Fabrication and evaluation of BerNPs regarding the growth and development of Streptococcus mutans

• Tuyen Huu Nguyen,
• Hong Thanh Pham,
• Kieu Kim Thanh Nguyen,
• Loan Hong Ngo,
• Anh Ngoc Tuan Mai,
• Thu Hoang Anh Lam,
• Ngan Thi Kim Phan,
• Dung Tien Pham,
• Duong Thuy Hoang,
• Thuc Dong Nguyen and
• Lien Thi Xuan Truong

Beilstein J. Nanotechnol. 2025, 16, 308–315, doi:10.3762/bjnano.16.23

• analysis of BerNPs samples revealed four characteristic absorption peaks of berberine at 230, 266, 350, and 430 nm (Figure 2A). These peaks are consistent with previous studies on the characteristic absorption spectra of berberine [26][27]. According to the standard curve (Figure 2B), the pure berberine

Radiosensitizing properties of dual-functionalized carbon nanostructures loaded with temozolomide

• Radmila Milenkovska,
• Nikola Geskovski,
• Dushko Shalabalija,
• Ljubica Mihailova,
• Petre Makreski,
• Dushko Lukarski,
• Igor Stojkovski,
• Maja Simonoska Crcarevska and
• Kristina Mladenovska

Beilstein J. Nanotechnol. 2025, 16, 229–251, doi:10.3762/bjnano.16.18

Recent advances in photothermal nanomaterials for ophthalmic applications

• Jiayuan Zhuang,
• Linhui Jia,
• Chenghao Li,
• Rui Yang,
• Jiapeng Wang,
• Wen-an Wang,
• Heng Zhou and
• Xiangxia Luo

Beilstein J. Nanotechnol. 2025, 16, 195–215, doi:10.3762/bjnano.16.16

• via non-radiative relaxation, resulting in localized lattice heating [76][77]. Therefore, semiconductors with narrow bandgaps typically show broad absorption spectra and high efficiency in photon trapping. In contrast, wide-bandgap semiconductors have a more limited range of light absorption and less

Clays enhanced with niobium: potential in wastewater treatment and reuse as pigment with antibacterial activity

• Silvia Jaerger,
• Patricia Appelt,
• Mario Antônio Alves da Cunha,
• Fabián Ccahuana Ayma,
• Ricardo Schneider,
• Carla Bittencourt and
• Fauze Jacó Anaissi

Beilstein J. Nanotechnol. 2025, 16, 141–154, doi:10.3762/bjnano.16.13

• ), BEPh(b) and BEOx (c). The absorption spectra in the visible region for the samples of bentonite and their modifications with niobium oxide (a) and niobium phosphate(b). Adsorption and photocatalysis efficiency (a) and UV–vis spectra following the digital images of the MB solutions after adsorption and

Characterization of ZnO nanoparticles synthesized using probiotic Lactiplantibacillus plantarum GP258

• Prashantkumar Siddappa Chakra,
• Aishwarya Banakar,
• Shriram Narayan Puranik,
• Vishwas Kaveeshwar,
• C. R. Ravikumar and
• Devaraja Gayathri

Beilstein J. Nanotechnol. 2025, 16, 78–89, doi:10.3762/bjnano.16.8

• + cations. These findings offer information about the structure and chemical interactions within the ZnO NPs (Figure 2b). UV–vis absorption The UV–Vis absorption spectra of ZnO NPs, presented in Figure 2c, establish a distinct absorption peak at 3.16 eV, revealing the characteristic bandgap energy for ZnO

Facile synthesis of size-tunable L-carnosine-capped silver nanoparticles and their role in metal ion sensing and catalytic degradation of p-nitrophenol

• Akash Kumar,
• Ridhima Chadha,
• Abhishek Das,
• Nandita Maiti and
• Rayavarapu Raja Gopal

Beilstein J. Nanotechnol. 2024, 15, 1576–1592, doi:10.3762/bjnano.15.124

•  3a and Supporting Information File 1, Figure S1). The sequential increase in nanoparticle size confirms nanoparticle aggregation or formation of bigger particles and is consistent with the absorption spectra in Figure 2. The polydispersity index (PDI) is a dimensionless value that measures the width

