Article
Materials Science, Ceramics
Tingting Xiong, Yin Ye, Bin Luo, Liping Shen, Dongmei Wang, Meikun Fan, Zhengjun Gong
Summary: The 3D TA-TiO2-GA with network architectures and in situ growth of TiO2 NPs showed excellent photocatalytic performance and reusability in degrading organic contaminants. Mechanistic studies revealed the important roles of adsorption and photocatalysis, with superoxide radical anions and hydroxyl radicals as major reactive oxidative species. This study provides a novel alternative for solar light-driven environmental applications.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Alejandra Romero-Moran, Jose L. Sanchez-Salas, Joel Molina-Reyes
Summary: The study established the influence of the crystalline phase and agglomeration degree of TiO2 nanoparticles on photocatalytic hydroxyl radical formation and bacterial inactivation in TiO2/SiO2 composite coatings. A relationship between hydroxyl radicals' formation and charge carrier transfer mechanism between defect levels in SiO2 and TiO2 embedded nanoparticles was established through a simple spectroscopic method. This correlation complements the lack of mechanisms behind the photocatalytic activity in TiO2/SiO2 composites.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Analytical
Xinwei Chen, Tao Wang, Yutong Han, Wen Lv, Bolong Li, Chen Su, Min Zeng, Jianhua Yang, Nantao Hu, Yanjie Su, Zhi Yang
Summary: This study presents a convenient watch-type wearable NO2 sensor with low power consumption and stable mechanical durability, allowing for real-time monitoring and early warning of toxic gases through wireless bluetooth transmission. The impressive sensing performance of ZnS NPs/N-rGO is attributed to geometrical and electronic effects, which is significant for the future development of low-power, high-performance sensing equipment.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Environmental
Aleksandra Pollap, Jaros law Serafin, Isabel Serrano, Joanna Srenscek-Nazzal, Jordi Llorca
Summary: In this work, novel Pt-Cu-TiO2 composites modified with rGO were developed as promising photocatalysts for the generation of hydrogen. The partial replacement of platinum with copper lowered the cost of hydrogen photoproduction while maintaining high efficiency. The additional modification with rGO successfully boosted the amount of generated H2.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Sohel Das, Vineeta Singh, Subhankar Paul
Summary: A conjugate of nano-graphene oxide (GO) and titanium dioxide nanoparticle (nTiO(2)) was proposed for the photocatalytic degradation of toxic azo dyes. The optimized weight ratio of 1:5 between GO and nTiO(2) showed the highest degradation efficiency. The nanoconjugate exhibited high degradation efficiency for Congo red (CR) and Methylene blue (MB), and the photocatalyst could be reused for multiple cycles.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Apisit Karawek, Kittipad Kittipoom, Labhassiree Tansuthepverawongse, Nutkamol Kitjanukit, Wannisa Neamsung, Napat Lertthanaphol, Prowpatchara Chanthara, Sakhon Ratchahat, Poomiwat Phadungbut, Pattaraporn Kim-Lohsoontorn, Sira Srinives
Summary: Photoreduction of carbon dioxide (CO2) to high-value products using a photocatalyst is an effective technique for dealing with CO2 emissions. In this research, TiO2 nanosheets were synthesized using a hydrothermal technique and further composited with graphene oxide and copper oxide to create CTNSG, which exhibited outstanding photoactivity in converting CO2 gas to methane and acetone.
Article
Materials Science, Multidisciplinary
Hyunjun Park, Woong Kim, Sang Won Lee, Joohyung Park, Gyudo Lee, Dae Sung Yoon, Wonseok Lee, Jinsung Park
Summary: A flexible and disposable paper-based NO2 sensor based on a reduced graphene oxide/chitosan (rGO/CS) composite is proposed in this study. By analyzing the conductive change of the composite, nitrogen dioxide can be detected in a concentration range of 0-100 ppm, demonstrating its practical application potential.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Martina Milani, Michele Mazzanti, Stefano Caramori, Graziano Di Carmine, Giuliana Magnacca, Alessandra Molinari
Summary: A series of composite CdS/TiO2 powders were synthesized by nucleating TiO2 on CdS nanoseeds. This composite exhibited the appropriate band edge position for photocatalytic redox reactions: visible light irradiation of CdS facilitated electron injection into TiO2, thereby extending charge lifetimes. The obtained electrons were utilized for the efficient photoreduction of 4-nitrobenzaldehyde to 4-aminobenzaldehyde, as confirmed by H-1 NMR and ESI-MS positive ion mode. Simultaneously, sacrificial oxidation of 2-propanol occurred, serving as the proton source. Characterization techniques highlighted the crucial factors driving the photocatalytic reaction, including the nanoscale anatase crystalline domains, the presence of dispersed CdS forming an extended active junction CdS/anatase, and the presence of mesopores as nanoreactors. This system not only exhibited high photocatalytic activity using visible light but also demonstrated improved stability and recyclability due to the combination of TiO2 and CdS.
