Customized Cellulose Fiber Paper Enabled by an In Situ Growth of Ultralong Hydroxyapatite Nanowires

Abstract

Cellulose fiber (CF) paper is a low-cost, sustainable, and flexible substrate, which has gained increasing interest recently. Before practical usage, the functionalization of the pristine CF paper is indispensable to meet requirements of specific applications. Different from conventional surface modification or physical mixing methods, we report in situ growth of ultralong hydroxyapatite nanowires (HAPNWs) with lengths larger than 10 μm on the CF paper. HAPNWs are radially aligned on the surface of CFs, creating a micro/nanoscale hierarchical structure. By means of the excellent ion exchange ability of HAP and the hierarchical structure, the functions of the CF paper can be easily customized. As a proof-of-concept, we demonstrate two kinds of functional CF paper: (1) the photoluminescent CF paper by doping Eu3+ and Tb3+ ions into the crystal lattice of HAPNWs and (2) the superhydrophobic CF paper by coating poly­(dimethylsiloxane) on the HAPNW hierarchical structure, which can be applied for self-cleaning and oil/water separation. It is expected that an in situ growth of ultralong HAPNWs will provide an instructive guideline for designing a CF paper with specific functions.

Hydroxyapatite Coated with Co-Based Metal Organic Framework Nanoparticles as Heterojunctions for Catalytic Degradation of Organics

“…5 Furthermore, HA nanowires (HAnWs) were paid more attention because of their better flexibility and specific surface area. Some HAnW-based functional materials, such as the salt-resistant Janus evaporator, 6 scaffold for the repairing cartilage defect, 7 cellulose fiber paper, 8 and magnetic paper for oil−water separation, 9 were reported. Its functions and applications should be further expanded.…”

The gorgeous transformation of paper: from cellulose paper to inorganic paper to 2D paper materials with multifunctional properties

“…Recently, Chen and co-workers 275 reported a new type of hydroxyapatite nanowire–cellulose fiber (HAPNW–CF) paper via the in situ growth of ultralong HAP nanowires (HAPNWs) on CF paper (Fig. 13i).…”

A Target-Driven Self-Feedback Paper-Based Photoelectrochemical Sensing Platform for Ultrasensitive Detection of Ochratoxin A with an In2S3/WO3 Heterojunction Structure

“…Nowadays, newly emerging microfluidic paper-based analytical devices (μPAD), with merits of multifunctionality, satisfactory bendability, and admirable biocompatibility, have achieved enormous progress in the fields of manufacturing environment, clinical diagnostics, and so forth. − Among them, paper-based photoelectrochemical (PEC) bioassay, combining plenty of excellent performances of PEC bioanalysis and cellulose paper, has attracted extensive attention because of its portability, high sensitivity, and low background. − In the quest for effectively improving PEC performance, ideal photoactive materials, as one of the most complicated and crucial factors, have been actively pursued among the field. , Tungsten trioxide (WO 3 ) is seen as a promising n-type semiconductor owing to its attractive features including high carrier mobility, wide-range spectral absorption, and eminent chemical stability, − which exhibits great potential to be an excellent photoactive material. However, the application of unmodified WO 3 is restricted due to the weakness of its wide band gap of 2.6–2.8 eV and the high recombination rate of electron–hole pairs, which hinders the efficient conversion from photo to electricity. , Therefore, selecting a sensitizer with prominent sensitization efficiency for WO 3 is critical to accelerate the photo-electric conversion.…”