• shows the absorption spectra of ʟ-car-AgNP1 mixed with various metal ions. The concentration of ʟ-car-AgNP1 was fixed in terms of optical density at 1 ± 0.2. Figure 5a shows the optical absorbance spectra of ʟ-car-AgNP1 after adding Cd2+ and Pb2+ and all other metals at a concentration of 0.5 ppm

• significant color change (yellow to brownish-yellow) in the presence of Cd2+ and Pb2+ (Figure 5c). The color and absorption spectra change can be attributed to the nanoparticles’ aggregation [31]. A slight increase in the intensity of ʟ-car-AgNPs after the addition of Cr3+ ions was also observed, possibly due

Green synthesis of carbon dot structures from Rheum Ribes and Schottky diode fabrication

• Muhammed Taha Durmus and
• Ebru Bozkurt

Beilstein J. Nanotechnol. 2024, 15, 1369–1375, doi:10.3762/bjnano.15.110

• various excitation wavelengths in the range from 300 to 400 nm. SEM image of Si/CDs/Au-based Schottky diode. (a) UV–vis absorption spectra and (b) bandgap of the CDs layer. I–V characteristics of the Si/CDs/Au-based Schottky diode. Acknowledgements We thank Assoc. Prof. Dr. Kübra Çınar Demir and Lecturer

Mn-doped ZnO nanopowders prepared by sol–gel and microwave-assisted sol–gel methods and their photocatalytic properties

• Cristina Maria Vlăduț,
• Crina Anastasescu,
• Silviu Preda,
• Oana Catalina Mocioiu,
• Simona Petrescu,
• Jeanina Pandele-Cusu,
• Dana Culita,
• Veronica Bratan,
• Ioan Balint and
• Maria Zaharescu

Beilstein J. Nanotechnol. 2024, 15, 1283–1296, doi:10.3762/bjnano.15.104

• –Halenda) model. Diffuse reflectance UV–vis spectra were recorded with a Perkin Elmer Lambda 35 spectrophotometer equipped with an integrating sphere. The analysis range was 200–1000 nm. Based on the Kubelka–Munk function, the collected reflectance data were transformed into absorption spectra. Eg was

Effect of wavelength and liquid on formation of Ag, Au, Ag/Au nanoparticles via picosecond laser ablation and SERS-based detection of DMMP

• Sree Satya Bharati Moram,
• Chandu Byram and
• Venugopal Rao Soma

Beilstein J. Nanotechnol. 2024, 15, 1054–1069, doi:10.3762/bjnano.15.86

• solution, covering a wavelength range of 300–800 nm. In Figure 1, the optical absorption spectra of (a) Ag, (b) Au, and (c) Ag/Au NP solutions are presented for both environments obtained at 1064, 532, and 355 nm wavelengths in LASiS. All absorption spectra exhibit a distinct single surface plasmon

• wavelength for larger particles, which is evident from the absorption spectra depicted. Figure 2 depicts the pictures of Ag NPs synthesized using a laser wavelength of (d) 355 nm, (e) 532 nm, and (f) 1064 nm in an aqueous NaCl solution. The average particle size is 8.4 ± 0.4 nm at 355 nm, 13.3 ± 0.5 nm at

• ablation. This phenomenon led to lower NP production at 355 nm compared to that at 532 and 1064 nm laser wavelengths, this was also reflected in the absorption spectra. Consequently, there is a tendency for NP agglomeration and chain formation, which is evident from the TEM pictures depicted in Figure 3

Green synthesis of biomass-derived carbon quantum dots for photocatalytic degradation of methylene blue

• Dalia Chávez-García,
• Mario Guzman,
• Viridiana Sanchez and
• Rubén D. Cadena-Nava

Beilstein J. Nanotechnol. 2024, 15, 755–766, doi:10.3762/bjnano.15.63

• optoelectronic characteristics of the synthesized CQDs, UV–vis absorption spectra were measured using a Thermo Scientific Evolution 220 spectrophotometer. The CQDs were dissolved in deionized water at a ratio of 1:10 (0.3 mg of CQDs per mL) and the measurements were taken in the range of 200–800 nm. A 1 cm path