Review
Energy & Fuels
Xin Zhou, Xian Zhang, Yuemei Wang, Zhen Wu
Summary: Research on semiconductor photocatalysts, particularly titanium dioxide (TiO2), for addressing global water shortages and pollution has garnered significant attention. Combining graphene with TiO2 has shown promise in creating an effective catalyst under visible light. The review covers characteristics of different composites, preparation methods, synthesis effects, reaction mechanisms, and pollutant degradation in water.
FRONTIERS IN ENERGY RESEARCH
(2021)
Review
Materials Science, Ceramics
Chenyang Wang, Yanyan Wang, Zhi Yang, Nantao Hu
Summary: Graphene is considered a promising gas sensing material due to its high specific surface area and good conductivity. Recent studies have shown that graphene-based gas sensors doped with metals, polymers, and metal oxides exhibit good sensitivity, selectivity, and repeatability. Possible improvement methods and common problems characteristic of graphene-based gas sensors are discussed in this review.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Environmental
Xin Hong Tai, Chin Wei Lai, Thomas Chung Kuang Yang, Chia-Yun Chen, Abdul Halim Abdullah, Kian Mun Lee, Joon Ching Juan
Summary: Indoor air pollutants, particularly volatile organic compounds (VOCs), have been found to have adverse health effects and have gained significant attention. A metal-free photocatalyst, boron-doped photoreduced graphene oxide (BPRGO), was successfully synthesized using a cost-effective UV irradiation method. This photocatalyst demonstrated high efficiency in degrading VOCs under UV-A irradiation, removing 80% of methanol within 6 hours. Additionally, up to 91% of the VOCs were mineralized into harmless CO2. The high photoactivity of BPRGO-1.0 was attributed to the presence of oxygenated boron groups (OBGs) and the right amount of boron dopants, which increased the hole carrier density and p-type conductivity, reducing charge carrier recombination and improving the photocatalytic removal of VOCs.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
S. Kiranmai, Charan Kuchi, Bathinapalta Sravani, Teresa Luczak, Myung Jong Kim, G. Madhavi, Y. Veera Manohara Reddy
Summary: A facile sensing platform using titanium dioxide-reduced graphene oxide nanofibers was developed for the accurate detection of epinephrine in biological fluids and pharmaceutical drugs.
SURFACES AND INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Kun Jiang, Jin Zhang, Yingfei Wan, Zengjian Liu, Jinwei Chen
Summary: A new strategy of aminating titanium dioxide and combining it with reduced graphene oxide was proposed for the preparation of an advanced photocatalyst with high efficiency in removing gaseous formaldehyde. The optimal catalyst demonstrated significantly improved catalytic activity and recyclability in formaldehyde photolysis compared to commercial TiO2. The enhanced performance was attributed to the formation of imine by chemisorption of amino and formaldehyde, as well as the introduction of graphene to enhance carrier separation efficiency. This strategy offers a useful method for highly efficient formaldehyde photocatalysis.
