Composition PbO Research Articles

Gamma irradiation effects on photoluminescence and semiconducting properties of non-conventional heavy metal binary PbO–Bi2O3 glasses

Non-conventional heavy metal oxide glasses have attracted great interest owing to their unique optical properties and their radiation shielding behavior. Non-conventional glasses of main chemical composition (100 − x) PbO–xBi2O3 where x = 35, 30, 25, 20, 15, 10, and 5 were prepared through the conventional melting and annealing approach. X-ray diffraction measurements denoted the amorphous nature of the prepared glasses. The optical absorption in the UV–visible range recorded strong UV-near visible absorption spectra that correlated to trivalent Bi3+ ions. The optical band gap Eopt, Urbach energy ∆E, and the refractive index were identified for the prepared glasses employing the cognizant theories. The variations in the optical parameters have been associated with the increasing Bi2O3 and the doses of γ- irradiation. The photoluminescent properties of the prepared non-conventional binary Bi2O3–PbO glasses were recorded in the visible range after UV excitation and the color coordinates are located and distributed in the hue violet degree. FT-IR spectroscopic measurements before and after gamma irradiation were applied to investigate the structural changes in the binary heavy metal PbO–Bi2O3 glasses. FTIR data specified that the glass network is composed of different structural building units from BiO3/BiO6 and PbO3/PbO4 depending on the addition ratio between PbO and Bi2O3.

Impact of aluminum fluoride addition on crystallization, structure and thermal properties of lead borate glasses

The glass composition (70-x)PbO–(30-y)B2O3–(x+y)AlF3, where x and y ranges from 0 to 20 mol%, were prepared using the conventional melt-quenching-annealing technique. The structural and thermal properties of the glasses were comprehensively analyzed using techniques like Differential Thermal Analysis (DTA), Dilatometry, Fourier-Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). XRD confirmed the amorphous, non-crystalline structure of the glasses. The glass network was found to be composed of structural units such as PbO4, BO4, BO3 and AlO6 using FTIR spectroscopy. FTIR analysis revealed significant structural changes, including the transformation of BO4 to BO3 units and the increase in non-bridging bonds, particularly with higher AlF3 content. DTA was instrumental in determining characteristic temperatures, such as the glass transition, melting, and peak crystallization temperatures, along with glass stability parameters (∆T, Hr, Tgr) for all samples. The study found that the addition of AlF3 led to a decrease in these characteristic temperatures when replacing B2O3, but an increase when replacing PbO. Variations in the density and thermal expansion of the lead borate glass were observed upon the addition of AlF3, decreasing when substituting for PbO and increasing when substituting for B2O3. These findings provide insights into the properties of oxyfluoride glasses, paving the way for future optimization in their composition for varied applications.

The precipitation of PbFe12O19 hard magnetic phase in PbO-SiO2-B2O3-Fe2O3 glass-ceramics

The present work is focused on investigating the crystallization process of the hard magnetic PbFe12O19 phase in PbO-SiO2-B2O3-Fe2O3 system. In this regard, different composition of (60-x)PbO-(x)SiO2–15B2O3–25Fe2O3 (x = 0, 10, 20, 30) (mol.%), were melted and quenched in cooled water. The annealing process was done in as-quenched samples in temperature range of 300 to 700 °C for 5 h. According to achieved results, fully glassy structure only formed in 30PbO-30SiO2–15B2O3–25Fe2O3 system and the microstructure of quenched samples in other studied compositions was combination of Fe2O3, Fe3O4 and amorphous phases. The glassy phase in 30PbO-30SiO2–15B2O3–25Fe2O3 system exhibited one-stage crystallization on heating and its crystallization activation energy was estimated to be about 520 kJ/mol. The crystallization process in this system is governed by a three-dimensional diffusion-controlled growth. The highest value of coercivity was achieved of about 1450 Oe in annealed sample at 700 °C for 5 h.

Classification model of glass relics based on decision tree algorithm

In order to assist in the compositional analysis and identification of glass artefacts, to clarify the correlations and differences between the individual chemical components, and to achieve the aim of analyzing the patterns of classification of glass artefacts, a classification model was developed in this paper. The data obtained from the chemical components are first processed accordingly, and then a multiple linear regression model is established to investigate the relationship between each chemical component variable and the variable of weathering, and a few chemical components that are significantly affected by weathering are selected as the basis, and a decision tree model based on a particle swarm algorithm is constructed to investigate the classification pattern and subclasses. The final result is that glass products can be classified into high potassium glass types and lead-barium glass types according to whether the chemical composition PbO content is greater than 6.078. The K-Means classification model was also used to classify three subclasses of high-potassium glass products and five subclasses of lead-barium glass products according to the content of the relevant chemical components.