Gold nanomakura: nanoarchitectonics and their photothermal response in association with carrageenan hydrogels

• Nabojit Das,
• Vikas,
• Akash Kumar,
• Sanjeev Soni and
• Raja Gopal Rayavarapu

Beilstein J. Nanotechnol. 2024, 15, 678–693, doi:10.3762/bjnano.15.56

• prepared as shown in step 1 and were used subsequently in step 2 for the preparation of AuNMs. Figure 1b shows the absorption spectra of Au seed capped with different surfactants. Absorption spectra of CTAB-AuNM, MTAB-AuNM, and DTAB-AuNM in the range of visible to NIR are shown in Figure 1c. The absorption

• LSPR peak obtained at the NIR region in the case of CTAB-, MTAB-, and DTAB-capped gold nanomakuras were 670, 650, and 630 nm, respectively. The absorption spectra exhibited at the visible/NIR region clearly indicated the descending order of the long axes (LSPR) of the nanoparticles in this manner: CTAB

• indicated the incorporation of colloidal AuNMs, whereas colourless beads showed no incorporation of nanoparticles. The stability of the AuNMs in k-CG hydrogels was assessed through optical spectrophotometry as shown in Figure 3b–d. Time-dependent absorption spectra were recorded to ascertain any changes

Laser synthesis of nanoparticles in organic solvents – products, reactions, and perspectives

• Theo Fromme,
• Sven Reichenberger,
• Katharine M. Tibbetts and
• Stephan Barcikowski

Beilstein J. Nanotechnol. 2024, 15, 638–663, doi:10.3762/bjnano.15.54

AFM-IR investigation of thin PECVD SiO_x films on a polypropylene substrate in the surface-sensitive mode

• Hendrik Müller,
• Hartmut Stadler,
• Teresa de los Arcos,
• Adrian Keller and
• Guido Grundmeier

Beilstein J. Nanotechnol. 2024, 15, 603–611, doi:10.3762/bjnano.15.51

• correlation between the IR wavelength of the laser and the thermal expansion of the material enables the recording of IR absorption spectra with this technique which correspond to the spectra of bulk IR spectroscopy [2][3][4]. Compared to ATR-FTIR spectroscopy, AFM-IR provides a drastic improvement in terms

Photocatalytic degradation of methylene blue under visible light by cobalt ferrite nanoparticles/graphene quantum dots

• Vo Chau Ngoc Anh,
• Le Thi Thanh Nhi,
• Le Thi Kim Dung,
• Dang Thi Ngoc Hoa,
• Nguyen Truong Son,
• Nguyen Thi Thao Uyen,
• Nguyen Ngoc Uyen Thu,
• Le Van Thanh Son,
• Le Trung Hieu,
• Tran Ngoc Tuyen and
• Dinh Quang Khieu

Beilstein J. Nanotechnol. 2024, 15, 475–489, doi:10.3762/bjnano.15.43

• electrons and holes. These results suggest that the CoFe2O4/GQD nanocomposite is a potential catalyst for methylene blue degradation and various environmental applications. XRD patterns of (a) CF and (b) CF/GQDs. (a) UV–vis absorption spectra of the GQD solution; inset: GQD solution under white light (left

CdSe/ZnS quantum dots as a booster in the active layer of distributed ternary organic photovoltaics

• Gabriela Lewińska,
• Piotr Jeleń,
• Zofia Kucia,
• Maciej Sitarz,
• Łukasz Walczak,
• Bartłomiej Szafraniak,
• Jerzy Sanetra and
• Konstanty W. Marszalek

Beilstein J. Nanotechnol. 2024, 15, 144–156, doi:10.3762/bjnano.15.14

• -transporting layers [24], active absorbing layers, and other components [25][26]. Inorganic quantum dots are considered substitutes for fullerene acceptors. Their biggest advantages are a tunable band gap, various absorption spectra, and comparatively high mobility of carriers [27][28]. The application of

