytic degradation of methylene blue followed a pseudo-first-order kinetics and the rate constant for dye degradation with 0.1% mol Ag was almost three-times bigger than that with bare ZnO. Our study shows that the photocatalytic activity of ZnO toward MB degradation under sunlight can be effectively enhanced by doping with Ag.

preparation of silver-doped conductive fabrics using silver carbamate and their conducting and antibacterial properties

곽완규,공명선 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.0

실리콘 레이저 소결에서 은 나노 입자의 도핑 효과에 관한 연구

백승현(Seunghyun Back),권승갑(Seung-Gab Kwon),Liyana Hazawani Biniti Zamri,강인구(Ingu Kang),강봉철(Bongchul Kang) 한국생산제조학회 2019 한국생산제조학회지 Vol.28 No.1

Silicon is used as an essential material in the electronic and energy industries owing to its high accessibility and inherent semiconducting properties. Typically, silicon devices are produced by top-down chemical etchings, such as anisotropic etching and reactive ion etching, to make micropatterns and surface textures. In addition, doping using thermal diffusion or ion implantation is also required to optimize electrical characteristics. We propose a one-step method for fabricating multi-scale silicon layer based on the concurrent interaction of doping of silver nanoparticles during laser-induced sintering of silicon nanocrystals. The silver-doped silicon patterns were characterized by a uniform distribution and the concentration of dopants was easily adjustable by controlling the relative amount of silver nanoparticles. We expect that this method will contribute to fabricating multi-scale silicon semiconductors without using complicated chemical and vacuum processes.

Highly sensitive chemiresistive H₂S gas sensor based on graphene decorated with Ag nanoparticles and charged impurities

Ovsianytskyi, Oleksandr,Nam, Yun-Sik,Tsymbalenko, Oleksandr,Lan, Phan-Thi,Moon, Myoung-Woon,Lee, Kang-Bong Elsevier 2018 Sensors and actuators. B Chemical Vol.257 No.-

<P><B>Abstract</B></P> <P>Herein, we report a highly sensitive and selective H<SUB>2</SUB>S gas sensor based on graphene decorated with Ag nanoparticles (AgNPs) and charged impurities fabricated using a simple wet chemical method. Doping on as-grown chemical vapor deposited graphene was achieved by immersion in an aqueous solution of AgNO<SUB>3</SUB>/Fe(NO<SUB>3</SUB>)<SUB>3</SUB> for 4min followed by the decoration with adsorbed AgNPs and charged impurities. The AgNPs utilized in this process were formed by the reduction of Ag<SUP>+</SUP> ions, since the Ag<SUP>+</SUP>/Ag<SUP>0</SUP> reduction potential is higher than that of Fe<SUP>3+</SUP>/Fe<SUP>0</SUP>.</P> <P>The above treatment changed the electronic properties of graphene, achieving a dramatic resistivity change in the presence of H<SUB>2</SUB>S gas by generating surface sites for its adsorption and dissociation and thus allowing real time H<SUB>2</SUB>S level monitoring at ambient temperature with an immediate response.</P> <P>Doped graphene was demonstrated to selectively and repeatedly sense H<SUB>2</SUB>S gas within six minutes, with the limit of detection being below 100ppb. The corresponding mechanism is believed to feature a charge carrier density change of graphene to adsorbate charge transfer, with the sensor surface trapping or releasing electrons upon exposure to H<SUB>2</SUB>S gas.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Chemiresistive H<SUB>2</SUB>S sensor based on Ag nanoparticles doped-graphene was fabricated. </LI> <LI> Doping was performed in aqueous AgNO<SUB>3</SUB> and Fe(NO<SUB>3</SUB>)<SUB>3</SUB> by a simple wet-chemical method. </LI> <LI> The produced graphene sensor can detect ∼100ppb of H<SUB>2</SUB>S gas within 6min. </LI> <LI> The fabricated sensor exhibits excellent selectivity towards H<SUB>2</SUB>S gas. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Novel Carrier Doping Mechanism for Transparent Conductor: Electron Donation from Embedded Ag Nanoparticles to the Oxide Matrix

Huang, Po-Shun,Qin, Fen,Xiong, Ziye,Shim, Hyun-Woo,Gao, Tongchuan,Leu, Paul,Lee, Jung-Kun American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.23

<P>A trade-off between the carrier concentration and carrier mobility is an inherent problem of traditional transparent conducting oxide (TCO) films. In this study, we demonstrate that the electron concentration of TCO films can be increased without deteriorating the carrier mobility by embedding Ag nanoparticles (NPs) into Al-doped ZnO (AZO) films. An increment of Ag NP content up to 0.7 vol % in the AZO causes the electron concentration rising to 4 × 10<SUP>20</SUP> cm<SUP>–3</SUP>. A dependence of the conductivity on temperature suggests that the energy barrier for the electron donation from Ag NPs at room temperature is similar to the Schottky barrier height at the Ag–AZO interface. In spite of an increase in the electron concentration, embedded Ag NPs do not compromise the carrier mobility at room temperature. This is evidence showing that this electron donation mechanism by Ag NPs is different from impurity doping, which produces both electrons and ionized scattering centers. Instead, an increase in the Fermi energy level of the AZO matrix partially neutralizes Al impurities, and the carrier mobility of Ag NP embedded AZO film is slightly increased. The optical transmittance of mixture films with resistivity less than 1 × 10<SUP>–3</SUP> Ω·cm still maintains above 85% in visible wavelengths. This opens a new paradigm to the design of alternative TCO composite materials which circumvent an inherent problem of the impurity doping.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2017/aamick.2017.9.issue-23/acsami.7b03871/production/images/medium/am-2017-03871m_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am7b03871'>ACS Electronic Supporting Info</A></P>