Physical and spectroscopic properties of PbO –ZnF2 – B2O3 glasses doped with CuO

The glass samples with the chemical composition of PbO − ZnF2 − B2O3: CuO has been prepared by melt quenching technique. All the prepared glass samples exhibits amorphous nature, were confirmed by the X-ray diffraction studies. The density of the glass samples were measured by using Archimedes’ principle. With help of measured densities various physical properties such as average molecular weight (M¯), molar volume, Interatomic distance(ri), dopant ion concentrations (Ni) were calculated by using standard formulas. Optical Absorption spectra studies reveals that the glass samples contains Cu ions exhibits a broad absorption band at about 780 nm due to 2B1g→2B2g transition.The spectra of Infrared transmission show prominent bands at wave numbers around 1200 to 1400 cm−1, which are caused by the trigonal BO3 units, at 1000 and 1200 cm-1which are caused by vibrations of BO4 structural units, and at about 700 cm−1 which are caused by B-O-B linkages.

Gamma radiation shielding properties of recycled polyvinyl chloride composites reinforced with micro/nano-structured PbO and CuO particles

In this work, the γ-ray shielding characteristics of fabricated recycled polyvinyl chloride (rPVC) loaded with micro and nano fillers of PbO and CuO composites were investigated. The PbO/rPVC and CuO/rPVC composites were prepared by changing the percentage of injected materials (PbO and CuO) between 10% and 40% with additions by 10%. Gamma-ray attenuation properties, such as mass attenuation coefficients, linear attenuation coefficients and half-value layer for PbO and CuO-supported polymers were obtained in the energy range between 59.5 and 1408.0 keV using narrow beam transmission geometry. These experiments were carried out by using a HPGe detector and five standard radioactive sources [241Am, 133Ba, 137Cs, 60Co and 152Eu]. Moreover, equivalent atomic numbers and the exposure buildup factor (EBF) values for incident photon energy in the range from 0.015 MeV to 15 MeV were also calculated by Geometric Progression (G-P) method. The experimental results revealed that, the measured values of the linear attenuation coefficients of the PbO/rPVC and CuO/rPVC composites showed their dependence on the type and the concentration of the filler (either PbO or CuO) and also on the incident gamma ray energy. Increasing the filler weight fractions wt.% in the rPVC matrix, increases the linear attenuation coefficients of the composite and the improvement is more significant in case of PbO compared to CuO of the same filler wt.% at the same energy. The results also demonstrated an enhancement in the radiation protection behavior of rPVC composites due to the addition of PbO and CuO fillers as nano-sized particles.

Role of interfacial adhesion and fiber length on the mechanical performance fiber reinforced thermoplastic elastomers

Thermoplastic elastomers combine inherent benefits such as the processability and recyclability of thermoplastics and the elasticity, toughness, and flexibility of elastomers. In this work, polyester based thermoplastic elastomers have been reinforced with carbon and poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibers of similar strength and stiffness. Testing of the respective mechanical properties revealed that the PBO reinforced composites yielded higher tensile strength. Single fiber pullout testing was also performed to evaluate the respective interfacial and mechanical properties where it was found that the apparent interfacial shear strength for carbon fibers was two to three times greater than their PBO counterparts. Further analysis revealed that the fiber length of the PBO composites was much greater than for carbon fiber, resulting in superior strength of the PBO reinforced elastomers.

Insight on the weak hopping conduction produced by titanium ions in the lead borate glassy system

DC conductivity investigation was conducted on the lead borate glass system of the composition (75–x) PbO–25B2O3–xTiO2, x = 15, 20, 25, and 30 mol %, to access the potential conduction mechanism controlling the conductivity data of the present glass system. The melt quenching method was utilized to prepare this glassy system. The amorphous nature of the present glass system was asserted by SEM. The theoretical density of the present glass system was larger than the corresponding measured one, affirming the completely amorphous essence of these glasses. The conductivity of these glasses slightly increased with TiO2 additions. Strikingly, when the Pb-ions become attached to Ti-ions in the glass matrix they minimize their hopping motions, leading to the occurrence of the weak hopping process in these glasses. Accordingly, PbO played a vital role in revealing the weak hopping without needing low-temperature measurements close to absolute temperature. The conduction mechanism in these glasses was determined by different models arising from the typical hopping of charge carriers. The polarons hopping occurred in the non-adiabatic process. The values of different parameters, such as small polaron coupling and hopping carrier mobility, asserted the occurrence of the weak hopping process in these glasses. The Greaves VRH model was proper to elucidate the conductivity data of these glasses.