• in the millivolt region. The biggest change in performance concerned the short-circuit current. Conclusion Absorption spectra of the studied QDs indicate the role of a second acceptor (non-fullerene acceptor [62]) in the heterojunction volume. We may also consider QD materials as donors. By

• establish absorption spectra and confirm excited states proven by luminescence. The dispersive spectra of the refractive index and extinction coefficient of nanoshell nanolayers and nanoshell:donor:acceptor composites were also determined. The dopant QDs shifted the extinction maximum toward longer

Properties of tin oxide films grown by atomic layer deposition from tin tetraiodide and ozone

• Kristjan Kalam,
• Peeter Ritslaid,
• Tanel Käämbre,
• Aile Tamm and
• Kaupo Kukli

Beilstein J. Nanotechnol. 2023, 14, 1085–1092, doi:10.3762/bjnano.14.89

• eV binding energy, whereas the peak at 5 eV is not as dominant [28][29][35]. X-ray absorption spectra (Figure 11) were additionally recorded to possibly detect any differences between the samples. The Sn 3d XAS band is constituted by transitions from the 3d core orbital to the unoccupied p and f

A visible-light photodetector based on heterojunctions between CuO nanoparticles and ZnO nanorods

• Doan Nhat Giang,
• Nhat Minh Nguyen,
• Duc Anh Ngo,
• Thanh Trang Tran,
• Le Thai Duy,
• Cong Khanh Tran,
• Thi Thanh Van Tran,
• Phan Phuong Ha La and
• Vinh Quang Dang

Beilstein J. Nanotechnol. 2023, 14, 1018–1027, doi:10.3762/bjnano.14.84

• JCPDS card No. 01-080-0076. This is proof of the existence of CuO NPs in the CuO NPs/ZnO NRs structure. Figure 2b shows the UV–vis absorption spectra of the pure ZnO NRs and ZnO NRs decorated with CuO NPs. Both samples containing ZnO NRs have absorption edges in a wavelength range from 300 to 380 nm due

• ) characteristics and current–time (I–t) curves (Keithley 2400). Visible detection measurements were performed using LEDs with different wavelengths (395, 464, 532, and 640 nm). FESEM images of (a) pure ZnO NRs and (b) CuO NPs/ZnO NRs; (c) EDS spectrum of CuO NPs/ ZnO NRs. (a) XRD patterns and (b) UV–vis absorption

• spectra of the pure ZnO NRs and CuO NPs/ZnO NRs. (a) I–V characteristics and (b) I–t curves of the photodetector based on CuO NPs/ZnO NRs heterojunctions under 395 nm exposure with different light intensities. I–t curves after three cycles under 395 nm visible-light illumination with two power densities

Nanoarchitectonics of photothermal materials to enhance the sensitivity of lateral flow assays

• Elangovan Sarathkumar,
• Rajasekharan S. Anjana and
• Ramapurath S. Jayasree

Beilstein J. Nanotechnol. 2023, 14, 988–1003, doi:10.3762/bjnano.14.82

• to CC BY 4.0.). Comparison of absorption spectra of different sizes Au-nanorods (C). Maximum temperature raising profile with respect to absorption cross-section of Au-nanorods (D). (Figure 5C and D was reproduced from [48] (© 2022 J.-P. Sun et al., published by Elsevier, distributed under the terms

Isolation of cubic Si₃P₄ in the form of nanocrystals

• Polina K. Nikiforova,
• Sergei S. Bubenov,
• Vadim B. Platonov,
• Andrey S. Kumskov,
• Nikolay N. Kononov,
• Tatyana A. Kuznetsova and
• Sergey G. Dorofeev

Beilstein J. Nanotechnol. 2023, 14, 971–979, doi:10.3762/bjnano.14.80

• agglomeration for at least a month. The synthesized samples were brown powders that formed brown sols in acetonitrile, quite similar in appearance to those of Si NPs. Upon examination of the UV–vis absorption spectra, a bandgap of 1.25 eV was established using Tauc plot (Figure 5). A simpler approach for a

Upscaling the urea method synthesis of CoAl layered double hydroxides

• Camilo Jaramillo-Hernández,
• Víctor Oestreicher,
• Martín Mizrahi and
• Gonzalo Abellán