Article
Nanoscience & Nanotechnology
Sunil Kumar, Veronika A. Dmitrieva, Gang Meng, Stanislav A. Evlashin, Ekaterina V. Sukhanova, Dmitry G. Kvashnin, Zakhar I. Popov, Alexander G. Bannov, Fedor S. Fedorov, Albert G. Nasibulin
Summary: We improved the sensitivity of NO2 analyte by adjusting the width ratio of adjacent graphene oxide (GO) and reduced graphene oxide (rGO) layers using GO laser reduction technique. The reduction of GO led to a chemiresistive response to NO2, and an optimum GO/rGO width ratio achieved a chemiresistive response of 18.1% towards 100 ppm of NO2 with a limit of detection of 230 ppb. The enhanced chemiresistive response of GO/rGO sensors to NO2 physisorption was attributed to increased sorption energy and improved charge transfer at the GO/rGO interface area compared to fully reduced GO.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Qiuhua Yuan, Yuan Yang, Wenshan Wu, Xiaoyi Dai, Junxi Zhong, Youliang Jian, Ruilong Li, Tao Wang, Hong Yu, Xianyou Xia
Summary: In this study, a novel ternary composite material was prepared by combining titanium dioxide (TiO2) with hydroxyapatite (HA) and reduced graphene oxide (RGO). Methylene blue (MB) was used as the target pollutant to evaluate the photocatalytic activity of TiO2/HA/RGO. The results showed that the introduction of HA and RGO effectively enhanced the catalytic performance of TiO2. The ternary composite exhibited excellent dye removal effect, with a removal rate of 99.8% for MB under 120 minutes of simulated sunlight, which was 2 times that of TiO2/HA and 7 times that of TiO2. The improved photocatalytic activity of the ternary composite was mainly attributed to the synergistic effect between TiO2, HA, and RGO. This work provides a new idea for the synthesis of practical photocatalysts.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Correction
Chemistry, Physical
Jaehwan Ko, Do Hyun Cho, Dong-Joo Kim, Young Soo Yoon
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Vahid Mirkhani, Shiqiang Wang, Kosala Yapabandara, Muhammad Shehzad Sultan, Min Prasad Khanal, Sunil Uprety, Burcu Ozden, Ehsan Hassani, Benjamin Schoenek, Dong-Joo Kim, Tae-Sik Oh, Ayayi Claude Ahyi, Sarit Dhar, Michael C. Hamilton, Mobbassar Hassan Sk, Minseo Park
Summary: Solution-based bottom-gate zinc oxide thin film transistors were fabricated and remained functional and stable under extreme gamma irradiation conditions. The removal of the channel surface due to the cumulative effect of displacement damage near the ZnO surface was observed through thickness measurements and optical images. The impact of displacement damage on the device characteristics was discussed in terms of surface/bulk effects.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Naresh Shahi, Eunji Lee, Byungjin Min, Dong-Joo Kim
Summary: Cellulose and its derivatives have been explored as potential gas sensing materials due to their renewability, versatility, and biocompatibility. In this study, cellulose nanofibers and TEMPO-oxidized cellulose nanofibers extracted from rice husks were fabricated into highly sensitive gas sensing films. The results demonstrated that these nanocellulose-based sensors exhibit good sensitivity for detecting water-soluble gases under ambient conditions.
Article
Engineering, Chemical
Jung Min Kim, Yuyang Wang, Yi-hung Lin, Jaesik Yoon, Tina Huang, Dong-Joo Kim, Maria L. Auad, Bryan S. Beckingham
Summary: The study focuses on the preparation of cross-linked ion exchange membranes with high mechanical toughness for direct fuel cells, using different monomers and a cross-linker. The experimental results demonstrate that these membranes exhibit superior performance compared to commercial membranes.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Electrochemistry
Jaesik Yoon, Myeongseok Sim, Tae-Sik Oh, Young Soo Yoon, Dong-Joo Kim
Summary: A sensitive and selective sweat sensor based on a flexible NiCu(OOH)/polystyrene (PS) electrode was reported for detecting a urea biomarker. The sensor exhibited excellent linear response and sensitivity, with negligible interferences from co-existing species. Bending tests demonstrated excellent mechanical tolerance, highlighting its potential for biomedical applications.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Young Soo Yoon, Padmini Basumatary, Mehmet Emin Kilic, Yoo Lim Cha, Kwang-Ryeol Lee, Dong-Joo Kim, Dimpul Konwar
Summary: A novel nanosized GaPtMnP alloy anchored on N-doped multiwall carbon nanotubes was developed as an efficient electrocatalyst for ethanol fuel cells, exhibiting high activity and stability. It delivered mass and specific activities approximately 13- and 8-fold higher than Pt/C, with long-term stability and durability even after 3000 cycles. The fuel cell based on this catalyst showed a peak power density approximately fourfold higher than Pt/C, maintaining constant performance after multiple startup-shutdown cycles.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Polymer Science
Gautam Das, Ji-Hyeok Choi, Phan Khanh Thinh Nguyen, Dong-Joo Kim, Young Soo Yoon
Summary: The fuel cell industry is highly promising for developing clean and sustainable energy generation. While significant progress has been made in proton exchange membrane fuel cells (PEMFCs), technical limitations and high costs remain. Anion exchange membrane fuel cells (AEMFCs) have emerged as a low-cost alternative, with numerous studies investigating their potential to overcome the challenges faced by PEMFCs.