Tailoring Dy3+/Tb3+-doped lead telluride borate glasses for gamma-ray shielding applications

Glass–ceramics of composition (39.5–x) PbO–20 B2O3–20 TeO2–20 MgO–0.5 Dy2O3–x Tb2O3 (where x = 0, 0.5, 1, 1.5, 2, and 2.5 mol%) have been prepared by controlled heat treatment. XRD confirms the crystalline phases present in the network. The structural and vibrational bonds present in the network structure were estimated using the FTIR technique. The band-gap values for the direct and indirect decrease from 3.209 to 3.025 eV and 3.006 to 2.637 eV as terbium concentration increases. The gamma-ray shielding features for the fabricated samples were examined with the help of the MCNP5 code. The relative difference between the linear attenuation coefficients (LAC) obtained by MCNP5, and validated by XCOM, is less than 6%. The addition of Tb2O3 affects the LAC values, especially at the lower energies (0.347 and 0.662 MeV), where a notable decrease in the LAC was recorded as more Tb2O3 was added to the glasses. For the TNNS0-TNNS2.5 glasses, and with the simulated LAC's help, we reported the half-value layer (HVL). For all six of the prepared TNNS0.0–TNNS2.5 glasses, HVL positively correlated with energy. For TNNS0.5, its HVL increased from 0.3770 cm at 0.284 MeV, to 0.9929 cm at 0.511 MeV, 1.6241 cm at 0.826 MeV, and 2.367 cm at 1.332 MeV. From the HVL results, we found that when using these glasses to absorb low energy radiation, a smaller thickness is required to properly absorb most of the photons, while a much greater thickness is required in high energy applications. The ratio between the HVL of TNNS0.0 and TNNS0.5 glasses was calculated. The HVL ratio between TNNS0.0 and TNNS2.5 was also calculated to understand the glass composition's effect on the HVL values. In both cases, the ratios at all energies were greater than one, which means that TNNS0.0 has the greatest HVL at all energies. These results prove that TNNS0 has the greatest potential in radiation-shielding applications, as a lower HVL signifies a better shield, while TNN2.5 has the least potential. The transmission factor (TF) of the investigated glasses at four different thicknesses and four energies was examined. The results revealed that its TF decreases as the thickness of the glass increases for anyone glass, which proves that increasing the thickness of the glasses improves their shielding ability.

The preparation and characterization of silicon-based composites doped with BaSO4, WO3, and PbO nanoparticles for shielding applications in PET and nuclear medicine facilities

Objective(s): The present study aimed to design new nanoparticle-based shielding materials for photons used in single-photon emission computed tomography and positron emission tomography facilities. Materials and Methods: Initially, the mass attenuation coefficients and half value layer (HVL) of the composites were comprehensively investigated based on a silicon rubber containing various ratios of micro- and nano-barium sulfate (BaSO4), lead oxide (PbO), and tungsten oxide (WO3) particles at 60, 80, 100, 150, 200, 300, 400, 500, and 600 keV photon energies using the MCNP-X6 Monte Carlo (MC) code and WinXCOM software. In the second stage, the composites composed of 10 wt% and 20 wt% WO3 and PbO particles were constructed in a liquid silicone rubber-based matrix. The mass attenuation coefficients and HVL of the designed shields were experimentally assessed using Cs-137 and Am-241 radioactive sources.Results: The particles sizes of PbO and WO3 were within the range of 50-200 nanometers. The MC and measurement results indicated that the linear attenuation coefficients of the composites were augmented with the addition of all the studied nano- and micro-particles. However, the PbO composites had more significant shielding properties compared to the BaSO4 and WO3 composites. Conclusion: According to the results, the nanocomposites had better ability to shield γ-rays at both energies compared to the micro-composites.