Beilstein J. Nanotechnol. 2023, 14, 927–938, doi:10.3762/bjnano.14.76

• , P2, S1, and S2, respectively. UV–vis absorption spectra of the solid samples were recorded in reflectance mode employing a Jasco V-670 spectrometer. Thermogravimetric analysis (TGA) was carried out on a Netzsch TG 209 F1 Libra instrument in the 30–900 °C temperature range. Magnetic data were

Silver-based SERS substrates fabricated using a 3D printed microfluidic device

• Phommachith Sonexai,
• Minh Van Nguyen,
• Bui The Huy and
• Yong-Ill Lee

Beilstein J. Nanotechnol. 2023, 14, 793–803, doi:10.3762/bjnano.14.65

• , TESCAN). A UV–vis spectrometer (Agilent 8453, Agilent, USA) and a micro-Raman spectrometer (NS200, Nanoscope System, Republic of Korea) were used to record the absorption spectra and Raman spectra, respectively. Fabrication of the droplet-based microfluidic device The fabrication process of the

Silver nanoparticles loaded on lactose/alginate: in situ synthesis, catalytic degradation, and pH-dependent antibacterial activity

• Nguyen Thi Thanh Tu,
• T. Lan-Anh Vo,
• T. Thu-Trang Ho,
• Kim-Phuong T. Dang,
• Van-Dung Le,
• Phan Nhat Minh,
• Chi-Hien Dang,
• Vinh-Thien Tran,
• Van-Su Dang,
• Tran Thi Kim Chi,
• Hieu Vu-Quang,
• Radek Fajgar,
• Thi-Lan-Huong Nguyen,
• Van-Dat Doan and
• Thanh-Danh Nguyen

Beilstein J. Nanotechnol. 2023, 14, 781–792, doi:10.3762/bjnano.14.64

• . Subsequently, AgNPs@Lac/Alg was characterized using various analytical techniques and applied for the catalytic degradation of contaminants and in bacterial activity assays. Absorption spectra were analyzed to monitor changes in physicochemical properties at the maximum peak region of surface plasmon resonance

Metal-organic framework-based nanomaterials as opto-electrochemical sensors for the detection of antibiotics and hormones: A review

• Akeem Adeyemi Oladipo,
• Saba Derakhshan Oskouei and
• Mustafa Gazi

Beilstein J. Nanotechnol. 2023, 14, 631–673, doi:10.3762/bjnano.14.52

• states produced by this method are “charge-separated” states. The emission and absorption spectra make it simple to discriminate between PET and ICT. Although there is a significant quenching of luminescence intensity in PET, there is no visible spectral shift. Contrarily, ICT yields environment

SERS performance of GaN/Ag substrates fabricated by Ag coating of GaN platforms

• Magdalena A. Zając,
• Bogusław Budner,
• Malwina Liszewska,
• Bartosz Bartosewicz,
• Łukasz Gutowski,
• Jan L. Weyher and
• Bartłomiej J. Jankiewicz

Beilstein J. Nanotechnol. 2023, 14, 552–564, doi:10.3762/bjnano.14.46

• absorption spectra of the GaN platform and the GaN/Ag SERS substrates fabricated using MS and PLD at different temperatures are shown in Figure 5. The spectrum of GaN shows the typical spectral shape of a broadband semiconductor with an absorption edge around 365 nm (3.4 eV). The spectra of all GaN/Ag

A mid-infrared focusing grating coupler with a single circular arc element based on germanium on silicon

• Xiaojun Zhu,
• Shuai Li,
• Ang Sun,
• Yongquan Pan,
• Wen Liu,
• Yue Wu,
• Guoan Zhang and
• Yuechun Shi

Beilstein J. Nanotechnol. 2023, 14, 478–484, doi:10.3762/bjnano.14.38

• is called “fingerprint spectrum region” (FSR) [1][4]. Many small biological molecules have unique and identifiable absorption spectra in the MIR band of 6–15 μm [1][5]. It is of great application value to develop photonic biosensors in this FSR. The spectral transparency window of germanium can fully