Article
Nanoscience & Nanotechnology
Changhyeon Yoo, Jaesik Yoon, Md Golam Kaium, Brandon Osorto, Sang Sub Han, Jung Han Kim, Bo Kyoung Kim, Hee-Suk Chung, Dong-Joo Kim, Yeonwoong Jung
Summary: In this study, vertically aligned 2D MoS2 layers integrated on cellulose nanofibers were explored for detecting volatile organic compound gases. The sensor devices showed excellent sensitivity and biodegradability, offering significant opportunities for mechanically reconfigurable sensor technologies.
Article
Chemistry, Multidisciplinary
Yoo Lim Cha, Jeong-Hye Jo, Dong-Joo Kim, Sun Hee Kim
Summary: A colloidal Sn-doped In2O3 (ITO) ink with silver (Ag) introduced was prepared for transparent conductive electrodes. By controlling the weight ratio of ITO and Ag nanoparticles, the ITO@Ag colloid ink was fabricated, showing a flattened and smooth surface due to the metallic silver filling the gap between the nano-particles. The inclusion of silver significantly reduced the resistivity and the films exhibited good optical transparency.
Article
Nanoscience & Nanotechnology
Guodong Wu, Haishun Du, Doohee Lee, Yoo Lim Cha, Wonhyeong Kim, Xinyu Zhang, Dong-Joo Kim
Summary: The flexible resistive-type polyaniline-based gas sensor fabricated by dip-coating graphene and in situ polymerization of aniline demonstrates fast response and recovery times, ppb-level detection limit, and excellent sensing capability, suitable for breath analysis and kidney disease diagnosis.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Analytical
Guodong Wu, Haishun Du, Yoo Lim Cha, Doohee Lee, Wonhyeong Kim, Farshad Feyzbar-Khalkhali-Nejad, Tae-Sik Oh, Xinyu Zhang, Dong-Joo Kim
Summary: In this study, a gas sensor was developed using disposable surgical masks as a flexible substrate. The sensor exhibited fast response and recovery times, low detection limit, high response value, and good stability. The sensing performance was attributed to the network structure of the sensor with a higher specific surface area and conductive channels. Additionally, the sensor could detect breathing patterns in real-time for noninvasive monitoring.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Multidisciplinary
Wonhyeong Kim, Doohee Lee, Guodong Wu, Yoo Lim Cha, Md. Shakir Moazzem, Sungeun Cho, Dong-Joo Kim
Summary: This work presents a molecularly imprinted gas sensor for monitoring the condition of naturally ripened strawberries. The sensor utilizes a molecularly imprinted polymer (MIP)-based polyaniline (PANI) to selectively detect furaneol gas, a biomarker associated with strawberry flavor. The sensor showed sensitivity and selectivity at room temperature and under different humidity conditions. The developed MIP-chemiresistive sensor offers a potential platform for rapid and cost-effective recognition of furaneol in real strawberries.
Article
Engineering, Environmental
Guodong Wu, Haishun Du, Kiandokht Pakravan, Wonhyeong Kim, Yoo Lim Cha, Shang-Tung Chiang, Majid Beidaghi, Xinyu Zhang, Sun Hee Kim, Xuejun Pan, Dong-Joo Kim
Summary: Flexible gas sensors were fabricated using disposable masks as substrates, exhibiting wide detection range, reliable reproducibility, long-term stability, and excellent response towards CO2 gas. The enhanced sensing performance of the composite sensor can be attributed to the heterojunctions between Ti3C2Tx and PANI, improved conductivity, and enlarged specific surface area. A wearable device was also developed for respiratory disease diagnosis.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Hyeongwoo Min, Ji-Hyeok Choi, Ha Eun Kang, Dong-Joo Kim, Young Soo Yoon
Summary: A Pt-based catalyst with excellent durability and high activity is designed in this study, which reduces the direct contact between carbon and the fuel cell environment by introducing a modified metal oxide layer. This helps prevent carbon corrosion and inhibits the separation, aggregation, and growth of Pt nanoparticles. Moreover, the catalyst exhibits enhanced oxygen reduction activity due to the electronic effect of the metal oxide layer that is coated on it. The results of the study demonstrate the superior catalytic properties of the developed catalyst during a load-cycling experiment consisting of 5,000 cycles.