Gamma ray shielding behavior of Li2O-doped PbO–MoO3–B2O3 glass system

In this work, five glasses for radiation shielding applications in the composition of (30 + x) PbO–5 MoO3–(25 − x) Li2O–40 B2O3 (where x = 0, 5, 10, 15 and 20 mol%) have been prepared. The density increases from 4.354 to 6.578 g cm−3 and the molar volume decreases from 25.144 to 22.520 cm3 with the replacement of Li2O by PbO. The indirect and direct band gap energies decrease from (2.2870–2.2297) eV and (2.9619–2.8660) eV, respectively, as lead content increases from 30 to 50 mol%. In addition, the refractive index of the samples lies between 2.6214 and 2.6429. Geant4 simulation code has been used to evaluate the gamma photon transmission through the prepared samples. Pb50Li5 sample has lower transmission fraction among the studied glasses. For the 2-cm glass thickness, the transmission fraction of Pb30Li25 sample was found to be 0.433 while at the same thickness the transmission fraction of Pb50Li5 sample is 0.265. At 1173 keV, the HVL values were found to be 1.752 cm for Pb50Li5 and 2.693 cm for Pb30Li25 glasses. At the same photon energy, the MFP values were calculated to be 2.529 cm and 3.886 cm for the Pb50Li5 and Pb30Li25 samples, respectively. Due to the higher Pb content existing in the Pb50Li5 glass, this glass effectively blocks the gamma rays compared to the other samples.

Rich reddish-orange emitting PBTNAPr glasses for laser applications

Lead borate oxyfluoride glasses containing different amounts of PrF3 with composition PbO–B2O3–TeO2–NaF–AlF3-PrF3 were prepared and characterized for visible and fiber lasers. The amorphous phase and compositional analysis were carried out through powder X-ray diffraction and Fourier transform infrared spectra, respectively. Using the room temperature optical absorption spectra, the spectroscopic properties were determined applying the modified Judd-Ofelt theory. The photoluminescence excitation spectral studies obtained by controlling the emission through Pr3+: 1D2 → 3H4 (604 nm) transition shows prominent excitation band positioned at ~448 nm (3H4 → 3P2). Upon 448 nm excitation, the studied glasses exhibit an intense emission through 1D2 → 3H4 (604 nm) transition along with feeble emissions from 3P1 and 3P0 metastable levels to the inner energy levels. The emission spectra show a shift towards longer wavelengths (called the red-shift) with increase of PrF3 content. The luminescence decay time of 1D2 emission level was found decreased with increase of PrF3 content. The quenching of decay time was assigned to the transfer of energy among the excited Pr3+ ions at relatively higher PrF3 contents. The experimental results show that the studied glasses with 0.1 mol% of PrF3 could be the suitable candidate to design rich reddish-orange emitting lasers.

Comprehensive study on the structural, optical, physical and gamma photon shielding features of B2O3-Bi2O3-PbO-TiO2 glasses using WinXCOM and Geant4 code

Glass samples of titanium-lead bismuth borate with the composition of (60B2O3 – 20Bi2O3 – (20-x)PbO – xTiO2), where 0 ≤ x ≤ 10 wt% labeled as BBPT0.0 (x = 0) to BBPT10.0 (x = 10) were synthesized. The melt quenching technique was used in the preparation. The amorphous character and vibrational groups for all samples were confirmed through XRD and FTIR measurements, respectively. The optical band gap (Eopt), Urbach's energy (Eurbach), and the optical dispersion constants have been determined using UV–Vis spectra. Results reveal that the values of the optical band gap energy exhibit a decrease with the TiO2 concentration, in contrast with Urbach's energy which displays a linear increase from 0.43 to 0.64 eV. In addition, the values of single-oscillator energy (Eo) has the same behavior of the optical energy gap (Eopt), while the dispersion energy parameter (Ed) has an inversely behavior. Mass attenuation coefficients (μ/ρ) of the investigated glasses have been computed using the Geant4 simulation toolkit and WinXCOM database software. Geant4 model of a HPGe detector has been employed to perform the Monte Carlo simulations for the glass samples with five thicknesses from 1 to 3 cm at the gamma ray energies in the range of 356–2510 keV. The transmission fractions as a function of the thickness at 356 keV photon energy for all studied glasses has been performed. Half value layer (HVL) was derived from the μ/ρ values. Results showed the studied glasses have good shielding capability according to their mass attenuation coefficients, transmission fractions and HVL values.

Studies on the structural, optical and radiation shielding properties of (50 – x) PbO – 10 WO3–10 Na2O – 10 MgO – (20 + x) B2O3 glasses

Heavy metal oxide glasses of composition (50 – x) PbO – 10 WO3–10 Na2O – 10 MgO – (20 + x) B2O3 (where x = 0, 5, 10, 15 and 20 mol%) have been fabricated using melt quenching technique. The X-ray diffraction (XRD) spectra confirm the amorphous nature of the glasses. The Fourier Transform Infrared Spectroscopy (FTIR) throws the light on the various structural properties of the glasses. UV – Visible spectra has been recorded in the range 190–1100 nm. The direct and indirect band gap energies increase from 2.695–2.805 eV and 3.126–3.237 eV as percentage of lead decreases. This value of indirect band gap is further used to calculate the other optical parameters such as refractive index, dielectric constant, optical dielectric constant, reflection loss, molar refractivity, metallization and molar polarizability. Besides, the mass attenuation coefficients have been obtained in the energy range of 0.01–10 MeV using MCNPX code and XCOM program. The obtained results are found to be in agreement. These values are further used to calculate the effective atomic numbers and half value layers of the present glasses. All the shielding parameters are found to depend on the chemical composition and energy of the gamma radiations. But the PB50B20 glass sample is found to possess the highest effective atomic number and the lowest value half value layer. The PB50B20 glass sample (contains 50 mol% PbO) owns the best gamma shielding characteristics.

Physical, structural, optical and gamma ray shielding behavior of (20+x) PbO – 10 BaO – 10 Na2O – 10 MgO – (50-x) B2O3 glasses

Glass samples of composition (20 + x) PbO – 10 BaO – 10 Na2O – 10 MgO – (50-x) B2O3 (x = 0, 5, 10, 15 and 20 mol%) have been prepared by melt quenching technique. Density, molar volume, average boron-boron separation, ion concentration, polaron radius, inter-nuclear distance, field strength, oxygen packing density and oxygen molar volume have been determined to study the physical properties of the glasses. The presence of no sharp peak in the XRD spectra confirms the amorphous nature of the glasses. The structural properties of these glasses have been investigated using Fourier Transform Infrared (FTIR) spectroscopic techniques. The direct and indirect band gap energies, refractive index, dielectric constant, optical dielectric constant, molar fraction, reflection loss and metallization have been also investigated from the UV-VIS spectra. Besides, the radiation attenuation features for the prepared glasses have been calculated using XCOM program. The mass attenuation coefficient values and effective atomic numbers are found to increase with an increase in the PbO content. The radiation shielding study revealed that Pb40B30 and Pb20B50 glasses have the lowest and highest values of mean free path and half value layer values. This indicates that the Pb40B30 glass has the highest photon shielding competence.

Wettability assessment of plasma-treated PBO fibers based on thermogravimetric analysis

Changes in the surface wettability of poly(p-phenylene benzobisoxazole) (PBO) fibers were investigated by thermogravimetric analysis (TGA) following an air dielectric barrier discharge (DBD) plasma treatment. The results were then supplemented and confirmed by scanning electron microscopy (SEM), dynamic contact angle analysis (DCAA), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM) measurements. After exposure to the DBD plasma at a pre-determined power level, TGA analysis showed that the residual rates retained by the PBO composites decreased, which meant an increase in the amount of resin coating the PBO fibers in the composites. Observations by SEM confirmed that there was more resin adhering to the treated PBO fibers and the wetting behavior of resin on the fibers was greatly improved. Meanwhile, DCAA for the treated fibers showed a significant enhancement in fiber surface free energy. XPS and AFM were performed in order to reveal any variations in fiber surface activity and surface morphology resulting from the surface treatment. The resulting data showed that increases in oxygen-containing polar groups and surface roughness on the plasma-treated PBO fibers contributed to the above improved wetting behavior. With comprehensive analyses, it was concluded that TGA could be used as a supporting method assessing the surface wettability of PBO fibers before and after air DBD plasma treatment.

Enhanced luminescence behaviour of Eu3+ doped heavy metal oxide telluroborate glasses for Laser and LED applications

Effect on structural and spectroscopic behaviour caused by the replacement of lead cations with the aluminium cations in the Eu3+ doped heavy metal oxide borophosphate glasses have been studied with the chemical composition (55B2O3+19.5TeO2+10K2O+(15−x)PbO+xAl2O3+0.5Eu2O3 (where x=0, 2.5, 5, 7.5, 10, 12.5 and 15 in wt%) prepared by melt quenching technique. The FTIR and Raman spectral studies reveal the presence of various fundamental vibrational units and are used to identify the phonon energy of the title glasses. The positive values of bonding parameter (δ) indicate the formation of covalent bonds between the dopant (Eu3+) and the anions (O2−). Luminescence spectra of all the titled glasses exhibit five emission bands due to the electronic transitions of the trivalent europium ions. The radiative properties such as transition probability (A), stimulated emission cross-section (σpE)and branching ratio (βR) of the various emission transitions of the Eu3+ ions have been estimated using Judd-Ofelt (JO) theory. The characteristic emission was identified through CIE 1931 color chromaticity diagram and McCamy's formula have been used to estimate the correlated color temperature (CCT) using (x,y) chromaticity coordinates. The luminescence decay profile pertaining to the 5D0 metastable state of the Eu3+ ions exhibits single exponential behaviour uniformly for all the titled glasses and the experimental lifetime values were obtained following the curve fitting method.

Graphene/MWNT/Poly(p-phenylenebenzobisoxazole) Multiphase Nanocomposite via Solution Prepolymerization with Superior Microwave Absorption Properties and Thermal Stability

This paper demonstrates both the high-performance microwave absorption properties and the superior thermal stability of graphene/multiwalled carbon nanotubes (MWNTs)/poly(p-phenylenebenzobisoxazole) (PBO) composites synthesized via in situ polymerization of functionalized PBO precursor with graphene oxide/MWNTs nanocomposites, followed by high-temperature calcination. The incorporation of three-dimensional graphene/MWNTs network significantly improved the reflection loss of PBO composites (−50.17 dB at 12.58 GHz) by over 20 times than that of pure PBO (−2.33 dB at 12.58 GHz) with a sample thickness of only 2.6 mm. The effect of graphene/MWNTs content on the microwave absorption performance was also investigated. The graphene/MWNTs/PBO composite shows great promise as a microwave absorber in high-temperature environments.

Spectroscopic and structural properties of Cr3+ ions in lead niobium germanosilicate glasses

Glasses of composition PbO–Nb2O5–GeO2–SiO2 doped with different concentrations of Cr2O3 (ranging from 0 to 0.5mol%) were prepared by conventional melt quenching technique. The prepared glasses were characterized by X-ray diffraction (XRD). Spectroscopic studies viz., optical absorption, EPR, FTIR, Raman and photoluminescence were carried out on these glasses. The optical absorption spectra exhibited three bands at about 646, 674 and 711nm which are the characteristic bands of octahedral Cr3+ ions. From the analysis of the absorption spectra the crystal field splitting parameters Dq, B and nephelauxetic parameters (β and h) were evaluated. The EPR spectra exhibited two resonance signals at g≈1.97 and g≈4.84. FTIR and Raman spectra have revealed the increasing presence of GeO6 and NbO6 structural units in the glass network with increasing the concentration of Cr2O3 in the glass network. Photoluminescence spectra exhibited a broad emission band in the wavelength region 600 to 850nm with a meta center at about 680nm which is also a characteristic of Cr3+ ions. Correlating optical and EPR data the molecular bonding coefficient parameter (α) has been evaluated. The quantitave correlation and analysis of all the results indicated that the glasses doped with higher content of Cr2O3 are efficient luminescence materials.

A Facile Route to Synthesize Nanographene Reinforced PBO Composites Fiber via in Situ Polymerization.

The polymer matrix with introduced carbon-based nanofiber displays fascinating properties. They have inspired extensive research on the synthesis of polymer composites, which have been applied in catalysis, electronics, and energy storage. In this report, we reported a facile and efficient method to prepare poly(p-phenylene benzobisoxazole) (PBO)/nanographene (PNG) composites fibers via in-situ polymerization, accompanied by the reduction from (nanographene oxide) NGO to (nanographene) NG. By tuning the ratio of feeding PBO monomer to NGO, various composites fibers with 0.1–1 wt % contents of NG were obtained. The efficient PBO chains grafting made NG uniformly disperse in the PBO matrix, and it also increased the uniformity of the packing orientation of PBO chains. Consequently, the tensile strength, tensile modulus, and thermal stability of the obtained PNG composites fibers had been improved significantly. In addition, the composites fibers with 0.5 wt % NG exhibited a 25% increment in tensile strength, and a 41% enhancement in tensile modulus compared with neat PBO fibers. It reveals an excellent reinforcement to PBO composites fibers with NG.